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class="vector-toc-link"> <div class="vector-toc-text">Beginning</div> </a> </li> <li id="toc-Hosts_and_services" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Hosts_and_services"> <div class="vector-toc-text"> <span class="vector-toc-numb">1</span> <span>Hosts and services</span> </div> </a> <ul id="toc-Hosts_and_services-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Switching_over" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Switching_over"> <div class="vector-toc-text"> <span class="vector-toc-numb">2</span> <span>Switching over</span> </div> </a> <button aria-controls="toc-Switching_over-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Toggle Switching over subsection</span> </button> <ul id="toc-Switching_over-sublist" class="vector-toc-list"> <li id="toc-synchronize_build_artifacts" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#synchronize_build_artifacts"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.1</span> <span>synchronize build artifacts</span> </div> </a> <ul id="toc-synchronize_build_artifacts-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Stop_all_services" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Stop_all_services"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.2</span> <span>Stop all services</span> </div> </a> <ul id="toc-Stop_all_services-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-rsync_data_and_states" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#rsync_data_and_states"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.3</span> <span>rsync data and states</span> </div> </a> <ul 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var(--border-color-progressive,#36c);background-color:var(--background-color-neutral-subtle,#f8f9fa);box-sizing:border-box}.mw-parser-output table.ambox+table.ambox,.mw-parser-output table.ambox+link+table.ambox,.mw-parser-output table.ambox+style+table.ambox{margin-top:-1px}.mw-parser-output .ambox td.mbox-empty-cell{border:none;padding:0;width:1px}.mw-parser-output .ambox th.mbox-text,.mw-parser-output .ambox td.mbox-text{border:none;padding:0.25em 0.5em;width:100%}.mw-parser-output .ambox td.mbox-image{padding:2px 0 2px 0.5em}.mw-parser-output .ambox td.mbox-imageright{padding:2px 0.5em 2px 0}.mw-parser-output table.ambox-notice{border-left-color:var(--border-color-progressive,#36c)}.mw-parser-output table.ambox-speedy{background-color:var(--background-color-error-subtle,#fee7e6)}.mw-parser-output table.ambox-delete,.mw-parser-output table.ambox-speedy{border-left-color:var(--background-color-error--active,#b32424)}.mw-parser-output table.ambox-content{border-left-color:#f28500}.mw-parser-output table.ambox-style{border-left-color:#fc3}.mw-parser-output table.ambox-move{border-left-color:#9932cc}.mw-parser-output table.ambox-protection{border-left-color:var(--border-color-base,#a2a9b1)}html body.mediawiki .mw-parser-output .ambox.mbox-small{clear:right;float:right;margin:4px 0 4px 1em;box-sizing:border-box;width:238px;font-size:88%;line-height:1.25em}html body.mediawiki .mw-parser-output .ambox.mbox-small-left{margin:4px 1em 4px 0;box-sizing:border-box;overflow:hidden;width:238px;border-collapse:collapse;font-size:88%;line-height:1.25em}</style><table class="ambox ambox-notice plainlinks metadata" role="presentation"><tbody><tr><td class="mbox-image"><div style="width:52px"><span typeof="mw:File"><a href="/wiki/File:Under_construction_icon-blue.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d5/Under_construction_icon-blue.svg/50px-Under_construction_icon-blue.svg.png" decoding="async" width="50" height="42" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d5/Under_construction_icon-blue.svg/75px-Under_construction_icon-blue.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d5/Under_construction_icon-blue.svg/100px-Under_construction_icon-blue.svg.png 2x" data-file-width="600" data-file-height="500"/></a></span></div></td><td class="mbox-text"><div class="mbox-text-span"><b>This page is currently a draft.