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3.70711C3.90237 3.31658 3.90237 2.68342 4.29289 2.29289C4.68342 1.90237 5.31658 1.90237 5.70711 2.29289L10.7071 7.29289Z"></path></svg></div></div></li><li class="css-13svt41"><div class="css-1sg2lsz"><img src="/docs/assets/img/icons/sidebar/admin-new.svg" alt="Server administration v4.4 icon" class="css-1m34rt5"/><div class="css-10tjyd0">Server administration v4.4</div><div size="24" color="#333" class="css-1vlg0km"><svg role="img" focusable="false" viewBox="0 0 16 16" aria-label="Arrow Right" fill="currentColor" xmlns="http://www.w3.org/2000/svg" class="css-bleycz"><path d="M10.7071 7.29289C11.0976 7.68342 11.0976 8.31658 10.7071 8.70711L5.70711 13.7071C5.31658 14.0976 4.68342 14.0976 4.29289 13.7071C3.90237 13.3166 3.90237 12.6834 4.29289 12.2929L8.58579 8L4.29289 3.70711C3.90237 3.31658 3.90237 2.68342 4.29289 2.29289C4.68342 1.90237 5.31658 1.90237 5.70711 2.29289L10.7071 7.29289Z"></path></svg></div></div></li><li class="css-13svt41"><div class="css-1sg2lsz"><img src="/docs/assets/img/icons/sidebar/admin-new.svg" alt="Server administration v4.3 icon" class="css-1m34rt5"/><div class="css-10tjyd0">Server administration v4.3</div><div size="24" color="#333" class="css-1vlg0km"><svg role="img" focusable="false" viewBox="0 0 16 16" aria-label="Arrow Right" fill="currentColor" xmlns="http://www.w3.org/2000/svg" class="css-bleycz"><path d="M10.7071 7.29289C11.0976 7.68342 11.0976 8.31658 10.7071 8.70711L5.70711 13.7071C5.31658 14.0976 4.68342 14.0976 4.29289 13.7071C3.90237 13.3166 3.90237 12.6834 4.29289 12.2929L8.58579 8L4.29289 3.70711C3.90237 3.31658 3.90237 2.68342 4.29289 2.29289C4.68342 1.90237 5.31658 1.90237 5.70711 2.29289L10.7071 7.29289Z"></path></svg></div></div></li><li class="css-13svt41"><div class="css-1sg2lsz"><img src="/docs/assets/img/icons/sidebar/admin-new.svg" alt="Server administration v4.2 icon" class="css-1m34rt5"/><div class="css-10tjyd0">Server administration v4.2</div><div size="24" color="#333" class="css-1vlg0km"><svg role="img" focusable="false" viewBox="0 0 16 16" aria-label="Arrow Right" fill="currentColor" xmlns="http://www.w3.org/2000/svg" class="css-bleycz"><path d="M10.7071 7.29289C11.0976 7.68342 11.0976 8.31658 10.7071 8.70711L5.70711 13.7071C5.31658 14.0976 4.68342 14.0976 4.29289 13.7071C3.90237 13.3166 3.90237 12.6834 4.29289 12.2929L8.58579 8L4.29289 3.70711C3.90237 3.31658 3.90237 2.68342 4.29289 2.29289C4.68342 1.90237 5.31658 1.90237 5.70711 2.29289L10.7071 7.29289Z"></path></svg></div></div></li><li class="css-13svt41"><div class="css-1sg2lsz"><img src="/docs/assets/img/icons/sidebar/admin-new.svg" alt="Server administration v4.1 icon" class="css-1m34rt5"/><div class="css-10tjyd0">Server administration v4.1</div><style data-emotion-css="nnsjfc">.css-nnsjfc{padding:0.25rem;-webkit-transition:-webkit-transform 0.2s ease;-webkit-transition:transform 0.2s ease;transition:transform 0.2s ease;-webkit-transform:rotate(90deg);-ms-transform:rotate(90deg);transform:rotate(90deg);}</style><style data-emotion-css="a2qlhg">.css-a2qlhg{width:24px;height:24px;min-width:24px;color:#333;padding:0.25rem;-webkit-transition:-webkit-transform 0.2s ease;-webkit-transition:transform 0.2s ease;transition:transform 0.2s ease;-webkit-transform:rotate(90deg);-ms-transform:rotate(90deg);transform:rotate(90deg);}</style><div size="24" color="#333" class="css-a2qlhg"><svg role="img" focusable="false" viewBox="0 0 16 16" aria-label="Arrow Right" fill="currentColor" xmlns="http://www.w3.org/2000/svg" class="css-bleycz"><path d="M10.7071 7.29289C11.0976 7.68342 11.0976 8.31658 10.7071 8.70711L5.70711 13.7071C5.31658 14.0976 4.68342 14.0976 4.29289 13.7071C3.90237 13.3166 3.90237 12.6834 4.29289 12.2929L8.58579 8L4.29289 3.70711C3.90237 3.31658 3.90237 2.68342 4.29289 2.29289C4.68342 1.90237 5.31658 1.90237 5.70711 2.29289L10.7071 7.29289Z"></path></svg></div></div><style data-emotion-css="i6zvb9">.css-i6zvb9{list-style-type:none;}</style><ul class="css-i6zvb9"><style data-emotion-css="1n64q0m">.css-1n64q0m{margin-top:16px;}</style><div class="subSection css-1n64q0m"><style data-emotion-css="4h1kga">.css-4h1kga{color:#555555;display:inline-block;font-size:13px;font-weight:500;-webkit-letter-spacing:0.5px;-moz-letter-spacing:0.5px;-ms-letter-spacing:0.5px;letter-spacing:0.5px;margin:0.5rem 0 0 1rem;text-transform:uppercase;}.css-4h1kga a{-webkit-text-decoration:none;text-decoration:none;color:#555555;font-size:12px;}.css-4h1kga a:hover{color:#27a0b6;}</style><div class="css-4h1kga">Server v4.1 overview</div><ul class="css-i6zvb9"><style data-emotion-css="7cjp2v">.css-7cjp2v{margin-top:0.5rem;}.css-7cjp2v svg{fill:#555555;}.css-7cjp2v:hover svg{fill:#0062b0;}</style><li class="css-7cjp2v"><span><a data-testid="link" href="/docs/server/v4.1/overview/circleci-server-overview/" class="css-x7gnkn"><style data-emotion-css="1ouqygm">.css-1ouqygm{color:inherit;margin:0 0 0 1rem;display:inline-block;margin-left:30px;font-weight:400;font-size:0.875rem;-webkit-text-decoration:none;text-decoration:none;}.css-1ouqygm:hover{color:#0062b0;}</style><span class="css-1ouqygm">CircleCI server v4.1 overview</span></a></span></li><li class="css-7cjp2v"><span><a data-testid="link" href="/docs/server/v4.1/overview/release-notes/" class="css-x7gnkn"><style data-emotion-css="8bro8e">.css-8bro8e{color:#555555;margin:0 0 0 1rem;display:inline-block;margin-left:30px;font-weight:400;font-size:0.875rem;-webkit-text-decoration:none;text-decoration:none;}.css-8bro8e:hover{color:#0062b0;}</style><span class="css-8bro8e">Release notes</span></a></span></li></ul></div><div class="subSection css-1n64q0m"><div class="css-4h1kga">Server v4.1 installation</div><ul class="css-i6zvb9"><li class="css-7cjp2v"><span><a data-testid="link" href="/docs/server/v4.1/installation/phase-1-prerequisites/" class="css-x7gnkn"><span class="css-8bro8e">Phase 1 - Prerequisites</span></a></span></li><li class="css-7cjp2v"><span><a data-testid="link" href="/docs/server/v4.1/installation/phase-2-core-services/" class="css-x7gnkn"><span class="css-8bro8e">Phase 2 - Core</span></a></span></li><li class="css-7cjp2v"><span><a data-testid="link" href="/docs/server/v4.1/installation/phase-3-execution-environments/" class="css-x7gnkn"><span class="css-8bro8e">Phase 3 - Execution</span></a></span></li><li class="css-7cjp2v"><span><a data-testid="link" href="/docs/server/v4.1/installation/phase-4-post-installation/" class="css-x7gnkn"><span class="css-8bro8e">Phase 4 - Post-installation</span></a></span></li><li class="css-7cjp2v"><span><a data-testid="link" href="/docs/server/v4.1/installation/hardening-your-cluster/" class="css-x7gnkn"><span class="css-8bro8e">Hardening your cluster</span></a></span></li><li class="css-7cjp2v"><span><a data-testid="link" href="/docs/server/v4.1/installation/installing-server-behind-a-proxy/" class="css-x7gnkn"><span class="css-8bro8e">Installing server behind a proxy</span></a></span></li><li class="css-7cjp2v"><span><a data-testid="link" href="/docs/server/v4.1/installation/upgrade-server/" class="css-x7gnkn"><span class="css-8bro8e">Upgrade server v4.x</span></a></span></li><li class="css-7cjp2v"><span><a data-testid="link" href="/docs/server/v4.1/installation/installation-reference/" class="css-x7gnkn"><span class="css-8bro8e">Installation reference</span></a></span></li></ul></div><div class="subSection css-1n64q0m"><div class="css-4h1kga">Air-gapped installation v4.1</div><ul class="css-i6zvb9"><li class="css-7cjp2v"><span><a data-testid="link" href="/docs/server/v4.1/air-gapped-installation/phase-1-prerequisites/" class="css-x7gnkn"><span class="css-8bro8e">Phase 1 - Prerequisites</span></a></span></li><li class="css-7cjp2v"><span><a data-testid="link" href="/docs/server/v4.1/air-gapped-installation/phase-2-configure-object-storage/" class="css-x7gnkn"><span class="css-8bro8e">Phase 2 - Configure object storage</span></a></span></li><li class="css-7cjp2v"><span><a data-testid="link" href="/docs/server/v4.1/air-gapped-installation/phase-3-install-circleci-server/" class="css-x7gnkn"><span class="css-8bro8e">Phase 3 - Install CircleCI server</span></a></span></li><li class="css-7cjp2v"><span><a data-testid="link" href="/docs/server/v4.1/air-gapped-installation/phase-4-configure-nomad-clients/" class="css-x7gnkn"><span class="css-8bro8e">Phase 4 - Configure Nomad clients</span></a></span></li><li class="css-7cjp2v"><span><a data-testid="link" href="/docs/server/v4.1/air-gapped-installation/phase-5-test-your-installation/" class="css-x7gnkn"><span class="css-8bro8e">Phase 5 - Test installation</span></a></span></li><li class="css-7cjp2v"><span><a data-testid="link" href="/docs/server/v4.1/air-gapped-installation/additional-considerations/" class="css-x7gnkn"><span class="css-8bro8e">Additional considerations</span></a></span></li><li class="css-7cjp2v"><span><a data-testid="link" href="/docs/server/v4.1/air-gapped-installation/example-values/" class="css-x7gnkn"><span class="css-8bro8e">Example values.yaml</span></a></span></li></ul></div><div class="subSection css-1n64q0m"><div class="css-4h1kga">Server v4.1 operations</div><ul class="css-i6zvb9"><li class="css-7cjp2v"><span><a data-testid="link" href="/docs/server/v4.1/operator/operator-overview/" class="css-x7gnkn"><span class="css-8bro8e">Operator overview</span></a></span></li><li class="css-7cjp2v"><span><a data-testid="link" href="/docs/server/v4.1/operator/introduction-to-nomad-cluster-operation/" class="css-x7gnkn"><span class="css-8bro8e">Introduction to Nomad cluster operation</span></a></span></li><li class="css-7cjp2v"><span><a data-testid="link" href="/docs/server/v4.1/operator/managing-user-accounts/" class="css-x7gnkn"><span class="css-8bro8e">Managing user accounts</span></a></span></li><li class="css-7cjp2v"><span><a data-testid="link" href="/docs/server/v4.1/operator/managing-orbs/" class="css-x7gnkn"><span class="css-8bro8e">Managing orbs</span></a></span></li><li class="css-7cjp2v"><span><a data-testid="link" href="/docs/server/v4.1/operator/manage-virtual-machines-with-vm-service/" class="css-x7gnkn"><span class="css-8bro8e">Manage virtual machines with VM service</span></a></span></li><li class="css-7cjp2v"><span><a data-testid="link" href="/docs/server/v4.1/operator/configuring-external-services/" class="css-x7gnkn"><span class="css-8bro8e">Configuring external services</span></a></span></li><li class="css-7cjp2v"><span><a data-testid="link" href="/docs/server/v4.1/operator/expanding-internal-database-volumes/" class="css-x7gnkn"><span class="css-8bro8e">Expanding internal database volumes</span></a></span></li><li class="css-7cjp2v"><span><a data-testid="link" href="/docs/server/v4.1/operator/managing-load-balancers/" class="css-x7gnkn"><span class="css-8bro8e">Managing load balancers</span></a></span></li><li class="css-7cjp2v"><span><a data-testid="link" href="/docs/server/v4.1/operator/user-authentication/" class="css-x7gnkn"><span class="css-8bro8e">User authentication</span></a></span></li><li class="css-7cjp2v"><span><a data-testid="link" href="/docs/server/v4.1/operator/managing-build-artifacts/" class="css-x7gnkn"><span class="css-8bro8e">Managing build artifacts</span></a></span></li><li class="css-7cjp2v"><span><a data-testid="link" href="/docs/server/v4.1/operator/usage-data-collection/" class="css-x7gnkn"><span class="css-8bro8e">Usage data collection</span></a></span></li><li class="css-7cjp2v"><span><a data-testid="link" href="/docs/server/v4.1/operator/circleci-server-security-features/" class="css-x7gnkn"><span class="css-8bro8e">CircleCI server security features</span></a></span></li><li class="css-7cjp2v"><span><a data-testid="link" href="/docs/server/v4.1/operator/application-lifecycle/" class="css-x7gnkn"><span class="css-8bro8e">Application lifecycle</span></a></span></li><li class="css-7cjp2v"><span><a data-testid="link" href="/docs/server/v4.1/operator/troubleshooting-and-support/" class="css-x7gnkn"><span class="css-8bro8e">Troubleshooting and support</span></a></span></li><li class="css-7cjp2v"><span><a data-testid="link" href="/docs/server/v4.1/operator/backup-and-restore/" class="css-x7gnkn"><span class="css-8bro8e">Backup and restore</span></a></span></li><li class="css-7cjp2v"><span><a data-testid="link" href="/docs/server/v4.1/operator/upgrade-mongo/" class="css-x7gnkn"><span class="css-8bro8e">Upgrade MongoDB</span></a></span></li><li class="css-7cjp2v"><span><a data-testid="link" href="/docs/server/v4.1/operator/faq/" class="css-x7gnkn"><span class="css-8bro8e">FAQs</span></a></span></li></ul></div></ul></li><li class="css-13svt41"><div class="css-1sg2lsz"><img src="/docs/assets/img/icons/sidebar/plans-outline.svg" alt="Plans and pricing icon" class="css-1m34rt5"/><div class="css-10tjyd0">Plans and pricing</div><div size="24" color="#333" class="css-1vlg0km"><svg role="img" focusable="false" viewBox="0 0 16 16" aria-label="Arrow