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type-post status-publish format-standard has-post-thumbnail hentry category-uncategorized"> <header class="entry-header"> <div class="entry-meta"><span class="screen-reader-text">Veröffentlicht am</span> <a href="https://tech.babiel.com/puppet-openvox-easy-incremental-rollout/" rel="bookmark"><time class="entry-date published" datetime="2025-03-10T11:44:34+02:00">10. März 2025</time><time class="updated" datetime="2025-03-10T11:49:47+02:00">10. März 2025</time></a></div><h3 class="entry-title"><a href="https://tech.babiel.com/puppet-openvox-easy-incremental-rollout/" rel="bookmark">Puppet/OpenVox: easy incremental rollout</a></h3> </header> <div class="post-thumbnail"> <a href="https://tech.babiel.com/puppet-openvox-easy-incremental-rollout/"> <img width="1015" height="463" src="https://tech.babiel.com/wp-content/uploads/2025/03/Wuerfel_-_2021_-_4265-1.jpg" class="attachment-twentyseventeen-featured-image size-twentyseventeen-featured-image wp-post-image" alt="" decoding="async" srcset="https://tech.babiel.com/wp-content/uploads/2025/03/Wuerfel_-_2021_-_4265-1.jpg 1015w, https://tech.babiel.com/wp-content/uploads/2025/03/Wuerfel_-_2021_-_4265-1-300x137.jpg 300w, https://tech.babiel.com/wp-content/uploads/2025/03/Wuerfel_-_2021_-_4265-1-768x350.jpg 768w" sizes="(max-width: 767px) 89vw, (max-width: 1000px) 54vw, (max-width: 1071px) 543px, 580px" /> </a> </div> <div class="entry-content"> <p>We are trying something new: Some how-to posts that are useful to international audiences will be published in English, so they can be shared more widely 🙂 </p> <p>We use Puppet, or rather the <a href="https://voxpupuli.org/openvox/">OpenVox fork</a>, as a our configuration management software for Linux machines.</p> <p>Sometimes there are changes you do not want to immediately roll out everywhere, but rather step by step and slowly. <a href="https://www.puppet.com/docs/puppet/8/environments_about.html">One way to do this in Puppet is using environments</a>: some machines will receive their configuration from a different Git branch. For manual testing on a handful of machines this is sufficient. But what if you have a change that you want to roll out to an increasing number of machines until you hit 100%? Environments are not a great fit:</p> <a href="https://tech.babiel.com/puppet-openvox-easy-incremental-rollout/#more-458" class="more-link"><span class="screen-reader-text">„Puppet/OpenVox: easy incremental rollout“</span> weiterlesen</a> </div> </article> <article id="post-446" class="post-446 post type-post status-publish format-standard has-post-thumbnail hentry category-uncategorized"> <header class="entry-header"> <div class="entry-meta"><span class="screen-reader-text">Veröffentlicht am</span> <a href="https://tech.babiel.com/das-mysterium-des-container-image-digests-eb37f58646a901dc7727cf448cae36daaefaba79de33b5058dab79aa4c04aefb/" rel="bookmark"><time class="entry-date published" datetime="2025-01-16T17:04:38+02:00">16. Januar 2025</time><time class="updated" datetime="2025-03-10T17:27:53+02:00">10. März 2025</time></a></div><h3 class="entry-title"><a href="https://tech.babiel.com/das-mysterium-des-container-image-digests-eb37f58646a901dc7727cf448cae36daaefaba79de33b5058dab79aa4c04aefb/" rel="bookmark">Das Mysterium des Container-Image-Digests eb37f58646a901dc7727cf448cae36daaefaba79de33b5058dab79aa4c04aefb</a></h3> </header> <div class="post-thumbnail"> <a href="https://tech.babiel.com/das-mysterium-des-container-image-digests-eb37f58646a901dc7727cf448cae36daaefaba79de33b5058dab79aa4c04aefb/"> <img width="646" height="357" src="https://tech.babiel.com/wp-content/uploads/2025/01/header.jpg" class="attachment-twentyseventeen-featured-image size-twentyseventeen-featured-image wp-post-image" alt="" decoding="async" loading="lazy" srcset="https://tech.babiel.com/wp-content/uploads/2025/01/header.jpg 646w, https://tech.babiel.com/wp-content/uploads/2025/01/header-300x166.jpg 300w" sizes="(max-width: 767px) 89vw, (max-width: 1000px) 54vw, (max-width: 1071px) 543px, 580px" /> </a> </div> <div class="entry-content"> <p><a href="https://docs.renovatebot.com/modules/datasource/docker/">Wir benutzen Renovate um alle Stellen, an denen wir Container-Images verwenden (z.B. Kubernetes-Manifeste, Puppet-Code und Gitlab-Pipelines), aktuell zu halten. </a> Renovate sammelt Image-Referenzen aus allen unseren Repos, prüft dann die entsprechende Container-Registry auf neue Versionen der jeweiligen Images und ändert die Angabe im Repo.