</b> <div class="hide-when-compact">More information and discussion about changes to this draft may be on the <a class="external text" href="https://www.mediawiki.org/wiki/Talk:Continuous_integration/Data_center_switch">discussion page</a>. </div></div></td></tr></tbody></table> <p>The core of the CI infrastructure is hosted on two production machines, one in each datacenter. Most services are active solely on one of the hosts, the other host acting as a cold spare. When doing hardware maintenance or operating system upgrades, we move the services and their data from an host to another one. This document describe the steps needed to do the swap. </p> <meta property="mw:PageProp/toc"/> <div class="mw-heading mw-heading2 ext-discussiontools-init-section"><h2 id="Hosts_and_services" data-mw-thread-id="h-Hosts_and_services"><span data-mw-comment-start="" id="h-Hosts_and_services"></span>Hosts and services<span data-mw-comment-end="h-Hosts_and_services"></span></h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Continuous_integration/Data_center_switch&action=edit&section=1" title="Edit section: Hosts and services"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>We have two bare metal hosts <code>contint1001.wikimedia.org</code> and <code>contint2001.wikimedia.org</code>, one in each of our primary datacenters. They hosts a variety of services: </p> <ul><li><a href="/wiki/Continuous_integration/Zuul" title="Continuous integration/Zuul">Zuul</a>: the scheduler and workflow system</li> <li><a href="/wiki/Continuous_integration/Zuul" title="Continuous integration/Zuul">Zuul mergers</a> and their associated git-daemon. <b>Active on both servers!</b></li> <li><a href="/wiki/Continuous_integration/Jenkins" title="Continuous integration/Jenkins">Jenkins</a> holding jobs, their build history and artifacts</li> <li>The website <a class="external free" href="https://integration.wikimedia.org/">https://integration.wikimedia.org/</a> and the proxies to the above services: <ul><li>Zuul status <a class="external free" href="https://integration.wikimedia.org/zuul/">https://integration.wikimedia.org/zuul/</a></li> <li>Jenkins interface <a class="external free" href="https://integration.wikimedia.org/ci/">https://integration.wikimedia.org/ci/</a></li></ul></li> <li><code>docker-pkg</code> to build images</li> <li>Docker daemon and images</li></ul> <div class="mw-heading mw-heading2 ext-discussiontools-init-section"><h2 id="Switching_over" data-mw-thread-id="h-Switching_over"><span data-mw-comment-start="" id="h-Switching_over"></span>Switching over<span data-mw-comment-end="h-Switching_over"></span></h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Continuous_integration/Data_center_switch&action=edit&section=2" title="Edit section: Switching over"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The general idea is to synchronize Jenkins files from the primary to the spare server before anything else. Once done the sequence overview is: </p> <ul><li>synchronize build artifacts</li> <li>Stop all services on the primary</li> <li>rsync data and states</li> <li>change DNS for <code>contint.wikimedia.org</code></li> <li>change primary in Puppet / Hiera</li> <li>Start Jenkins</li> <li>Start Zuul scheduler</li></ul> <div class="mw-heading mw-heading3"><h3 id="synchronize_build_artifacts" data-mw-thread-id="h-synchronize_build_artifacts-Switching_over"><span data-mw-comment-start="" id="h-synchronize_build_artifacts-Switching_over"></span>synchronize build artifacts<span data-mw-comment-end="h-synchronize_build_artifacts-Switching_over"></span></h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Continuous_integration/Data_center_switch&action=edit&section=3" title="Edit section: synchronize build artifacts"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p><b>This step should be made ahead of time since it takes hours to transfer.</b> </p><p>The Jenkins builds history and their artifacts are solely on the primary Jenkins and located in <code>/srv/jenkins/builds</code>. It is in the magnitude of hundred of gigabytes and million of files and directories. </p><p>On the spare server, ensure <code>/srv/jenkins/builds</code> is empty. </p><p>TODO: check <a href="/w/index.php?title=Transfer.py&action=edit&redlink=1" class="new" title="Transfer.py (page does not exist)">Transfer.py</a> or <a href="/w/index.php?title=MariaDB/ImportTableSpace&action=edit&redlink=1" class="new" title="MariaDB/ImportTableSpace (page does not exist)">MariaDB/ImportTableSpace</a>. </p> <div class="mw-heading mw-heading3"><h3 id="Stop_all_services" data-mw-thread-id="h-Stop_all_services-Switching_over"><span data-mw-comment-start="" id="h-Stop_all_services-Switching_over"></span>Stop all services<span