Right" fill="currentColor" xmlns="http://www.w3.org/2000/svg" class="css-bleycz"><path d="M10.7071 7.29289C11.0976 7.68342 11.0976 8.31658 10.7071 8.70711L5.70711 13.7071C5.31658 14.0976 4.68342 14.0976 4.29289 13.7071C3.90237 13.3166 3.90237 12.6834 4.29289 12.2929L8.58579 8L4.29289 3.70711C3.90237 3.31658 3.90237 2.68342 4.29289 2.29289C4.68342 1.90237 5.31658 1.90237 5.70711 2.29289L10.7071 7.29289Z"></path></svg></div></div></li><li class="css-13svt41"><div class="css-1sg2lsz"><img src="/docs/assets/img/icons/sidebar/changelog.svg" alt="Contributing to CircleCI docs icon" class="css-1m34rt5"/><div class="css-10tjyd0">Contributing to CircleCI docs</div><div size="24" color="#333" class="css-1vlg0km"><svg role="img" focusable="false" viewBox="0 0 16 16" aria-label="Arrow Right" fill="currentColor" xmlns="http://www.w3.org/2000/svg" class="css-bleycz"><path d="M10.7071 7.29289C11.0976 7.68342 11.0976 8.31658 10.7071 8.70711L5.70711 13.7071C5.31658 14.0976 4.68342 14.0976 4.29289 13.7071C3.90237 13.3166 3.90237 12.6834 4.29289 12.2929L8.58579 8L4.29289 3.70711C3.90237 3.31658 3.90237 2.68342 4.29289 2.29289C4.68342 1.90237 5.31658 1.90237 5.70711 2.29289L10.7071 7.29289Z"></path></svg></div></div></li></ul></div></nav><style data-emotion-css="lfzoxb">.css-lfzoxb{padding:3rem 2.5rem 0 2.5rem;}@media (max-width:768px){.css-lfzoxb{padding:1.5rem 1rem;}}</style><style data-emotion-css="1xwsbgo">.css-1xwsbgo{box-sizing:border-box;min-width:0;margin:0;display:-webkit-box;display:-webkit-flex;display:-ms-flexbox;display:flex;-webkit-flex-direction:column;-ms-flex-direction:column;flex-direction:column;-webkit-flex-wrap:nowrap;-ms-flex-wrap:nowrap;flex-wrap:nowrap;-webkit-flex:1;-ms-flex:1;flex:1;padding:3rem 2.5rem 0 2.5rem;}@media (max-width:768px){.css-1xwsbgo{padding:1.5rem 1rem;}}</style><main class="css-1xwsbgo"><article> <style data-emotion-css="ha3tto">.css-ha3tto{color:#555555;font-size:1rem;line-height:1.5rem;}.css-ha3tto .circle-green{color:#04aa4e;}.css-ha3tto .circle-red{color:#c13937;}.css-ha3tto p{margin-top:0px;margin-bottom:10px;}.css-ha3tto ol,.css-ha3tto ul{margin-bottom:10px;margin-top:0;}.css-ha3tto .table-striped{margin:1.5rem 0;}.css-ha3tto .table{border-collapse:collapse;border-spacing:0;max-width:100%;width:100%;table-layout:auto;}.css-ha3tto .table thead{background:#F7F7F7;}.css-ha3tto .table th,.css-ha3tto .table td{line-height:1.50;padding:0.5rem;text-align:left;vertical-align:top;}.css-ha3tto .table th{border-bottom:1px solid #E3E3E3;color:#555555;font-weight:500;font-size:1rem;}.css-ha3tto .table tr th:first-of-type code.language-plaintext,.css-ha3tto .table tr td:first-of-type code.language-plaintext{white-space:nowrap !important;}.css-ha3tto .table.table-striped > tbody > tr:nth-of-type(even){background-color:#F7F7F7;}.css-ha3tto 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css-1d1hm3o"><div><div class="sect1"> <div><style data-emotion-css="1gt1ibw">.css-1gt1ibw{color:#161616;line-height:1.50;}</style><div class="css-1gt1ibw"><style data-emotion-css="n6xkmh">.css-n6xkmh{margin-bottom:10px;margin-top:1.25rem;-webkit-scroll-margin-top:100px;-moz-scroll-margin-top:100px;-ms-scroll-margin-top:100px;scroll-margin-top:100px;}</style><style data-emotion-css="sycgw4">.css-sycgw4{box-sizing:border-box;min-width:0;margin:0;color:#161616;font-size:1.75rem;font-weight:700;line-height:1.25;margin-bottom:10px;margin-top:1.25rem;-webkit-scroll-margin-top:100px;-moz-scroll-margin-top:100px;-ms-scroll-margin-top:100px;scroll-margin-top:100px;}</style><h2 id="introduction" data-testid="title-introduction" class="css-sycgw4">Introduction</h2></div></div> <div class="sectionbody"> <div class="paragraph"> <p>CircleCI server is an on-premises CI/CD platform for enterprise customers who have compliance or security needs that require them to operate within their firewall, in a private cloud, or in a data center.</p> </div> <div class="paragraph"> <p>CircleCI server provides the same features as CircleCI’s cloud offering, but operates within your Kubernetes cluster.</p> </div> <style data-emotion-css="bdwfpm">.css-bdwfpm{margin:1.5rem 0;}</style><div class="css-bdwfpm"><style data-emotion-css="l2fvwh">.css-l2fvwh{box-sizing:border-box;min-width:0;margin:0;border:1px solid #D4D4D4;-webkit-align-items:center;-webkit-box-align:center;-ms-flex-align:center;align-items:center;min-height:60px;margin:0.25rem 0;border-left:4px solid #0078CA;}</style><div data-testid="compass-info-alert" role="alert" aria-live="polite" class="css-l2fvwh"><style data-emotion-css="v7m42f">.css-v7m42f{-webkit-flex-wrap:wrap;-ms-flex-wrap:wrap;flex-wrap:wrap;-webkit-column-gap:0.75rem;column-gap:0.75rem;margin:11px;-webkit-align-items:flex-start;-webkit-box-align:flex-start;-ms-flex-align:flex-start;align-items:flex-start;}@media 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focusable="false" viewBox="0 0 24 24" aria-label="Info Circle" fill="currentColor" xmlns="http://www.w3.org/2000/svg" class="css-bleycz"><path d="M12 2C17.52 2 22 6.48 22 12C22 17.52 17.52 22 12 22C6.48 22 2 17.52 2 12C2 6.48 6.48 2 12 2ZM12 6C11.4477 6 11 6.44772 11 7C11 7.55228 11.4477 8 12 8C12.5523 8 13 7.55228 13 7C13 6.44772 12.5523 6 12 6ZM12 10C11.4477 10 11 10.4477 11 11V17C11 17.5523 11.4477 18 12 18C12.5523 18 13 17.5523 13 17V11C13 10.4477 12.5523 10 12 10Z"></path></svg></div><style data-emotion-css="1aoesim">.css-1aoesim{-webkit-column-gap:0.75rem;column-gap:0.75rem;row-gap:0.75rem;-webkit-flex-direction:row;-ms-flex-direction:row;flex-direction:row;-webkit-align-items:center;-webkit-box-align:center;-ms-flex-align:center;align-items:center;-webkit-flex:1;-ms-flex:1;flex:1;}</style><style data-emotion-css="45kv77">.css-45kv77{box-sizing:border-box;min-width:0;margin:0;display:-webkit-box;display:-webkit-flex;display:-ms-flexbox;display:flex;-webkit-flex-direction:row;-ms-flex-direction:row;flex-direction:row;-webkit-flex-wrap:nowrap;-ms-flex-wrap:nowrap;flex-wrap:nowrap;width:100%;-webkit-column-gap:0.75rem;column-gap:0.75rem;row-gap:0.75rem;-webkit-flex-direction:row;-ms-flex-direction:row;flex-direction:row;-webkit-align-items:center;-webkit-box-align:center;-ms-flex-align:center;align-items:center;-webkit-flex:1;-ms-flex:1;flex:1;}</style><div id="collapsible-flex" class="css-45kv77"><style data-emotion-css="seohoz">.css-seohoz{box-sizing:border-box;min-width:0;margin:0;-webkit-flex:1;-ms-flex:1;flex:1;}</style><div class="css-seohoz"><style data-emotion-css="1c1tyii">.css-1c1tyii{box-sizing:border-box;min-width:0;margin:0;color:#161616;font-size:1rem;line-height:1.5;}</style><span class="css-1c1tyii"> <div style="overflow:auto"><table><tbody><tr><td class="icon"> <i class="fa icon-note" title="Note"></i> </td><td class="content"> For installation instructions, you have the option of either the <span><a data-testid="link" href="/docs/server/v4.1/installation/phase-1-prerequisites/" class="css-x7gnkn"> regular</a></span> or <span><a data-testid="link" href="/docs/server/v4.1/air-gapped-installation/phase-1-prerequisites/" class="css-x7gnkn"> air-gapped</a></span> installation guide. </td></tr></tbody></table></div> </span></div><style data-emotion-css="1ng7dzp">.css-1ng7dzp{-webkit-column-gap:0.75rem;column-gap:0.75rem;min-height:36px;}</style><style data-emotion-css="1828gbe">.css-1828gbe{box-sizing:border-box;min-width:0;margin:0;display:-webkit-box;display:-webkit-flex;display:-ms-flexbox;display:flex;-webkit-flex-direction:row;-ms-flex-direction:row;flex-direction:row;-webkit-flex-wrap:nowrap;-ms-flex-wrap:nowrap;flex-wrap:nowrap;-webkit-column-gap:0.75rem;column-gap:0.75rem;min-height:36px;}</style><div class="css-1828gbe">  </div><div class="css-1828gbe">  </div></div></div></div></div> <style data-emotion-css="1anc138">.css-1anc138{text-align:center;font-style:italic;margin:1.5rem 0;}</style><div class="imageblock css-1anc138"> <div class="content"> <style data-emotion-css="105956i">.css-105956i{cursor:-webkit-zoom-in;cursor:-moz-zoom-in;cursor:zoom-in;max-width:100%;margin:0 0 1rem 0;}</style><img src="/docs/assets/img/docs/server-4-architecture-diagram.png" alt="Server v4.x services architecture" data-testid="image" loading="lazy" class="css-105956i"/> </div> <div class="title">Figure 1. CircleCI server v4.x Architecture</div> </div> <div class="paragraph"> <p>The CircleCI server application exposes four services, using a single load balancer. If required, the load balancer can be made private, separating it from the public internet.</p> </div> <div style="overflow:auto"><table class="tableblock frame-all grid-all stripes-even stretch table table-striped"><thead><tr><th class="tableblock halign-left valign-top">Service</th><th class="tableblock halign-left valign-top">Ports</th><th class="tableblock halign-left valign-top">Description</th></tr></thead><tbody><tr><td class="tableblock halign-left valign-top"><p class="tableblock">Frontend GUI Proxy & API</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">80 and 443</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Exposes the web application.</p></td></tr><tr><td class="tableblock halign-left valign-top"><p class="tableblock">Nomad Control Plane</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">4647</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Exposes an RPC protocol for Nomad clients.</p></td></tr><tr><td class="tableblock halign-left valign-top"><p class="tableblock">Output Processor</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">8585</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Ingests output from Nomad runners.</p></td></tr><tr><td class="tableblock halign-left valign-top"><p class="tableblock">VM Service</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">3000</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Provisions virtual machines.</p></td></tr></tbody></table></div> <div class="paragraph"> <p>The application exposes a number of external ports. These ports are used for various functions as defined in the table below.</p> </div> <div style="overflow:auto"><table class="tableblock frame-all grid-all stripes-even stretch table table-striped"><thead><tr><th class="tableblock halign-left valign-top">Port number</th><th class="tableblock halign-left valign-top">Protocol</th><th class="tableblock halign-left valign-top">Direction</th><th class="tableblock halign-left valign-top">Source / Destination</th><th class="tableblock halign-left valign-top">Use</th><th class="tableblock halign-left valign-top">Notes</th></tr></thead><tbody><tr><td class="tableblock halign-left valign-top"><p class="tableblock">80</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">TCP</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Inbound</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">End users</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">HTTP web app traffic</p></td><td class="tableblock halign-left valign-top"></td></tr><tr><td class="tableblock halign-left valign-top"><p class="tableblock">443</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">TCP</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Inbound</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">End users</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">HTTP web app traffic</p></td><td class="tableblock halign-left valign-top"></td></tr><tr><td class="tableblock halign-left valign-top"><p class="tableblock">22</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">TCP</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Inbound</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Administrators</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">SSH</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Only required for the bastion host.</p></td></tr><tr><td class="tableblock halign-left valign-top"><p class="tableblock">64535-65535</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">TCP</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Inbound</p></td><td class="tableblock halign-left valign-top"></td><td class="tableblock halign-left valign-top"><p class="tableblock">SSH into builds</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Only required for the Nomad clients.