</p> <h2 class="wp-block-heading">no matching manifest for linux/amd64</h2> <p>Dabei haben wir eine sehr seltsame Feststellung gemacht. Renovate hat z.B. diese Änderung gemacht:</p> <div class="wp-block-group is-nowrap is-layout-flex wp-container-core-group-is-layout-1 wp-block-group-is-layout-flex"> <figure class="wp-block-image size-large"><img loading="lazy" decoding="async" width="1024" height="64" src="https://tech.babiel.com/wp-content/uploads/2025/01/Bildschirmfoto-2025-01-15-um-11.07.30-1024x64.png" alt="Screenshot eines Diff. - docker:27.0.3-dind@sha256:8dc34457f4b09038cf8990b4503fea4a65d879fbba9eceb788f1342217e7c848 wird ersetzt durch - docker:27.1.0-dind@sha256:eb37f58646a901dc7727cf448cae36daaefaba79de33b5058dab79aa4c04aefb " class="wp-image-447" srcset="https://tech.babiel.com/wp-content/uploads/2025/01/Bildschirmfoto-2025-01-15-um-11.07.30-1024x64.png 1024w, https://tech.babiel.com/wp-content/uploads/2025/01/Bildschirmfoto-2025-01-15-um-11.07.30-300x19.png 300w, https://tech.babiel.com/wp-content/uploads/2025/01/Bildschirmfoto-2025-01-15-um-11.07.30-768x48.png 768w, https://tech.babiel.com/wp-content/uploads/2025/01/Bildschirmfoto-2025-01-15-um-11.07.30-1536x95.png 1536w, https://tech.babiel.com/wp-content/uploads/2025/01/Bildschirmfoto-2025-01-15-um-11.07.30.png 1612w" sizes="auto, (max-width: 767px) 89vw, (max-width: 1000px) 54vw, (max-width: 1071px) 543px, 580px" /></figure> </div> <p>Aber bei der Ausführung gab es einen Fehler:</p> <pre class="wp-block-code has-small-font-size"><code>ERROR: Job failed: failed to pull image "docker:27.1.0-dind@sha256:eb37f58646a901dc7727cf448cae36daaefaba79de33b5058dab79aa4c04aefb" with specified policies [if-not-present]: no matching manifest for linux/amd64 in the manifest list entries (manager.go:250:0s)</code></pre> <p>OK, es ist kein Image für linux/amd64 mehr enthalten? Wir haben ja gehört, dass ARM populärer wird für Server, aber dass Docker plötzlich ihre Images nicht mehr für AMD64 anbietet, wäre dann doch eine Überraschung. Allerdings: linux/arm64 wird auch nicht unterstützt:</p> <pre class="wp-block-code has-small-font-size"><code>docker: no matching manifest for linux/arm64/v8 in the manifest list entries.</code></pre> <p>Es wurde noch seltsamer: Der Digest des Image, eb37f58646a901dc7727cf448cae36daaefaba79de33b5058dab79aa4c04aefb, tauchte auch bei anderen Image-Versionen und völlig anderen Images auf:</p> <ul class="wp-block-list"> <li>docker:27.1.1</li> <li>docker:27.1.1-dind</li> <li>wordpress:6.6.1</li> <li>rabbitmq:3.13.1-management</li> </ul> <p>Was war hier los?</p> <a href="https://tech.babiel.com/das-mysterium-des-container-image-digests-eb37f58646a901dc7727cf448cae36daaefaba79de33b5058dab79aa4c04aefb/#more-446" class="more-link"><span class="screen-reader-text">„Das Mysterium des Container-Image-Digests eb37f58646a901dc7727cf448cae36daaefaba79de33b5058dab79aa4c04aefb“</span> weiterlesen</a> </div> </article> <article id="post-433" class="post-433 post type-post status-publish format-standard has-post-thumbnail hentry category-uncategorized"> <header class="entry-header"> <div class="entry-meta"><span class="screen-reader-text">Veröffentlicht am</span> <a href="https://tech.babiel.com/mysql-deadlock-finden-flamegraph-ohne-profiling/" rel="bookmark"><time class="entry-date published" datetime="2024-11-28T10:48:49+02:00">28. November 2024</time><time class="updated" datetime="2024-11-28T10:49:33+02:00">28. November 2024</time></a></div><h3 