data-mw-comment-end="h-Stop_all_services-Switching_over"></span></h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Continuous_integration/Data_center_switch&action=edit&section=4" title="Edit section: Stop all services"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>On the primary: <code> systemctl stop jenkins systemctl stop zuul </code> </p> <div class="mw-heading mw-heading3"><h3 id="rsync_data_and_states" data-mw-thread-id="h-rsync_data_and_states-Switching_over"><span data-mw-comment-start="" id="h-rsync_data_and_states-Switching_over"></span>rsync data and states<span data-mw-comment-end="h-rsync_data_and_states-Switching_over"></span></h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Continuous_integration/Data_center_switch&action=edit&section=5" title="Edit section: rsync data and states"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Using rsync over ssh as root: </p> <ul><li>refresh <code>/srv/jenkins/builds</code> from the artifacts from the primary to the spare.</li></ul> <p>Transfer the Jenkins and Zuul states: </p> <ul><li><code>/var/lib/jenkins</code> , jobs configurations, build indice, plugins etc</li> <li><code>/var/lib/zuul/times</code> , duration of functions execution used to speculate an ETA of each build</li></ul> <div class="mw-heading mw-heading3"><h3 id="change_DNS" data-mw-thread-id="h-change_DNS-Switching_over"><span data-mw-comment-start="" id="h-change_DNS-Switching_over"></span>change DNS<span data-mw-comment-end="h-change_DNS-Switching_over"></span></h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Continuous_integration/Data_center_switch&action=edit&section=6" title="Edit section: change DNS"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The Varnish/ATS layer points to the backend via the DNS entry <code>contint.wikimedia.org</code> which in turns point to the primary host. </p> <div class="mw-heading mw-heading3"><h3 id="change_primary_in_Puppet_/_Hiera" data-mw-thread-id="h-change_primary_in_Puppet_/_Hiera-Switching_over"><span id="change_primary_in_Puppet_.2F_Hiera"></span><span data-mw-comment-start="" id="h-change_primary_in_Puppet_/_Hiera-Switching_over"></span>change primary in Puppet / Hiera<span data-mw-comment-end="h-change_primary_in_Puppet_/_Hiera-Switching_over"></span></h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Continuous_integration/Data_center_switch&action=edit&section=7" title="Edit section: change primary in Puppet / Hiera"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>TODO: find the changes that need to happen. Ideally should just be a role change. </p> <div class="mw-heading mw-heading3"><h3 id="Start_services" data-mw-thread-id="h-Start_services-Switching_over"><span data-mw-comment-start="" id="h-Start_services-Switching_over"></span>Start services<span data-mw-comment-end="h-Start_services-Switching_over"></span></h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Continuous_integration/Data_center_switch&action=edit&section=8" title="Edit section: Start services"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>On the new primary: <code> systemctl stop jenkins systemctl stop zuul </code> </p>    </div><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?type=1x1&useformat=desktop" alt="" width="1" height="1" style="border: none; position: absolute;"></noscript> <div class="printfooter" data-nosnippet="">Retrieved from "<a dir="ltr" href="https://www.mediawiki.org/w/index.php?title=Continuous_integration/Data_center_switch&oldid=4272961">https://www.mediawiki.org/w/index.php?title=Continuous_integration/Data_center_switch&oldid=4272961</a>"</div></div> <div id="catlinks" class="catlinks catlinks-allhidden" data-mw="interface"><div id="mw-hidden-catlinks" class="mw-hidden-catlinks mw-hidden-cats-hidden">Hidden category: <ul><li><a href="/wiki/Category:Drafts" title="Category:Drafts">Drafts</a></li></ul></div></div> </div> </main> </div> <div class="mw-footer-container"> <footer id="footer" class="mw-footer" > <ul id="footer-info"> <li id="footer-info-lastmod"> This page was last edited on 10 December 2020, at 09:52.</li> <li id="footer-info-copyright">Text is available under the <a rel="nofollow" class="external text" href="https://creativecommons.org/licenses/by-sa/4.0/deed.en">Creative Commons Attribution-ShareAlike License</a>; additional terms may apply. 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