</p></td></tr></tbody></table></div> <div class="paragraph"> <p>CircleCI server schedules CI jobs using the <span><a href="https://www.nomadproject.io/" target="_blank" rel="noopener noreferrer" data-testid="external-link" class="css-x7gnkn"> Nomad<style data-emotion-css="1ie5e7y">.css-1ie5e7y{display:inline-block;width:1rem;height:1rem;margin-left:-5px;}</style><span color="currentColor" class="css-1ie5e7y"><style data-emotion-css="qzco2h">.css-qzco2h{display:block;width:100%;fill:#0078CA;}</style><svg role="img" focusable="false" viewBox="0 0 24 24" aria-label="New Window Link" data-testid="external-icon" class="css-qzco2h"><path fill-rule="evenodd" d="M9,4 L15,4 L15.0752385,4.00278786 L15.2007255,4.02024007 L15.3121422,4.04973808 L15.4232213,4.09367335 L15.5207085,4.14599544 L15.6170221,4.21292768 L15.7071408,4.29291093 C15.7425006,4.32828725 15.7746868,4.3656744 15.8036651,4.40469337 L15.8753285,4.51593788 L15.9287742,4.62866395 L15.9641546,4.73400701 L15.9932723,4.88337887 L16,5 L16,11 C16,11.5522847 15.5522847,12 15,12 C14.4871642,12 14.0644928,11.6139598 14.0067277,11.1166211 L14,11 L14,7.414 L10.0502525,11.363961 C9.65972827,11.7544853 9.02656329,11.7544853 8.63603899,11.363961 C8.27555502,11.0034771 8.24782547,10.436246 8.55285035,10.0439548 L8.63603895,9.94974748 L12.585,5.999 L9,6 C8.48716416,6 8.06449284,5.61395981 8.00672773,5.11662113 L8,5 C8,4.48716416 8.38604019,4.06449284 8.88337887,4.00672773 L9,4 Z"></path></svg></span></a></span> scheduler. The Nomad control plane runs inside of Kubernetes, while the Nomad clients, which are responsible for running scheduled CircleCI jobs, are provisioned outside the cluster. CircleCI server can run Docker jobs on the Nomad clients themselves or in a dedicated virtual machine (VM).</p> </div> <div class="paragraph"> <p>Job artifacts and outputs are sent directly from jobs in Nomad to object storage (S3, Google Cloud Storage, or other supported options). Audit logs and other items from the application are also stored in object storage, so both the Kubernetes cluster and the Nomad clients need access to object storage.</p> </div> </div> </div> <div class="sect1"> <div><div class="css-1gt1ibw"><h2 id="services" data-testid="title-services" class="css-sycgw4">Services</h2></div></div> <div class="sectionbody"> <div class="paragraph"> <p>CircleCI server v4.x consists of the following services. Find their descriptions and failure implications below:</p> </div> <div style="overflow:auto"><table class="tableblock frame-all grid-all stripes-even stretch table table-striped"><thead><tr><th class="tableblock halign-left valign-top">Service</th><th class="tableblock halign-left valign-top">Component</th><th class="tableblock halign-left valign-top">Description</th><th class="tableblock halign-left valign-top">What happens if it fails?</th><th class="tableblock halign-left valign-top">Notes</th></tr></thead><tbody><tr><td class="tableblock halign-left valign-top"><p class="tableblock"><code class="" data-testid="code-snippet-highlight">api-service</code></p></td><td class="tableblock halign-left valign-top"><p class="tableblock">App Core</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Provides a GraphQL API that provides data to render the web frontend.</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Many parts of the UI (such as Contexts) will fail completely.</p></td><td class="tableblock halign-left valign-top"></td></tr><tr><td class="tableblock halign-left valign-top"><p class="tableblock"><code class="" data-testid="code-snippet-highlight">audit-log-service</code></p></td><td class="tableblock halign-left valign-top"><p class="tableblock">App Core</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Persists audit log events to blob storage for long-term storage.</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Some events may not be recorded.</p></td><td class="tableblock halign-left valign-top"></td></tr><tr><td class="tableblock halign-left valign-top"><p class="tableblock"><code class="" data-testid="code-snippet-highlight">branch-service</code></p></td><td class="tableblock halign-left valign-top"><p class="tableblock">App Core</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">A service responsible for listening to the event stream. Detects branch deletions, job updates, pushes, workflow updates.</p></td><td class="tableblock halign-left valign-top"></td><td class="tableblock halign-left valign-top"></td></tr><tr><td class="tableblock halign-left valign-top"><p class="tableblock"><code class="" data-testid="code-snippet-highlight">builds-service</code></p></td><td class="tableblock halign-left valign-top"><p class="tableblock">App Core</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Ingests from www-api and sends to plans-service, workflows-conductor, and to orbs-service.</p></td><td class="tableblock halign-left valign-top"></td><td class="tableblock halign-left valign-top"></td></tr><tr><td class="tableblock halign-left valign-top"><p class="tableblock"><code class="" data-testid="code-snippet-highlight">circleci-mongodb</code></p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Execution</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Primary datastore</p></td><td class="tableblock halign-left valign-top"></td><td class="tableblock halign-left valign-top"></td></tr><tr><td class="tableblock halign-left valign-top"><p class="tableblock"><code class="" data-testid="code-snippet-highlight">circleci-postgres</code></p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Data storage for microservices.</p></td><td class="tableblock halign-left valign-top"></td><td class="tableblock halign-left valign-top"></td><td class="tableblock halign-left valign-top"></td></tr><tr><td class="tableblock halign-left valign-top"><p class="tableblock"><code class="" data-testid="code-snippet-highlight">circleci-rabbitmq</code></p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Pipelines and Execution</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Queuing for workflow messaging, test results, usage, crons, output, notifications, and scheduler.</p></td><td class="tableblock halign-left valign-top"></td><td class="tableblock halign-left valign-top"></td></tr><tr><td class="tableblock halign-left valign-top"><p class="tableblock"><code class="" data-testid="code-snippet-highlight">circleci-redis</code></p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Execution</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Caches data that will not be stored permanently (such as build logs), for request caching, and for rate limit calculations.</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">A failed cache can result in rate limiting from the VCS if too many calls are made to it.</p></td><td class="tableblock halign-left valign-top"></td></tr><tr><td class="tableblock halign-left valign-top"><p class="tableblock"><code class="" data-testid="code-snippet-highlight">circleci-telegraf</code></p></td><td class="tableblock halign-left valign-top"></td><td class="tableblock halign-left valign-top"><p class="tableblock">Telegraf collects statsd metrics. All white-boxed metrics in our services publish statsd metrics that are sent to Telegraf, but can also be configured to be exported to other places (such as Datadog or Prometheus).</p></td><td class="tableblock halign-left valign-top"></td><td class="tableblock halign-left valign-top"></td></tr><tr><td class="tableblock halign-left valign-top"><p class="tableblock"><code class="" data-testid="code-snippet-highlight">circleci-vault</code></p></td><td class="tableblock halign-left valign-top"></td><td class="tableblock halign-left valign-top"><p class="tableblock">HashiCorp Vault to run encryption and decryption as a service for secrets.</p></td><td class="tableblock halign-left valign-top"></td><td class="tableblock halign-left valign-top"></td></tr><tr><td class="tableblock halign-left valign-top"><p class="tableblock"><code class="" data-testid="code-snippet-highlight">contexts-service</code></p></td><td class="tableblock halign-left valign-top"><p class="tableblock">App Core</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Stores and provides encrypted contexts.</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">All builds using Contexts will fail.</p></td><td class="tableblock halign-left valign-top"></td></tr><tr><td class="tableblock halign-left valign-top"><p class="tableblock"><code class="" data-testid="code-snippet-highlight">cron-service</code></p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Pipelines</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Triggers scheduled workflows.</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Scheduled workflows will not run.</p></td><td class="tableblock halign-left valign-top"></td></tr><tr><td class="tableblock halign-left valign-top"><p class="tableblock"><code class="" data-testid="code-snippet-highlight">dispatcher</code></p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Execution</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Split jobs into tasks and send them to scheduler to run.</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">No jobs will be sent to Nomad. The run queue will increase in size, but there should be no meaningful loss of data.</p></td><td class="tableblock halign-left valign-top"></td></tr><tr><td class="tableblock halign-left valign-top"><p class="tableblock"><code class="" data-testid="code-snippet-highlight">distributor-*</code></p></td><td class="tableblock halign-left valign-top"><p class="tableblock">App Core</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Responsible for accepting build requests and distributing the job to appropriate queues.</p></td><td class="tableblock halign-left valign-top"></td><td class="tableblock halign-left valign-top"></td></tr><tr><td class="tableblock halign-left valign-top"><p class="tableblock"><code class="" data-testid="code-snippet-highlight">domain-service</code></p></td><td class="tableblock halign-left valign-top"><p class="tableblock">App Core</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Stores and provides information about our domain model. Works with permissions and API.</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Workflows will fail to start and some REST API calls may fail, causing 500 errors in the CircleCI UI. If LDAP authentication is in use, all logins will fail.</p></td><td class="tableblock halign-left valign-top"></td></tr><tr><td class="tableblock halign-left valign-top"><p class="tableblock"><code class="" data-testid="code-snippet-highlight">frontend</code></p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Frontend</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">CircleCI web app and www-api proxy.</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">The UI and REST API will be unavailable and no jobs will be triggered by GitHub/Enterprise. Running builds will be OK, but no updates will be seen.</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Rate limit of 150 requests per second with a single user instantaneous limit of 300 requests.</p></td></tr><tr><td class="tableblock halign-left valign-top"><p class="tableblock"><code class="" data-testid="code-snippet-highlight">insights-service</code></p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Metrics</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">A service to aggregate build and usage metrics for exporting and analysis.</p></td><td class="tableblock halign-left valign-top"></td><td class="tableblock halign-left valign-top"></td></tr><tr><td class="tableblock halign-left valign-top"><p class="tableblock"><code class="" data-testid="code-snippet-highlight">kong</code></p></td><td class="tableblock halign-left valign-top"><p class="tableblock">App Core</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">API management.</p></td><td class="tableblock halign-left valign-top"></td><td class="tableblock halign-left valign-top"></td></tr><tr><td class="tableblock halign-left valign-top"><p class="tableblock"><code class="" data-testid="code-snippet-highlight">legacy-notifier</code></p></td><td class="tableblock halign-left valign-top"><p class="tableblock">App Core</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Handles notifications to external services (for example, Slack or email).</p></td><td class="tableblock halign-left valign-top"></td><td class="tableblock halign-left valign-top"></td></tr><tr><td class="tableblock halign-left valign-top"><p class="tableblock"><code class="" data-testid="code-snippet-highlight">nginx</code></p></td><td class="tableblock halign-left valign-top"><p class="tableblock">App Core / Frontend</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Handles traffic redirection and ingress.</p></td><td class="tableblock halign-left valign-top"></td><td class="tableblock halign-left valign-top"></td></tr><tr><td class="tableblock halign-left valign-top"><p class="tableblock"><code class="" data-testid="code-snippet-highlight">nomad-autoscaler</code></p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Nomad</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Manages scaling of Nomad clusters in AWS and GCP environments.</p></td><td class="tableblock halign-left valign-top"></td><td class="tableblock halign-left valign-top"></td></tr><tr><td class="tableblock halign-left valign-top"><p class="tableblock"><code class="" data-testid="code-snippet-highlight">nomad-server</code></p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Nomad</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Responsible for managing Nomad clients.