class="entry-title"><a href="https://tech.babiel.com/mysql-deadlock-finden-flamegraph-ohne-profiling/" rel="bookmark">MySQL-Deadlock finden — Flamegraph ohne Profiling</a></h3> </header> <div class="post-thumbnail"> <a href="https://tech.babiel.com/mysql-deadlock-finden-flamegraph-ohne-profiling/"> <img width="2000" height="974" src="https://tech.babiel.com/wp-content/uploads/2024/11/Bildschirmfoto-2024-11-25-um-14.22.05-2000x974.png" class="attachment-twentyseventeen-featured-image size-twentyseventeen-featured-image wp-post-image" alt="Ein Flamegraph aus dem sich kein klares Bild ergibt" decoding="async" loading="lazy" sizes="(max-width: 767px) 89vw, (max-width: 1000px) 54vw, (max-width: 1071px) 543px, 580px" /> </a> </div> <div class="entry-content"> <p>Wir hatten ein seltsames Problem in einem unserer MySQL-Cluster: Die primäre Node konnte keine neuen Verbindungen mehr annehmen. Die Verbindungen wurden nicht abgelehnt, aber sie wurden auch nicht vollständig aufgebaut. </p> <p>Ein Restart von mysqld hat das Problem gelöst – aber wir haben uns gefragt, was da passiert ist. Daher war eine der Maßnahmen im Post-Mortem, dass wir für die Zukunft dokumentieren, wie man Stacktrace aller MySQL-Threads dumpen kann.</p> <p>Als das Problem kurz später noch mal auftrat, waren wir vorbereitet: Wir haben einen Coredump erstellt und uns dann mit gdb die Threads angesehen:</p> <a href="https://tech.babiel.com/mysql-deadlock-finden-flamegraph-ohne-profiling/#more-433" class="more-link"><span class="screen-reader-text">„MySQL-Deadlock finden — Flamegraph ohne Profiling“</span> weiterlesen</a> </div> </article> <article id="post-418" class="post-418 post type-post status-publish format-standard has-post-thumbnail hentry category-uncategorized tag-earthly tag-mtail tag-prometheus tag-testing"> <header class="entry-header"> <div class="entry-meta"><span class="screen-reader-text">Veröffentlicht am</span> <a href="https://tech.babiel.com/mtail-testen-mit-golden-files/" rel="bookmark"><time class="entry-date published" datetime="2024-09-18T10:27:15+02:00">18. September 2024</time><time class="updated" datetime="2024-09-20T12:45:25+02:00">20. September 2024</time></a></div><h3 class="entry-title"><a href="https://tech.babiel.com/mtail-testen-mit-golden-files/" rel="bookmark">mtail testen mit Golden Files</a></h3> </header> <div class="post-thumbnail"> <a href="https://tech.babiel.com/mtail-testen-mit-golden-files/"> <img width="640" height="453" src="https://tech.babiel.com/wp-content/uploads/2024/09/640px-Mobile_car_testing_unit.jpg" class="attachment-twentyseventeen-featured-image size-twentyseventeen-featured-image wp-post-image" alt="" decoding="async" loading="lazy" srcset="https://tech.babiel.com/wp-content/uploads/2024/09/640px-Mobile_car_testing_unit.jpg 640w, https://tech.babiel.com/wp-content/uploads/2024/09/640px-Mobile_car_testing_unit-300x212.jpg 300w" sizes="(max-width: 767px) 89vw, (max-width: 1000px) 54vw, (max-width: 1071px) 543px, 580px" /> </a> </div> <div class="entry-content"> <p><a href="https://tech.babiel.com/prometheus-metriken-fuer-puppet-server-mit-mtail/" data-type="post" data-id="101">Wie wir bereits beschrieben haben, benutzen wir mtail um Prometheus-Metrics aus Logs zu erzeugen. </a></p> <p><a href="https://google.github.io/mtail/Language.html">mtail-Programme enthalten Patterns für konkrete Logzeilen, aus denen die Metrics entstehen</a>.</p> <p>Wie alle Programme können solche für mtail natürlich auch Fehler enthalten. Deswegen wollen wir dafür gerne, wie für andere Programme auch, automatische Tests haben. Dann können wir mindestens bekannte Fehler ausschließen. Tests schaffen auch Sicherheit bei Refactorings, dass man keine Funktionalität kaputt gemacht hat durch Änderungen.</p> <a href="https://tech.babiel.com/mtail-testen-mit-golden-files/#more-418" class="more-link"><span class="screen-reader-text">„mtail testen mit Golden Files“</span> weiterlesen</a> </div> </article> <article id="post-401" class="post-401 post type-post status-publish format-standard has-post-thumbnail hentry category-uncategorized tag-go tag-haproxy"> <header class="entry-header"> <div class="entry-meta"><span class="screen-reader-text">Veröffentlicht am</span> <a href="https://tech.babiel.com/structural-diff-for-haproxy-configuration/" rel="bookmark"><time class="entry-date published" datetime="2024-03-28T13:27:03+02:00">28. März 2024</time><time class="updated" datetime="2024-03-28T14:05:31+02:00">28. März 2024</time></a></div><h3 class="entry-title"><a href="https://tech.babiel.com/structural-diff-for-haproxy-configuration/" rel="bookmark">Structural diff for HAProxy configuration</a></h3> </header> <div class="post-thumbnail"> <a href="https://tech.babiel.com/structural-diff-for-haproxy-configuration/"> <img width="678" height="40" src="https://tech.babiel.com/wp-content/uploads/2024/02/Gerrit-diff-context.png" class="attachment-twentyseventeen-featured-image size-twentyseventeen-featured-image wp-post-image" alt="" decoding="async" loading="lazy" srcset="https://tech.babiel.com/wp-content/uploads/2024/02/Gerrit-diff-context.png 678w, https://tech.babiel.com/wp-content/uploads/2024/02/Gerrit-diff-context-300x18.png 300w" sizes="(max-width: 767px) 89vw, (max-width: 1000px) 54vw, (max-width: 1071px) 543px, 580px" /> </a> </div> <div class="entry-content"> <p>(This is an English translation of <a href="https://tech.babiel.com/haproxy-konfiguration-strukturell-diffen/">a previous post</a>)</p> <p>We use HAProxy for all our incoming HTTP and other TCP connections.</p> <p>Its configuration is the most complex we have. That’s why we do not write it by hand, but rather generate it from metadata and includes. Such a generator makes the configuration easier — but it also makes it harder to see what the actual changes will be in the end.</p> <p>For situations like that, we like tooling that will show us a diff of the <em>generated</em> configuration. Because the HAProxy configuration is a single text file, we could use <a href="https://manpages.debian.org/bookworm/diffutils/diff.1.en.html">the diff program</a> to compare two versions.</p> <p>The downside of a textual diff is that it shows meaningless differences, for example if only order or comments change.</p> <a href="https://tech.babiel.com/structural-diff-for-haproxy-configuration/#more-401" class="more-link"><span class="screen-reader-text">„Structural diff for HAProxy configuration“</span> weiterlesen</a> </div> </article> <article id="post-386" class="post-386 post type-post status-publish format-standard has-post-thumbnail hentry category-uncategorized tag-go tag-haproxy tag-linux"> <header class="entry-header"> <div class="entry-meta"><span class="screen-reader-text">Veröffentlicht am</span> <a href="https://tech.babiel.com/haproxy-konfiguration-strukturell-diffen/" rel="bookmark"><time class="entry-date published" datetime="2024-02-27T17:42:27+02:00">27. Februar 2024</time><time class="updated" datetime="2024-03-28T13:32:09+02:00">28. März 2024</time></a></div><h3 class="entry-title"><a href="https://tech.babiel.com/haproxy-konfiguration-strukturell-diffen/" rel="bookmark">HAProxy-Konfiguration strukturell diffen</a></h3> </header> <div class="post-thumbnail"> <a href="https://tech.babiel.com/haproxy-konfiguration-strukturell-diffen/"> <img width="678" height="40" src="https://tech.babiel.com/wp-content/uploads/2024/02/Gerrit-diff-context.png" class="attachment-twentyseventeen-featured-image size-twentyseventeen-featured-image wp-post-image" alt="" decoding="async" loading="lazy" srcset="https://tech.babiel.com/wp-content/uploads/2024/02/Gerrit-diff-context.png 678w, https://tech.babiel.com/wp-content/uploads/2024/02/Gerrit-diff-context-300x18.png 300w" sizes="(max-width: 767px) 89vw, (max-width: 1000px) 54vw, (max-width: 1071px) 543px, 580px" /> </a> </div> <div class="entry-content"> <p>(This post is also available <a href="https://tech.babiel.com/structural-diff-for-haproxy-configuration/">in English</a>)</p> <p>Wir benutzen HAProxy für alle unsere eingehenden HTTP- und sonstigen TCP-Verbindungen. </p> <p>Die Konfiguration ist die komplexeste, die wir haben. Daher wird die Konfiguration nicht von Hand erstellt, sondern aus Metadaten und Includes generiert. Ein solcher Generator vereinfacht die Konfiguration — aber kann es erschweren zu sehen, was man nun wirklich ändert.