</p></td><td class="tableblock halign-left valign-top"></td><td class="tableblock halign-left valign-top"></td></tr><tr><td class="tableblock halign-left valign-top"><p class="tableblock"><code class="" data-testid="code-snippet-highlight">orb-service</code></p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Pipelines</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Handles communication between orb registry and config.</p></td><td class="tableblock halign-left valign-top"></td><td class="tableblock halign-left valign-top"></td></tr><tr><td class="tableblock halign-left valign-top"><p class="tableblock"><code class="" data-testid="code-snippet-highlight">output-processor</code></p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Execution</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Receives job output and status updates and writes them to MongoDB. Also provides an API to running jobs to access caches, workspaces, store caches, workspaces, artifacts, & test results.</p></td><td class="tableblock halign-left valign-top"></td><td class="tableblock halign-left valign-top"></td></tr><tr><td class="tableblock halign-left valign-top"><p class="tableblock"><code class="" data-testid="code-snippet-highlight">permissions-service</code></p></td><td class="tableblock halign-left valign-top"><p class="tableblock">App Core</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Provides the CircleCI permissions interface.</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Workflows will fail to start and some REST API calls may fail, causing 500 errors in the UI.</p></td><td class="tableblock halign-left valign-top"></td></tr><tr><td class="tableblock halign-left valign-top"><p class="tableblock"><code class="" data-testid="code-snippet-highlight">scheduler</code></p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Execution</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Runs tasks sent to it. Works with Nomad server.</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">No jobs will be sent to Nomad. The run queue will increase in size, but there should be no meaningful loss of data.</p></td><td class="tableblock halign-left valign-top"></td></tr><tr><td class="tableblock halign-left valign-top"><p class="tableblock"><code class="" data-testid="code-snippet-highlight">socketi</code></p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Frontend</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Websockets server.</p></td><td class="tableblock halign-left valign-top"></td><td class="tableblock halign-left valign-top"></td></tr><tr><td class="tableblock halign-left valign-top"><p class="tableblock"><code class="" data-testid="code-snippet-highlight">telegraf</code></p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Metrics</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Collection of metrics.</p></td><td class="tableblock halign-left valign-top"></td><td class="tableblock halign-left valign-top"></td></tr><tr><td class="tableblock halign-left valign-top"><p class="tableblock"><code class="" data-testid="code-snippet-highlight">test-results-service</code></p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Execution</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Parses test result files and stores data.</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">There will be no test failure or timing data for jobs, but this will be back-filled once the service is restarted.</p></td><td class="tableblock halign-left valign-top"></td></tr><tr><td class="tableblock halign-left valign-top"><p class="tableblock"><code class="" data-testid="code-snippet-highlight">vm-gc</code></p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Compute Management</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Periodically checks for stale machine and remote Docker instances and requests that vm-service remove them.</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Old vm-service instances might not be destroyed until this service is restarted.</p></td><td class="tableblock halign-left valign-top"></td></tr><tr><td class="tableblock halign-left valign-top"><p class="tableblock"><code class="" data-testid="code-snippet-highlight">vm-scaler</code></p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Machine</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Periodically requests that vm-service provision more instances for running machine and remote Docker jobs.</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">VM instances for machine and Remote Docker might not be provisioned, causing you to run out of capacity to run jobs with these executors.</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Different overlay for EKS versus GKE.</p></td></tr><tr><td class="tableblock halign-left valign-top"><p class="tableblock"><code class="" data-testid="code-snippet-highlight">vm-service</code></p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Machine</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Inventory of available vm-service instances, and provisioning of new instances.</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Jobs that use machine or remote Docker will fail.</p></td><td class="tableblock halign-left valign-top"></td></tr><tr><td class="tableblock halign-left valign-top"><p class="tableblock"><code class="" data-testid="code-snippet-highlight">web-ui-*</code></p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Frontend</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Micro Front End (MFE) services used to render the frontend web application GUI.</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">The respective services page will fail to load. Example: A <code class="" data-testid="code-snippet-highlight">web-ui-server-admin</code> failure means the server Admin page will fail to load.</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">The MFEs are used to render the web application located at app.<my domain here></p></td></tr><tr><td class="tableblock halign-left valign-top"><p class="tableblock"><code class="" data-testid="code-snippet-highlight">webhook-service</code></p></td><td class="tableblock halign-left valign-top"><p class="tableblock">App Core</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Service responsible for all webhooks, including management of state and handling events.</p></td><td class="tableblock halign-left valign-top"></td><td class="tableblock halign-left valign-top"></td></tr><tr><td class="tableblock halign-left valign-top"><p class="tableblock">workflows-conductor-event-consumer</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Pipelines</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Takes in information from VCS to kick off pipelines.</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">New Pipelines will not be kicked off when there are changes in the VCS.</p></td><td class="tableblock halign-left valign-top"></td></tr><tr><td class="tableblock halign-left valign-top"><p class="tableblock">workflows-conductor-grpc</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Pipelines</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Helps translate the information through gRPC.</p></td><td class="tableblock halign-left valign-top"></td><td class="tableblock halign-left valign-top"></td></tr></tbody></table></div> </div> </div> <div class="sect1"> <div><div class="css-1gt1ibw"><h2 id="platforms" data-testid="title-platforms" class="css-sycgw4">Platforms</h2></div></div> <div class="sectionbody"> <div class="paragraph"> <p>CircleCI server is designed to deploy within a Kubernetes cluster. The virtual machine service (VM Service) is able to leverage unique EKS or GKE offerings to dynamically create VM images.</p> </div> <div class="paragraph"> <p>If installing outside of EKS or GKE, additional work is required to access some of the same machine build features. Setting up CircleCI runner gives you access to the same feature set as VM service across a much wider range of operating systems and machine types (for example, macOS).</p> </div> <div class="paragraph"> <p>We do our best to support a wide range of platforms for installation. We use environment-agnostic solutions wherever possible. However, we do not test all platforms and options. For that reason, we provide a list of tested environments, which we will continue to expand.</p> </div> <div style="overflow:auto"><table class="tableblock frame-all grid-all stripes-even stretch table table-striped"><thead><tr><th class="tableblock halign-left valign-top">Environment</th><th class="tableblock halign-left valign-top">Status</th><th class="tableblock halign-left valign-top">Notes</th></tr></thead><tbody><tr><td class="tableblock halign-left valign-top"><p class="tableblock">EKS</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Tested</p></td><td class="tableblock halign-left valign-top"></td></tr><tr><td class="tableblock halign-left valign-top"><p class="tableblock">GKE</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Tested</p></td><td class="tableblock halign-left valign-top"></td></tr><tr><td class="tableblock halign-left valign-top"><p class="tableblock">Local installation</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Tested</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">See <span><a data-testid="link" href="/docs/server/v4.1/air-gapped-installation/phase-1-prerequisites/" class="css-x7gnkn"> Air-gapped installation</a></span> docs</p></td></tr><tr><td class="tableblock halign-left valign-top"><p class="tableblock">Azure</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Untested</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Should work with MinIO and Runner.</p></td></tr><tr><td class="tableblock halign-left valign-top"><p class="tableblock">Digital Ocean</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Untested</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Should work with MinIO and Runner.</p></td></tr><tr><td class="tableblock halign-left valign-top"><p class="tableblock">OpenShift</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Untested</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Known not to work.</p></td></tr><tr><td class="tableblock halign-left valign-top"><p class="tableblock">Rancher</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Untested</p></td><td class="tableblock halign-left valign-top"><p class="tableblock">Should work with MinIO and Runner.</p></td></tr></tbody></table></div> </div> </div> <div class="sect1"> <div><div class="css-1gt1ibw"><h2 id="next-steps" data-testid="title-next-steps" class="css-sycgw4">Next steps</h2></div></div> <div class="sectionbody"> <div class="ulist"> <ul> <li> <p><span><a data-testid="link" href="/docs/server/v4.1/overview/release-notes/" class="css-x7gnkn"> CircleCI server v4.1 release notes</a></span></p> </li> <li> <p><span><a data-testid="link" href="/docs/server/v4.1/installation/phase-1-prerequisites/" class="css-x7gnkn"> Server 4.x Installation Prerequisites</a></span></p> </li> </ul> </div> </div> </div></div><style data-emotion-css="7hkygd">.css-7hkygd{margin:1.25rem 0;}</style><section class="css-7hkygd"><hr/><style data-emotion-css="19dgxp1">.css-19dgxp1{box-sizing:border-box;min-width:0;margin:0;display:-webkit-box;display:-webkit-flex;display:-ms-flexbox;display:flex;-webkit-box-pack:justify;-webkit-justify-content:space-between;-ms-flex-pack:justify;justify-content:space-between;-webkit-flex-direction:row;-ms-flex-direction:row;flex-direction:row;-webkit-flex-wrap:nowrap;-ms-flex-wrap:nowrap;flex-wrap:nowrap;gap:4rem;}</style><div class="css-19dgxp1"><div class="css-qcooo9"><style data-emotion-css="2xshll">.css-2xshll{margin-bottom:1.25rem;margin-top:10px;}</style><style data-emotion-css="xvmmyz">.css-xvmmyz{box-sizing:border-box;min-width:0;margin:0;color:#161616;font-size:1.25rem;font-weight:500;line-height:1.4;margin-bottom:1.25rem;margin-top:10px;}</style><h4 class="css-xvmmyz">Suggest an edit to this 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cluster.\u003c/p\u003e \u003c/div\u003e \u003cdiv class=\"admonitionblock note\"\u003e \u003ctable\u003e \u003ctr\u003e \u003ctd class=\"icon\"\u003e \u003ci class=\"fa icon-note\" title=\"Note\"\u003e\u003c/i\u003e \u003c/td\u003e \u003ctd class=\"content\"\u003e For installation instructions, you have the option of either the \u003ca href=\"../../installation/phase-1-prerequisites/\"\u003eregular\u003c/a\u003e or \u003ca href=\"../../air-gapped-installation/phase-1-prerequisites/\"\u003eair-gapped\u003c/a\u003e installation guide. \u003c/td\u003e \u003c/tr\u003e \u003c/table\u003e \u003c/div\u003e \u003cdiv class=\"imageblock\"\u003e \u003cdiv class=\"content\"\u003e \u003cimg src=\"/docs/assets/img/docs/server-4-architecture-diagram.png\" alt=\"Server v4.x services architecture\"\u003e \u003c/div\u003e \u003cdiv class=\"title\"\u003eFigure 1. CircleCI server v4.x Architecture\u003c/div\u003e \u003c/div\u003e \u003cdiv class=\"paragraph\"\u003e \u003cp\u003eThe CircleCI server application exposes four services, using a single load balancer. If required, the load balancer can be made private, separating it from the public internet.