</p> <p>Für solche Fälle mögen wir Tooling, dass uns einen Diff der <em>generierten</em> Konfiguration anzeigen kann. Da die HAProxy-Konfiguration eine einzelne Textdatei ist, könnten wir <a href="https://manpages.debian.org/bookworm/diffutils/diff.1.en.html">das diff-Programm</a> benutzen um zwei Versionen zu vergleichen.</p> <p>Das Problem mit einem rein textuellen Diff ist, dass dort auch Unterschiede auftauchen, die gar keine Auswirkung auf HAProxy haben, z.B. wenn sich nur die Reihenfolge oder Kommentare ändern.</p> <a href="https://tech.babiel.com/haproxy-konfiguration-strukturell-diffen/#more-386" class="more-link"><span class="screen-reader-text">„HAProxy-Konfiguration strukturell diffen“</span> weiterlesen</a> </div> </article> <article id="post-374" class="post-374 post type-post status-publish format-standard has-post-thumbnail hentry category-uncategorized"> <header class="entry-header"> <div class="entry-meta"><span class="screen-reader-text">Veröffentlicht am</span> <a href="https://tech.babiel.com/kubernetes-local-persistent-volumes-mit-virtio-disks/" rel="bookmark"><time class="entry-date published updated" datetime="2023-12-01T12:07:47+02:00">1. Dezember 2023</time></a></div><h3 class="entry-title"><a href="https://tech.babiel.com/kubernetes-local-persistent-volumes-mit-virtio-disks/" rel="bookmark">Kubernetes Local Persistent Volumes mit virtio-Disks</a></h3> </header> <div class="post-thumbnail"> <a href="https://tech.babiel.com/kubernetes-local-persistent-volumes-mit-virtio-disks/"> <img width="1024" height="683" src="https://tech.babiel.com/wp-content/uploads/2023/11/Forty_years_of_Removable_Storage.jpg" class="attachment-twentyseventeen-featured-image size-twentyseventeen-featured-image wp-post-image" alt="" decoding="async" loading="lazy" srcset="https://tech.babiel.com/wp-content/uploads/2023/11/Forty_years_of_Removable_Storage.jpg 1024w, https://tech.babiel.com/wp-content/uploads/2023/11/Forty_years_of_Removable_Storage-300x200.jpg 300w, https://tech.babiel.com/wp-content/uploads/2023/11/Forty_years_of_Removable_Storage-768x512.jpg 768w" sizes="(max-width: 767px) 89vw, (max-width: 1000px) 54vw, (max-width: 1071px) 543px, 580px" /> </a> </div> <div class="entry-content"> <p>In Kubernetes ermöglichen <a href="https://kubernetes.io/docs/concepts/storage/persistent-volumes/">Persistent Volumes</a> (PVs) den Betrieb von Workloads mit persistentem State. Der Inhalt dieser Volumes existiert unabhängig von der Lebensdauer der Pods, die sie verwenden.</p> <p><a href="https://kubernetes-csi.github.io/docs/drivers.html">Es gibt viele verschiedene Implementierungen/Provider für PVs</a>. Wenn man Kubernetes bei einem Cloud-Anbieter betreibt, kann man deren Blockdevice- oder Netzwerkdateisystem-Service verwenden, z.B. <a href="https://aws.amazon.com/de/ebs/">Elastic Block Store (EBS) bei AWS</a>. </p> <p>Auch in einer on-prem-Umgebung wie unserer gibt es Möglichkeiten: die meisten unserer Persistent Volumes liegen auf NetApps. Mit <a href="https://docs.netapp.com/us-en/netapp-solutions/containers/rh-os-n_overview_trident.html">dem offiziellen NetApp-Provisioner Trident</a> werden diese bei Bedarf automatisch angelegt.</p> <p>In manchen Fällen möchte man aber nicht Volumes per Netzwerk einbinden, sondern diese direkt auf der Node haben, d.h. Local Storage nutzen. Das kann z.B. schneller oder kostengünstiger sein, und hat weniger Abhängigkeiten. Es passt insbesondere dann, wenn die Redundanz der Daten auf Anwendungsebene sichergestellt ist, so dass ein Verlust eines einzelnen PVs keinen Datenverlust bedeutet.</p> <p><a href="https://kubernetes.io/docs/concepts/storage/persistent-volumes/">Pods verwenden die PVs nicht direkt, sondern sie referenzieren einen Persistent Volume Claim (PVC)</a>. Ein PVC ist ein „Wunsch“ nach einem Volume einer bestimmter Art und Größe. <a href="https://kubernetes.io/docs/concepts/storage/persistent-volumes/#binding">Eine Controller-Loop in Kubernetes sorgt dafür, dass ein PVC mit einem passenden PV verknüpft wird</a>. Erst dann kann das PVC von Pods verwendet werden.</p> <p>Für die meisten Arten von Volumes gibt es <a href="https://kubernetes.io/docs/concepts/storage/persistent-volumes/#dynamic">dynamisches Provisioning: wenn jemand ein PVC erstellt, wird automatisch vom Hersteller-spezifischen Provisioner (wie NetApp Trident) ein passendes PV erstellt</a>. Da das neue PV genau auf das PVC passt, werden diese dann von Kubernetes verknüpft. </p> <p>Bei den local Volumes gibt es stattdessen ein statisches Provisioning: der <a href="https://github.com/kubernetes-sigs/sig-storage-local-static-provisioner">local-static-provisioner</a> scannt nur auf der jeweiligen Node, wo er läuft, nach schon bestehenden Mountpoints oder Blockdevices, und erstellt dafür die PV-Objekte. Wenn man also ein PVC anlegt, und es gar kein passendes PV gibt, dann wird das PVC pending bleiben, bis man selbst ein Volume erstellt.</p> <a href="https://tech.babiel.com/kubernetes-local-persistent-volumes-mit-virtio-disks/#more-374" class="more-link"><span class="screen-reader-text">„Kubernetes Local Persistent Volumes mit virtio-Disks“</span> weiterlesen</a> </div> </article> <article id="post-351" class="post-351 post type-post status-publish format-standard has-post-thumbnail hentry category-uncategorized tag-ci-cd tag-debian tag-devops tag-earthly tag-gitlab tag-linux tag-nfpm tag-renovate"> <header class="entry-header"> <div class="entry-meta"><span class="screen-reader-text">Veröffentlicht am</span> <a href="https://tech.babiel.com/linux-packages-erstellen-aus-fertigen-binaries-mit-automatischen-updates/" rel="bookmark"><time class="entry-date published" datetime="2023-10-13T13:27:05+02:00">13. Oktober 2023</time><time class="updated" datetime="2023-10-13T13:28:26+02:00">13. Oktober 2023</time></a></div><h3 class="entry-title"><a href="https://tech.babiel.com/linux-packages-erstellen-aus-fertigen-binaries-mit-automatischen-updates/" rel="bookmark">Linux-Packages erstellen aus fertigen Binaries – mit automatischen Updates</a></h3> </header> <div class="post-thumbnail"> <a href="https://tech.babiel.com/linux-packages-erstellen-aus-fertigen-binaries-mit-automatischen-updates/"> <img width="1024" height="683" src="https://tech.babiel.com/wp-content/uploads/2023/10/Eco-friendly_cardboard_packaging_for_takeaways.jpg" class="attachment-twentyseventeen-featured-image size-twentyseventeen-featured-image wp-post-image" alt="" decoding="async" loading="lazy" srcset="https://tech.babiel.com/wp-content/uploads/2023/10/Eco-friendly_cardboard_packaging_for_takeaways.jpg 1024w, https://tech.babiel.com/wp-content/uploads/2023/10/Eco-friendly_cardboard_packaging_for_takeaways-300x200.jpg 300w, https://tech.babiel.com/wp-content/uploads/2023/10/Eco-friendly_cardboard_packaging_for_takeaways-768x512.jpg 768w" sizes="(max-width: 767px) 89vw, (max-width: 1000px) 54vw, (max-width: 1071px) 543px, 580px" /> </a> </div> <div class="entry-content"> <p>Man kennt das Problem: in der Linux-Distribution der Wahl ist eine gewünschte Software nicht als Paket verfügbar, oder nicht in der Version, die man braucht/möchte. </p> <p>Früher™ hätte man häufig selbst kompilieren müssen. Heutzutage, und insbesondere mit Programmiersprachen wie <a href="https://go.dev">Go</a> oder Java, aus denen (fast) statische Binaries/JARs fallen, stellen viele Upstreams eigene Binaries für ihre Programme bereit. Mit etwas Glück auch in Form von DEBs oder RPMs – aber leider nicht immer.