\u003c/p\u003e \u003c/div\u003e \u003ctable class=\"tableblock frame-all grid-all stripes-even stretch table table-striped\"\u003e \u003ccolgroup\u003e \u003ccol style=\"width: 33.3333%;\"\u003e \u003ccol style=\"width: 33.3333%;\"\u003e \u003ccol style=\"width: 33.3334%;\"\u003e \u003c/colgroup\u003e \u003cthead\u003e \u003ctr\u003e \u003cth class=\"tableblock halign-left valign-top\"\u003eService\u003c/th\u003e \u003cth class=\"tableblock halign-left valign-top\"\u003ePorts\u003c/th\u003e \u003cth class=\"tableblock halign-left valign-top\"\u003eDescription\u003c/th\u003e \u003c/tr\u003e \u003c/thead\u003e \u003ctbody\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eFrontend GUI Proxy \u0026amp; API\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e80 and 443\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eExposes the web application.\u003c/p\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eNomad Control Plane\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e4647\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eExposes an RPC protocol for Nomad clients.\u003c/p\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eOutput Processor\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e8585\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eIngests output from Nomad runners.\u003c/p\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eVM Service\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e3000\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eProvisions virtual machines.\u003c/p\u003e\u003c/td\u003e \u003c/tr\u003e \u003c/tbody\u003e \u003c/table\u003e \u003cdiv class=\"paragraph\"\u003e \u003cp\u003eThe application exposes a number of external ports. These ports are used for various functions as defined in the table below.\u003c/p\u003e \u003c/div\u003e \u003ctable class=\"tableblock frame-all grid-all stripes-even stretch table table-striped\"\u003e \u003ccolgroup\u003e \u003ccol style=\"width: 16.6666%;\"\u003e \u003ccol style=\"width: 16.6666%;\"\u003e \u003ccol style=\"width: 16.6666%;\"\u003e \u003ccol style=\"width: 16.6666%;\"\u003e \u003ccol style=\"width: 16.6666%;\"\u003e \u003ccol style=\"width: 16.667%;\"\u003e \u003c/colgroup\u003e \u003cthead\u003e \u003ctr\u003e \u003cth class=\"tableblock halign-left valign-top\"\u003ePort number\u003c/th\u003e \u003cth class=\"tableblock halign-left valign-top\"\u003eProtocol\u003c/th\u003e \u003cth class=\"tableblock halign-left valign-top\"\u003eDirection\u003c/th\u003e \u003cth class=\"tableblock halign-left valign-top\"\u003eSource / Destination\u003c/th\u003e \u003cth class=\"tableblock halign-left valign-top\"\u003eUse\u003c/th\u003e \u003cth class=\"tableblock halign-left valign-top\"\u003eNotes\u003c/th\u003e \u003c/tr\u003e \u003c/thead\u003e \u003ctbody\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e80\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eTCP\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eInbound\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eEnd users\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eHTTP web app traffic\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e443\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eTCP\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eInbound\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eEnd users\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eHTTP web app traffic\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e22\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eTCP\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eInbound\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eAdministrators\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eSSH\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eOnly required for the bastion host.\u003c/p\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e64535-65535\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eTCP\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eInbound\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eSSH into builds\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eOnly required for the Nomad clients.\u003c/p\u003e\u003c/td\u003e \u003c/tr\u003e \u003c/tbody\u003e \u003c/table\u003e \u003cdiv class=\"paragraph\"\u003e \u003cp\u003eCircleCI server schedules CI jobs using the \u003ca href=\"https://www.nomadproject.io/\"\u003eNomad\u003c/a\u003e scheduler. The Nomad control plane runs inside of Kubernetes, while the Nomad clients, which are responsible for running scheduled CircleCI jobs, are provisioned outside the cluster. CircleCI server can run Docker jobs on the Nomad clients themselves or in a dedicated virtual machine (VM).\u003c/p\u003e \u003c/div\u003e \u003cdiv class=\"paragraph\"\u003e \u003cp\u003eJob artifacts and outputs are sent directly from jobs in Nomad to object storage (S3, Google Cloud Storage, or other supported options). Audit logs and other items from the application are also stored in object storage, so both the Kubernetes cluster and the Nomad clients need access to object storage.\u003c/p\u003e \u003c/div\u003e \u003c/div\u003e \u003c/div\u003e \u003cdiv class=\"sect1\"\u003e \u003ch2 id=\"services\"\u003eServices\u003c/h2\u003e \u003cdiv class=\"sectionbody\"\u003e \u003cdiv class=\"paragraph\"\u003e \u003cp\u003eCircleCI server v4.x consists of the following services. Find their descriptions and failure implications below:\u003c/p\u003e \u003c/div\u003e \u003ctable class=\"tableblock frame-all grid-all stripes-even stretch table table-striped\"\u003e \u003ccolgroup\u003e \u003ccol style=\"width: 20%;\"\u003e \u003ccol style=\"width: 20%;\"\u003e \u003ccol style=\"width: 20%;\"\u003e \u003ccol style=\"width: 20%;\"\u003e \u003ccol style=\"width: 20%;\"\u003e \u003c/colgroup\u003e \u003cthead\u003e \u003ctr\u003e \u003cth class=\"tableblock halign-left valign-top\"\u003eService\u003c/th\u003e \u003cth class=\"tableblock halign-left valign-top\"\u003eComponent\u003c/th\u003e \u003cth class=\"tableblock halign-left valign-top\"\u003eDescription\u003c/th\u003e \u003cth class=\"tableblock halign-left valign-top\"\u003eWhat happens if it fails?\u003c/th\u003e \u003cth class=\"tableblock halign-left valign-top\"\u003eNotes\u003c/th\u003e \u003c/tr\u003e \u003c/thead\u003e \u003ctbody\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e\u003ccode\u003eapi-service\u003c/code\u003e\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eApp Core\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eProvides a GraphQL API that provides data to render the web frontend.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eMany parts of the UI (such as Contexts) will fail completely.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e\u003ccode\u003eaudit-log-service\u003c/code\u003e\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eApp Core\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003ePersists audit log events to blob storage for long-term storage.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eSome events may not be recorded.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e\u003ccode\u003ebranch-service\u003c/code\u003e\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eApp Core\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eA service responsible for listening to the event stream. Detects branch deletions, job updates, pushes, workflow updates.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e\u003ccode\u003ebuilds-service\u003c/code\u003e\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eApp Core\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eIngests from www-api and sends to plans-service, workflows-conductor, and to orbs-service.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e\u003ccode\u003ecircleci-mongodb\u003c/code\u003e\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eExecution\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003ePrimary datastore\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e\u003ccode\u003ecircleci-postgres\u003c/code\u003e\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eData storage for microservices.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e\u003ccode\u003ecircleci-rabbitmq\u003c/code\u003e\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003ePipelines and Execution\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eQueuing for workflow messaging, test results, usage, crons, output, notifications, and scheduler.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e\u003ccode\u003ecircleci-redis\u003c/code\u003e\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eExecution\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eCaches data that will not be stored permanently (such as build logs), for request caching, and for rate limit calculations.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eA failed cache can result in rate limiting from the VCS if too many calls are made to it.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e\u003ccode\u003ecircleci-telegraf\u003c/code\u003e\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eTelegraf collects statsd metrics. All white-boxed metrics in our services publish statsd metrics that are sent to Telegraf, but can also be configured to be exported to other places (such as Datadog or Prometheus).\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e\u003ccode\u003ecircleci-vault\u003c/code\u003e\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eHashiCorp Vault to run encryption and decryption as a service for secrets.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e\u003ccode\u003econtexts-service\u003c/code\u003e\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eApp Core\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eStores and provides encrypted contexts.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eAll builds using Contexts will fail.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e\u003ccode\u003ecron-service\u003c/code\u003e\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003ePipelines\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eTriggers scheduled workflows.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eScheduled workflows will not run.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e\u003ccode\u003edispatcher\u003c/code\u003e\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eExecution\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eSplit jobs into tasks and send them to scheduler to run.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eNo jobs will be sent to Nomad. The run queue will increase in size, but there should be no meaningful loss of data.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e\u003ccode\u003edistributor-*\u003c/code\u003e\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eApp Core\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eResponsible for accepting build requests and distributing the job to appropriate queues.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e\u003ccode\u003edomain-service\u003c/code\u003e\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eApp Core\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eStores and provides information about our domain model. Works with permissions and API.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eWorkflows will fail to start and some REST API calls may fail, causing 500 errors in the CircleCI UI. If LDAP authentication is in use, all logins will fail.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e\u003ccode\u003efrontend\u003c/code\u003e\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eFrontend\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eCircleCI web app and www-api proxy.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eThe UI and REST API will be unavailable and no jobs will be triggered by GitHub/Enterprise. Running builds will be OK, but no updates will be seen.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eRate limit of 150 requests per second with a single user instantaneous limit of 300 requests.\u003c/p\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e\u003ccode\u003einsights-service\u003c/code\u003e\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eMetrics\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eA service to aggregate build and usage metrics for exporting and analysis.