</p> <a href="https://tech.babiel.com/linux-packages-erstellen-aus-fertigen-binaries-mit-automatischen-updates/#more-351" class="more-link"><span class="screen-reader-text">„Linux-Packages erstellen aus fertigen Binaries – mit automatischen Updates“</span> weiterlesen</a> </div> </article> <article id="post-316" class="post-316 post type-post status-publish format-standard has-post-thumbnail hentry category-uncategorized tag-babiel tag-haproxy tag-loadbalancer tag-nginx tag-scrubbing tag-varnish"> <header class="entry-header"> <div class="entry-meta"><span class="screen-reader-text">Veröffentlicht am</span> <a href="https://tech.babiel.com/health-check-cache-fuer-http-backends/" rel="bookmark"><time class="entry-date published" datetime="2023-06-01T11:04:46+02:00">1. Juni 2023</time><time class="updated" datetime="2023-06-01T11:05:16+02:00">1. Juni 2023</time></a></div><h3 class="entry-title"><a href="https://tech.babiel.com/health-check-cache-fuer-http-backends/" rel="bookmark">Health-Check-Cache für HTTP-Backends</a></h3> </header> <div class="post-thumbnail"> <a href="https://tech.babiel.com/health-check-cache-fuer-http-backends/"> <img width="1024" height="577" src="https://tech.babiel.com/wp-content/uploads/2023/05/Peechi_Dam_3.jpg" class="attachment-twentyseventeen-featured-image size-twentyseventeen-featured-image wp-post-image" alt="" decoding="async" loading="lazy" srcset="https://tech.babiel.com/wp-content/uploads/2023/05/Peechi_Dam_3.jpg 1024w, https://tech.babiel.com/wp-content/uploads/2023/05/Peechi_Dam_3-300x169.jpg 300w, https://tech.babiel.com/wp-content/uploads/2023/05/Peechi_Dam_3-768x433.jpg 768w" sizes="(max-width: 767px) 89vw, (max-width: 1000px) 54vw, (max-width: 1071px) 543px, 580px" /> </a> </div> <div class="entry-content"> <h2 class="wp-block-heading">Was ist das, wozu brauchen wir das und was ist daran so kompliziert?</h2> <p>Ein Health-Check-Cache soll, wie der Name schon vermuten lässt, Health-Checks cachen. In Wirklichkeit passiert aber noch mehr, was für uns auch sehr wichtig ist.</p> <p>Unsere Loadbalancer laufen mit HAProxy. Dieser macht regelmäßig Health-Checks gegen die Backends. Das ist auch gut und richtig, denn er muss ja immer wissen, welches Backend tatsächlich up oder down ist, um den Traffic für den User möglichst ohne Unterbrechung oder Fehler zu lenken. Wenn man jetzt, so wie wir, sehr viele Loadbalancer hat und diese auch noch innerhalb sehr kurzer Zeit vervielfachen kann, wird das jedoch ab einem gewissen Punkt zu einem Problem und skaliert einfach nicht mehr, was die Health-Checks angeht.</p> <p>Stellen wir uns 50 Loadbalancer vor, die alle N Sekunden gegen ein und das selbe Backend prüfen. Dazu kommt der normale Traffic, der nicht aus dem Cache ausgeliefert wird, oder der gerade im Cache expired ist, plus vielleicht noch eine „nicht optimale“ Backendsoftware, die einfach nicht so viele Requests pro Sekunde schafft. Das alles in Kombination ist denkbar ungünstig. Das Ziel eines Caches ist es ja, das Backend zu entlasten und die Auslieferung bestenfalls noch zu beschleunigen. Selbiges können wir auch für Health-Checks tun. Wieso sollen alle 50 Loadbalancer einzeln ihre Health-Checks gegen die Backends fahren? Auch hier kann man das super konsolidieren, indem wir nur für die Health-Checks einen Cache betreiben und der HAProxy gegen den Cache prüft.</p> <p>Das Backend bzw. die Software können wir uns leider nicht in jedem Fall aussuchen oder so beeinflussen, dass sie für uns ausreichend performt. Also brauchen wir eine Lösung, die wir einfach überall anwenden können, unabhängig vom eigentlichen Backend. Da passt ein solcher Cache sehr gut ins Konzept.</p> <a href="https://tech.babiel.com/health-check-cache-fuer-http-backends/#more-316" class="more-link"><span class="screen-reader-text">„Health-Check-Cache für HTTP-Backends“</span> weiterlesen</a> </div> </article> <article id="post-306" class="post-306 post type-post status-publish format-standard has-post-thumbnail hentry category-engineering tag-api tag-go tag-sms"> <header class="entry-header"> <div class="entry-meta"><span class="screen-reader-text">Veröffentlicht am</span> <a href="https://tech.babiel.com/unsere-interne-api-fuer-sms-versand/" rel="bookmark"><time class="entry-date published" datetime="2023-05-02T17:56:30+02:00">2. Mai 2023</time><time class="updated" datetime="2023-05-11T10:25:56+02:00">11. Mai 2023</time></a></div><h3 class="entry-title"><a href="https://tech.babiel.com/unsere-interne-api-fuer-sms-versand/" rel="bookmark">Unsere interne API für SMS-Versand</a></h3> </header> <div class="post-thumbnail"> <a href="https://tech.babiel.com/unsere-interne-api-fuer-sms-versand/"> <img width="1179" height="430" src="https://tech.babiel.com/wp-content/uploads/2023/04/Image2.png" class="attachment-twentyseventeen-featured-image size-twentyseventeen-featured-image wp-post-image" alt="" decoding="async" loading="lazy" srcset="https://tech.babiel.com/wp-content/uploads/2023/04/Image2.png 1179w, https://tech.babiel.com/wp-content/uploads/2023/04/Image2-300x109.png 300w, https://tech.babiel.com/wp-content/uploads/2023/04/Image2-1024x373.png 1024w, https://tech.babiel.com/wp-content/uploads/2023/04/Image2-768x280.png 768w" sizes="(max-width: 767px) 89vw, (max-width: 1000px) 54vw, (max-width: 1071px) 543px, 580px" /> </a> </div> <div class="entry-content"> <p>Bei uns gibt es einige Anwendungen, die SMS verschicken:</p> <ul class="wp-block-list"> <li>Icinga verschickt Monitoring-Alerts</li> <li>ein 2FA-Service verschickt Login-TANs</li> <li>Jira verschickt Alerts für bestimmte Tickets</li> </ul> <p>Bis vor kurzem haben wir dafür Hardware-Maschinen mit Mobilfunk-Modems betrieben. </p> <p>Das hatte leider einige Nachteile:</p> <ul class="wp-block-list"> <li>Diese Maschinen brauchen spezialisierte Hardware und können nicht virtualisiert werden</li> <li>Aufwand bei Updates; insbesondere hatten wir einen gepatchten gsmmuxd</li> </ul> <p>Unser Ziel war es, diese Maschinen loszuwerden. Um weiterhin SMS versenden zu können, brauchten wir also einen externen Dienstleister mit einer API.</p> <h2 class="wp-block-heading">Die neue API</h2> <p>Wir wollten uns bei der neuen Lösung nicht fest an einen Anbieter binden. In den Begriffen der Softwareentwicklung würde man sagen: wir wollen <a href="https://en.wikipedia.org/wiki/Loose_coupling">Loose Coupling</a>.</p> <p>Deswegen haben wir eine interne API geschaffen, die zwischen unseren Anwendungen und dem Versender steht. Diese API ist ein stabiles Interface; worüber eine SMS versendet wird ist dann nur ein Implementierungsdetail.</p> <a href="https://tech.babiel.com/unsere-interne-api-fuer-sms-versand/#more-306" class="more-link"><span class="screen-reader-text">„Unsere interne API für SMS-Versand“</span> weiterlesen</a> </div> </article> <nav class="navigation pagination" aria-label="Seitennummerierung der Beiträge"> <h2 class="screen-reader-text">Seitennummerierung der Beiträge</h2> <div class="nav-links"><span aria-current="page" class="page-numbers current"><span class="meta-nav screen-reader-text">Seite </span>1</span> <a class="page-numbers" href="https://tech.babiel.com/page/2/"><span class="meta-nav screen-reader-text">Seite </span>2</a> <a class="next page-numbers" href="https://tech.babiel.com/page/2/"><span class="screen-reader-text">Nächste Seite</span><svg class="icon icon-arrow-right" aria-hidden="true" role="img"> <use href="#icon-arrow-right" xlink:href="#icon-arrow-right"></use> </svg></a></div> </nav> </main> </div> </div> </div> <footer id="colophon" class="site-footer"> <div class="wrap"> <aside class="widget-area" aria-label="Footer"> <div class="widget-column footer-widget-1"> <section id="block-8" class="widget widget_block"><h2 class="widget-title">Neueste Beiträge</h2><div class="wp-widget-group__inner-blocks"><ul class="wp-block-latest-posts__list has-dates wp-block-latest-posts"><li><a class="wp-block-latest-posts__post-title" href="https://tech.babiel.com/puppet-openvox-easy-incremental-rollout/">Puppet/OpenVox: easy incremental rollout</a><time datetime="2025-03-10T11:44:34+02:00" class="wp-block-latest-posts__post-date">10. 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