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e\u003ccode\u003ekong\u003c/code\u003e\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eApp Core\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eAPI management.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e\u003ccode\u003elegacy-notifier\u003c/code\u003e\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eApp Core\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eHandles notifications to external services (for example, Slack or email).\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e\u003ccode\u003enginx\u003c/code\u003e\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eApp Core / Frontend\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eHandles traffic redirection and ingress.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e\u003ccode\u003enomad-autoscaler\u003c/code\u003e\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eNomad\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eManages scaling of Nomad clusters in AWS and GCP environments.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e\u003ccode\u003enomad-server\u003c/code\u003e\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eNomad\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eResponsible for managing Nomad clients.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e\u003ccode\u003eorb-service\u003c/code\u003e\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003ePipelines\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eHandles communication between orb registry and config.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e\u003ccode\u003eoutput-processor\u003c/code\u003e\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eExecution\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eReceives job output and status updates and writes them to MongoDB. Also provides an API to running jobs to access caches, workspaces, store caches, workspaces, artifacts, \u0026amp; test results.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e\u003ccode\u003epermissions-service\u003c/code\u003e\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eApp Core\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eProvides the CircleCI permissions interface.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eWorkflows will fail to start and some REST API calls may fail, causing 500 errors in the UI.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e\u003ccode\u003escheduler\u003c/code\u003e\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eExecution\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eRuns tasks sent to it. Works with Nomad server.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eNo jobs will be sent to Nomad. The run queue will increase in size, but there should be no meaningful loss of data.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e\u003ccode\u003esocketi\u003c/code\u003e\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eFrontend\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eWebsockets server.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e\u003ccode\u003etelegraf\u003c/code\u003e\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eMetrics\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eCollection of metrics.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e\u003ccode\u003etest-results-service\u003c/code\u003e\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eExecution\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eParses test result files and stores data.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eThere will be no test failure or timing data for jobs, but this will be back-filled once the service is restarted.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e\u003ccode\u003evm-gc\u003c/code\u003e\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eCompute Management\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003ePeriodically checks for stale machine and remote Docker instances and requests that vm-service remove them.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eOld vm-service instances might not be destroyed until this service is restarted.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e\u003ccode\u003evm-scaler\u003c/code\u003e\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eMachine\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003ePeriodically requests that vm-service provision more instances for running machine and remote Docker jobs.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eVM instances for machine and Remote Docker might not be provisioned, causing you to run out of capacity to run jobs with these executors.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eDifferent overlay for EKS versus GKE.\u003c/p\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e\u003ccode\u003evm-service\u003c/code\u003e\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eMachine\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eInventory of available vm-service instances, and provisioning of new instances.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eJobs that use machine or remote Docker will fail.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e\u003ccode\u003eweb-ui-*\u003c/code\u003e\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eFrontend\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eMicro Front End (MFE) services used to render the frontend web application GUI.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eThe respective services page will fail to load. Example: A \u003ccode\u003eweb-ui-server-admin\u003c/code\u003e failure means the server Admin page will fail to load.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eThe MFEs are used to render the web application located at app.\u0026lt;my domain here\u0026gt;\u003c/p\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e\u003ccode\u003ewebhook-service\u003c/code\u003e\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eApp Core\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eService responsible for all webhooks, including management of state and handling events.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eworkflows-conductor-event-consumer\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003ePipelines\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eTakes in information from VCS to kick off pipelines.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eNew Pipelines will not be kicked off when there are changes in the VCS.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eworkflows-conductor-grpc\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003ePipelines\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eHelps translate the information through gRPC.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003c/tr\u003e \u003c/tbody\u003e \u003c/table\u003e \u003c/div\u003e \u003c/div\u003e \u003cdiv class=\"sect1\"\u003e \u003ch2 id=\"platforms\"\u003ePlatforms\u003c/h2\u003e \u003cdiv class=\"sectionbody\"\u003e \u003cdiv class=\"paragraph\"\u003e \u003cp\u003eCircleCI server is designed to deploy within a Kubernetes cluster. The virtual machine service (VM Service) is able to leverage unique EKS or GKE offerings to dynamically create VM images.\u003c/p\u003e \u003c/div\u003e \u003cdiv class=\"paragraph\"\u003e \u003cp\u003eIf installing outside of EKS or GKE, additional work is required to access some of the same machine build features. Setting up CircleCI runner gives you access to the same feature set as VM service across a much wider range of operating systems and machine types (for example, macOS).\u003c/p\u003e \u003c/div\u003e \u003cdiv class=\"paragraph\"\u003e \u003cp\u003eWe do our best to support a wide range of platforms for installation. We use environment-agnostic solutions wherever possible. However, we do not test all platforms and options. For that reason, we provide a list of tested environments, which we will continue to expand.\u003c/p\u003e \u003c/div\u003e \u003ctable class=\"tableblock frame-all grid-all stripes-even stretch table table-striped\"\u003e \u003ccolgroup\u003e \u003ccol style=\"width: 33.3333%;\"\u003e \u003ccol style=\"width: 33.3333%;\"\u003e \u003ccol style=\"width: 33.3334%;\"\u003e \u003c/colgroup\u003e \u003cthead\u003e \u003ctr\u003e \u003cth class=\"tableblock halign-left valign-top\"\u003eEnvironment\u003c/th\u003e \u003cth class=\"tableblock halign-left valign-top\"\u003eStatus\u003c/th\u003e \u003cth class=\"tableblock halign-left valign-top\"\u003eNotes\u003c/th\u003e \u003c/tr\u003e \u003c/thead\u003e \u003ctbody\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eEKS\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eTested\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eGKE\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eTested\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eLocal installation\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eTested\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eSee \u003ca href=\"../../air-gapped-installation/phase-1-prerequisites/\"\u003eAir-gapped installation\u003c/a\u003e docs\u003c/p\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eAzure\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eUntested\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eShould work with MinIO and Runner.\u003c/p\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eDigital Ocean\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eUntested\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eShould work with MinIO and Runner.\u003c/p\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eOpenShift\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eUntested\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eKnown not to work.\u003c/p\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eRancher\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eUntested\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eShould work with MinIO and Runner.\u003c/p\u003e\u003c/td\u003e \u003c/tr\u003e \u003c/tbody\u003e \u003c/table\u003e \u003c/div\u003e \u003c/div\u003e \u003cdiv class=\"sect1\"\u003e \u003ch2 id=\"next-steps\"\u003eNext steps\u003c/h2\u003e \u003cdiv class=\"sectionbody\"\u003e \u003cdiv class=\"ulist\"\u003e \u003cul\u003e \u003cli\u003e \u003cp\u003e\u003ca href=\"../release-notes/\"\u003eCircleCI server v4.1 release notes\u003c/a\u003e\u003c/p\u003e \u003c/li\u003e \u003cli\u003e \u003cp\u003e\u003ca href=\"../../installation/phase-1-prerequisites/\"\u003eServer 4.x Installation Prerequisites\u003c/a\u003e\u003c/p\u003e \u003c/li\u003e \u003c/ul\u003e \u003c/div\u003e \u003c/div\u003e \u003c/div\u003e","frontMatter":{"draft":false,"categories":[],"last_modified_at":"04-Sep-24","hide":false,"search":true,"toc":true,"suggested":false,"sitemap":true,"readtime":true,"contentTags":{"platform":["Server v4.1","Server Admin"]},"sectionTags":null,"lang":"en","noindex":true,"title":"CircleCI server v4.1 overview","slug":"circleci-server-overview","ext":".adoc","tags":[],"excerpt":"\u003cdiv class=\"sect1\"\u003e\n\u003ch2 id=\"introduction\"\u003eIntroduction\u003c/h2\u003e\n\u003cdiv class=\"sectionbody\"\u003e\n\n\u003c/div\u003e\n\u003c/div\u003e","asciidoc":true,"layout":"classic-docs","liquid":"","description":"CircleCI server v4.1 is a continuous integration and continuous delivery (CI/CD) platform that you can install on your GCP or AWS Kubernetes cluster.","category":null,"tag":null,"excerpt_origin":"body","document":"#\u003cAsciidoctor::Document@10580 {doctype: \"article\", doctitle: \"CircleCI server v4.1 overview\", blocks: 4}\u003e","date":"2024-11-30 08:44:32 +0000","content":"\u003cdiv class=\"sect1\"\u003e \u003ch2 id=\"introduction\"\u003eIntroduction\u003c/h2\u003e \u003cdiv class=\"sectionbody\"\u003e \u003cdiv class=\"paragraph\"\u003e \u003cp\u003eCircleCI server is an on-premises CI/CD platform for enterprise customers who have compliance or security needs that require them to operate within their firewall, in a private cloud, or in a data center.\u003c/p\u003e \u003c/div\u003e \u003cdiv class=\"paragraph\"\u003e \u003cp\u003eCircleCI server provides the same features as CircleCI’s cloud offering, but operates within your Kubernetes cluster.\u003c/p\u003e \u003c/div\u003e \u003cdiv class=\"admonitionblock note\"\u003e \u003ctable\u003e \u003ctr\u003e \u003ctd class=\"icon\"\u003e \u003ci class=\"fa icon-note\" title=\"Note\"\u003e\u003c/i\u003e \u003c/td\u003e \u003ctd class=\"content\"\u003e For installation instructions, you have the option of either the \u003ca href=\"../../installation/phase-1-prerequisites/\"\u003eregular\u003c/a\u003e or \u003ca href=\"../../air-gapped-installation/phase-1-prerequisites/\"\u003eair-gapped\u003c/a\u003e installation guide. \u003c/td\u003e \u003c/tr\u003e \u003c/table\u003e \u003c/div\u003e \u003cdiv class=\"imageblock\"\u003e \u003cdiv class=\"content\"\u003e \u003cimg src=\"/docs/assets/img/docs/server-4-architecture-diagram.png\" alt=\"Server v4.x services architecture\"\u003e \u003c/div\u003e \u003cdiv class=\"title\"\u003eFigure 1. CircleCI server v4.x Architecture\u003c/div\u003e \u003c/div\u003e \u003cdiv class=\"paragraph\"\u003e \u003cp\u003eThe CircleCI server application exposes four services, using a single load balancer. If required, the load balancer can be made private, separating it from the public internet.\u003c/p\u003e \u003c/div\u003e \u003ctable class=\"tableblock frame-all grid-all stripes-even stretch table table-striped\"\u003e \u003ccolgroup\u003e \u003ccol style=\"width: 33.3333%;\"\u003e \u003ccol style=\"width: 33.3333%;\"\u003e \u003ccol style=\"width: 33.3334%;\"\u003e \u003c/colgroup\u003e \u003cthead\u003e \u003ctr\u003e \u003cth class=\"tableblock halign-left valign-top\"\u003eService\u003c/th\u003e \u003cth class=\"tableblock halign-left valign-top\"\u003ePorts\u003c/th\u003e \u003cth class=\"tableblock halign-left valign-top\"\u003eDescription\u003c/th\u003e \u003c/tr\u003e \u003c/thead\u003e \u003ctbody\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eFrontend GUI Proxy \u0026amp; API\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e80 and 443\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eExposes the web application.\u003c/p\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eNomad Control Plane\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e4647\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eExposes an RPC protocol for Nomad clients.\u003c/p\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eOutput Processor\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e8585\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eIngests output from Nomad runners.\u003c/p\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eVM Service\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e3000\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eProvisions virtual machines.\u003c/p\u003e\u003c/td\u003e \u003c/tr\u003e \u003c/tbody\u003e \u003c/table\u003e \u003cdiv class=\"paragraph\"\u003e \u003cp\u003eThe application exposes a number of external ports. These ports are used for various functions as defined in the table below.\u003c/p\u003e \u003c/div\u003e \u003ctable class=\"tableblock frame-all grid-all stripes-even stretch table table-striped\"\u003e \u003ccolgroup\u003e \u003ccol style=\"width: 16.6666%;\"\u003e \u003ccol style=\"width: 16.6666%;\"\u003e \u003ccol style=\"width: 16.6666%;\"\u003e \u003ccol style=\"width: 16.6666%;\"\u003e \u003ccol style=\"width: 16.6666%;\"\u003e \u003ccol style=\"width: 16.667%;\"\u003e \u003c/colgroup\u003e \u003cthead\u003e \u003ctr\u003e \u003cth class=\"tableblock halign-left valign-top\"\u003ePort number\u003c/th\u003e \u003cth class=\"tableblock halign-left valign-top\"\u003eProtocol\u003c/th\u003e \u003cth class=\"tableblock halign-left valign-top\"\u003eDirection\u003c/th\u003e \u003cth class=\"tableblock halign-left valign-top\"\u003eSource / Destination\u003c/th\u003e \u003cth class=\"tableblock halign-left valign-top\"\u003eUse\u003c/th\u003e \u003cth class=\"tableblock halign-left valign-top\"\u003eNotes\u003c/th\u003e \u003c/tr\u003e \u003c/thead\u003e \u003ctbody\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e80\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eTCP\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eInbound\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eEnd users\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eHTTP web app traffic\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e443\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eTCP\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eInbound\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eEnd users\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eHTTP web app traffic\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e22\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eTCP\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eInbound\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eAdministrators\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eSSH\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eOnly required for the bastion host.\u003c/p\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e64535-65535\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eTCP\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eInbound\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eSSH into builds\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eOnly required for the Nomad clients.\u003c/p\u003e\u003c/td\u003e \u003c/tr\u003e \u003c/tbody\u003e \u003c/table\u003e \u003cdiv class=\"paragraph\"\u003e \u003cp\u003eCircleCI server schedules CI jobs using the \u003ca href=\"https://www.nomadproject.io/\"\u003eNomad\u003c/a\u003e scheduler. The Nomad control plane runs inside of Kubernetes, while the Nomad clients, which are responsible for running scheduled CircleCI jobs, are provisioned outside the cluster. CircleCI server can run Docker jobs on the Nomad clients themselves or in a dedicated virtual machine (VM).\u003c/p\u003e \u003c/div\u003e \u003cdiv class=\"paragraph\"\u003e \u003cp\u003eJob artifacts and outputs are sent directly from jobs in Nomad to object storage (S3, Google Cloud Storage, or other supported options). Audit logs and other items from the application are also stored in object storage, so both the Kubernetes cluster and the Nomad clients need access to object storage.\u003c/p\u003e \u003c/div\u003e \u003c/div\u003e \u003c/div\u003e \u003cdiv class=\"sect1\"\u003e \u003ch2 id=\"services\"\u003eServices\u003c/h2\u003e \u003cdiv class=\"sectionbody\"\u003e \u003cdiv class=\"paragraph\"\u003e \u003cp\u003eCircleCI server v4.x consists of the following services. Find their descriptions and failure implications below:\u003c/p\u003e \u003c/div\u003e \u003ctable class=\"tableblock frame-all grid-all stripes-even stretch table table-striped\"\u003e \u003ccolgroup\u003e \u003ccol style=\"width: 20%;\"\u003e \u003ccol style=\"width: 20%;\"\u003e \u003ccol style=\"width: 20%;\"\u003e \u003ccol style=\"width: 20%;\"\u003e \u003ccol style=\"width: 20%;\"\u003e \u003c/colgroup\u003e \u003cthead\u003e \u003ctr\u003e \u003cth class=\"tableblock halign-left valign-top\"\u003eService\u003c/th\u003e \u003cth class=\"tableblock halign-left valign-top\"\u003eComponent\u003c/th\u003e \u003cth class=\"tableblock halign-left valign-top\"\u003eDescription\u003c/th\u003e \u003cth class=\"tableblock halign-left valign-top\"\u003eWhat happens if it fails?\u003c/th\u003e \u003cth class=\"tableblock halign-left valign-top\"\u003eNotes\u003c/th\u003e \u003c/tr\u003e \u003c/thead\u003e \u003ctbody\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e\u003ccode\u003eapi-service\u003c/code\u003e\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eApp Core\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eProvides a GraphQL API that provides data to render the web frontend.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eMany parts of the UI (such as Contexts) will fail completely.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e\u003ccode\u003eaudit-log-service\u003c/code\u003e\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eApp Core\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003ePersists audit log events to blob storage for long-term storage.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eSome events may not be recorded.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e\u003ccode\u003ebranch-service\u003c/code\u003e\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eApp Core\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eA service responsible for listening to the event stream. Detects branch deletions, job updates, pushes, workflow updates.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e\u003ccode\u003ebuilds-service\u003c/code\u003e\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eApp Core\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eIngests from www-api and sends to plans-service, workflows-conductor, and to orbs-service.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e\u003ccode\u003ecircleci-mongodb\u003c/code\u003e\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eExecution\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003ePrimary datastore\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e\u003ccode\u003ecircleci-postgres\u003c/code\u003e\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eData storage for microservices.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e\u003ccode\u003ecircleci-rabbitmq\u003c/code\u003e\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003ePipelines and Execution\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eQueuing for workflow messaging, test results, usage, crons, output, notifications, and scheduler.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e\u003ccode\u003ecircleci-redis\u003c/code\u003e\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eExecution\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eCaches data that will not be stored permanently (such as build logs), for request caching, and for rate limit calculations.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eA failed cache can result in rate limiting from the VCS if too many calls are made to it.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e\u003ccode\u003ecircleci-telegraf\u003c/code\u003e\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eTelegraf collects statsd metrics. All white-boxed metrics in our services publish statsd metrics that are sent to Telegraf, but can also be configured to be exported to other places (such as Datadog or Prometheus).\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e\u003ccode\u003ecircleci-vault\u003c/code\u003e\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eHashiCorp Vault to run encryption and decryption as a service for secrets.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e\u003ccode\u003econtexts-service\u003c/code\u003e\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eApp Core\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eStores and provides encrypted contexts.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eAll builds using Contexts will fail.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e\u003ccode\u003ecron-service\u003c/code\u003e\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003ePipelines\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eTriggers scheduled workflows.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eScheduled workflows will not run.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e\u003ccode\u003edispatcher\u003c/code\u003e\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eExecution\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eSplit jobs into tasks and send them to scheduler to run.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eNo jobs will be sent to Nomad. The run queue will increase in size, but there should be no meaningful loss of data.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e\u003ccode\u003edistributor-*\u003c/code\u003e\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eApp Core\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eResponsible for accepting build requests and distributing the job to appropriate queues.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e\u003ccode\u003edomain-service\u003c/code\u003e\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eApp Core\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eStores and provides information about our domain model. Works with permissions and API.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eWorkflows will fail to start and some REST API calls may fail, causing 500 errors in the CircleCI UI. If LDAP authentication is in use, all logins will fail.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e\u003ccode\u003efrontend\u003c/code\u003e\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eFrontend\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eCircleCI web app and www-api proxy.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eThe UI and REST API will be unavailable and no jobs will be triggered by GitHub/Enterprise. Running builds will be OK, but no updates will be seen.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eRate limit of 150 requests per second with a single user instantaneous limit of 300 requests.\u003c/p\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e\u003ccode\u003einsights-service\u003c/code\u003e\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eMetrics\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eA service to aggregate build and usage metrics for exporting and analysis.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e\u003ccode\u003ekong\u003c/code\u003e\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eApp Core\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eAPI management.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e\u003ccode\u003elegacy-notifier\u003c/code\u003e\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eApp Core\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eHandles notifications to external services (for example, Slack or email).\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e\u003ccode\u003enginx\u003c/code\u003e\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eApp Core / Frontend\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eHandles traffic redirection and ingress.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e\u003ccode\u003enomad-autoscaler\u003c/code\u003e\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eNomad\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eManages scaling of Nomad clusters in AWS and GCP environments.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e\u003ccode\u003enomad-server\u003c/code\u003e\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eNomad\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eResponsible for managing Nomad clients.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e\u003ccode\u003eorb-service\u003c/code\u003e\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003ePipelines\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eHandles communication between orb registry and config.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e\u003ccode\u003eoutput-processor\u003c/code\u003e\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eExecution\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eReceives job output and status updates and writes them to MongoDB. Also provides an API to running jobs to access caches, workspaces, store caches, workspaces, artifacts, \u0026amp; test results.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e\u003ccode\u003epermissions-service\u003c/code\u003e\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eApp Core\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eProvides the CircleCI permissions interface.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eWorkflows will fail to start and some REST API calls may fail, causing 500 errors in the UI.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e\u003ccode\u003escheduler\u003c/code\u003e\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eExecution\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eRuns tasks sent to it. Works with Nomad server.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eNo jobs will be sent to Nomad. The run queue will increase in size, but there should be no meaningful loss of data.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e\u003ccode\u003esocketi\u003c/code\u003e\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eFrontend\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eWebsockets server.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e\u003ccode\u003etelegraf\u003c/code\u003e\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eMetrics\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eCollection of metrics.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e\u003ccode\u003etest-results-service\u003c/code\u003e\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eExecution\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eParses test result files and stores data.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eThere will be no test failure or timing data for jobs, but this will be back-filled once the service is restarted.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e\u003ccode\u003evm-gc\u003c/code\u003e\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eCompute Management\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003ePeriodically checks for stale machine and remote Docker instances and requests that vm-service remove them.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eOld vm-service instances might not be destroyed until this service is restarted.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e\u003ccode\u003evm-scaler\u003c/code\u003e\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eMachine\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003ePeriodically requests that vm-service provision more instances for running machine and remote Docker jobs.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eVM instances for machine and Remote Docker might not be provisioned, causing you to run out of capacity to run jobs with these executors.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eDifferent overlay for EKS versus GKE.\u003c/p\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e\u003ccode\u003evm-service\u003c/code\u003e\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eMachine\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eInventory of available vm-service instances, and provisioning of new instances.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eJobs that use machine or remote Docker will fail.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e\u003ccode\u003eweb-ui-*\u003c/code\u003e\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eFrontend\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eMicro Front End (MFE) services used to render the frontend web application GUI.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eThe respective services page will fail to load. Example: A \u003ccode\u003eweb-ui-server-admin\u003c/code\u003e failure means the server Admin page will fail to load.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eThe MFEs are used to render the web application located at app.\u0026lt;my domain here\u0026gt;\u003c/p\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003e\u003ccode\u003ewebhook-service\u003c/code\u003e\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eApp Core\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eService responsible for all webhooks, including management of state and handling events.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eworkflows-conductor-event-consumer\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003ePipelines\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eTakes in information from VCS to kick off pipelines.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eNew Pipelines will not be kicked off when there are changes in the VCS.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eworkflows-conductor-grpc\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003ePipelines\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eHelps translate the information through gRPC.\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003c/tr\u003e \u003c/tbody\u003e \u003c/table\u003e \u003c/div\u003e \u003c/div\u003e \u003cdiv class=\"sect1\"\u003e \u003ch2 id=\"platforms\"\u003ePlatforms\u003c/h2\u003e \u003cdiv class=\"sectionbody\"\u003e \u003cdiv class=\"paragraph\"\u003e \u003cp\u003eCircleCI server is designed to deploy within a Kubernetes cluster. The virtual machine service (VM Service) is able to leverage unique EKS or GKE offerings to dynamically create VM images.\u003c/p\u003e \u003c/div\u003e \u003cdiv class=\"paragraph\"\u003e \u003cp\u003eIf installing outside of EKS or GKE, additional work is required to access some of the same machine build features. Setting up CircleCI runner gives you access to the same feature set as VM service across a much wider range of operating systems and machine types (for example, macOS).\u003c/p\u003e \u003c/div\u003e \u003cdiv class=\"paragraph\"\u003e \u003cp\u003eWe do our best to support a wide range of platforms for installation. We use environment-agnostic solutions wherever possible. However, we do not test all platforms and options. For that reason, we provide a list of tested environments, which we will continue to expand.\u003c/p\u003e \u003c/div\u003e \u003ctable class=\"tableblock frame-all grid-all stripes-even stretch table table-striped\"\u003e \u003ccolgroup\u003e \u003ccol style=\"width: 33.3333%;\"\u003e \u003ccol style=\"width: 33.3333%;\"\u003e \u003ccol style=\"width: 33.3334%;\"\u003e \u003c/colgroup\u003e \u003cthead\u003e \u003ctr\u003e \u003cth class=\"tableblock halign-left valign-top\"\u003eEnvironment\u003c/th\u003e \u003cth class=\"tableblock halign-left valign-top\"\u003eStatus\u003c/th\u003e \u003cth class=\"tableblock halign-left valign-top\"\u003eNotes\u003c/th\u003e \u003c/tr\u003e \u003c/thead\u003e \u003ctbody\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eEKS\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eTested\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eGKE\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eTested\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eLocal installation\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eTested\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eSee \u003ca href=\"../../air-gapped-installation/phase-1-prerequisites/\"\u003eAir-gapped installation\u003c/a\u003e docs\u003c/p\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eAzure\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eUntested\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eShould work with MinIO and Runner.\u003c/p\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eDigital Ocean\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eUntested\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eShould work with MinIO and Runner.\u003c/p\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eOpenShift\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eUntested\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eKnown not to work.\u003c/p\u003e\u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eRancher\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eUntested\u003c/p\u003e\u003c/td\u003e \u003ctd class=\"tableblock halign-left valign-top\"\u003e\u003cp class=\"tableblock\"\u003eShould work with MinIO and Runner.\u003c/p\u003e\u003c/td\u003e \u003c/tr\u003e \u003c/tbody\u003e \u003c/table\u003e \u003c/div\u003e \u003c/div\u003e \u003cdiv class=\"sect1\"\u003e \u003ch2 id=\"next-steps\"\u003eNext steps\u003c/h2\u003e \u003cdiv class=\"sectionbody\"\u003e \u003cdiv class=\"ulist\"\u003e \u003cul\u003e \u003cli\u003e \u003cp\u003e\u003ca href=\"../release-notes/\"\u003eCircleCI server v4.1 release notes\u003c/a\u003e\u003c/p\u003e \u003c/li\u003e \u003cli\u003e \u003cp\u003e\u003ca href=\"../../installation/phase-1-prerequisites/\"\u003eServer 4.x Installation Prerequisites\u003c/a\u003e\u003c/p\u003e \u003c/li\u003e \u003c/ul\u003e \u003c/div\u003e \u003c/div\u003e \u003c/div\u003e","file_name":"_cci2/server/v4.1/overview/circleci-server-overview.adoc"}},"__lang":"en","__namespaces":{"common":{"appName":"Docs","metaTitle":"Welcome to CircleCI Documentation","metaDescription":"Welcome to CircleCI Documentation"},"header":{"loginButton":{"loggedIn":{"text":"Go to Application","href":"https://app.circleci.com/"},"loggedOut":{"text":"Start Building for Free","href":"https://circleci.com/signup/"}}},"search":{"searchBarPlaceholder":"Search Documentation","docsTab":{"long":"Documentation","short":"Docs"},"orbsTab":{"long":"Orbs","short":"Orbs"},"imagesTab":{"long":"Convenience Images","short":"Images"},"noResults":"No {{type}} results"},"content":{"copyLink":{"copy":"Copy link","copied":"Copied!"},"pageMeta":{"lastUpdateReadTime":"Last updated • Read time","cloudServer":"This document is applicable to CircleCI {{platform}}"},"pageFooter":{"editTitle":"Suggest an edit to this page","makeContribution":"Make a contribution","learnContribution":"Learn how to contribute","helpTitle":"Still need help?","askCommunity":"Ask the CircleCI community","researchCommunity":"Join the research community","support":"Visit our Support site"},"on_this_page":"On This Page","translationInProgress":"This page is in the process of being translated."}},"__N_SSP":true},"page":"/[...slug]","query":{"slug":["server","v4.1","overview","circleci-server-overview"]},"buildId":"9e2f0ef33c33cd80cc959c1747acd17d270b8bd8","assetPrefix":"https://assets-docs.circleci.com/docs","runtimeConfig":{"basePath":"/docs","exceptionLoggerClientToken":"ca1befe4db724589813fc4a2a9642d4d","analyticsKey":"AbgkrgN4cbRhAVEwlzMkHbwvrXnxHh35","datadogRumApplicationId":"2a3e19ca-297e-4a53-a2cf-082e827d13d3","datadogRumClientToken":"pubdffb4b4dd07f1f43b42276901d58da91","isPreviewSite":false},"isFallback":false,"isExperimentalCompile":false,"gssp":true,"appGip":true,"locale":"en","locales":["en","ja"],"defaultLocale":"en","scriptLoader":[]}</script></body></html>