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aria-expanded="false" type="button" class="clean-btn menu__caret"></button></div></li></ul></nav></div></div></aside><main class="docMainContainer_TBSr"><div class="container padding-top--md padding-bottom--lg"><div class="row"><div class="col docItemCol_VOVn"><div class="docItemContainer_Djhp"><article><nav class="theme-doc-breadcrumbs breadcrumbsContainer_Z_bl" aria-label="Breadcrumbs"><ul class="breadcrumbs"><li class="breadcrumbs__item"><a aria-label="Home page" class="breadcrumbs__link" href="/constellation/"><svg viewBox="0 0 24 24" class="breadcrumbHomeIcon_YNFT"><path d="M10 19v-5h4v5c0 .55.45 1 1 1h3c.55 0 1-.45 1-1v-7h1.7c.46 0 .68-.57.33-.87L12.67 3.6c-.38-.34-.96-.34-1.34 0l-8.36 7.53c-.34.3-.13.87.33.87H5v7c0 .55.45 1 1 1h3c.55 0 1-.45 1-1z" fill="currentColor"></path></svg></a></li><li class="breadcrumbs__item"><a class="breadcrumbs__link" href="/constellation/category/workflows"><span>Workflows</span></a></li><li class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link">Scale your cluster</span></li></ul></nav><span class="theme-doc-version-badge badge badge--secondary">Version: 2.24</span><div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_ITEo"><button type="button" class="clean-btn tocCollapsibleButton_TO0P">On this page</button></div><div class="theme-doc-markdown markdown"><header><h1>Scale your cluster</h1></header>
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<p>Constellation provides all features of a Kubernetes cluster including scaling and autoscaling.</p>
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<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id="worker-node-scaling">Worker node scaling<a href="#worker-node-scaling" class="hash-link" aria-label="Direct link to Worker node scaling" title="Direct link to Worker node scaling" translate="no"></a></h2>
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<h3 class="anchor anchorTargetStickyNavbar_Vzrq" id="autoscaling">Autoscaling<a href="#autoscaling" class="hash-link" aria-label="Direct link to Autoscaling" title="Direct link to Autoscaling" translate="no"></a></h3>
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<p>Constellation comes with autoscaling disabled by default. To enable autoscaling, find the scaling group of
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worker nodes:</p>
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<div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_QJqH"><pre tabindex="0" class="prism-code language-bash codeBlock_bY9V thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token plain">kubectl get scalinggroups -o json | yq '.items | .[] | select(.spec.role == "Worker") | [{"name": .metadata.name, "nodeGoupName": .spec.nodeGroupName}]'</span><br></span></code></pre></div></div>
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<p>This will output a list of scaling groups with the corresponding cloud provider name (<code>name</code>) and the cloud provider agnostic name of the node group (<code>nodeGroupName</code>).</p>
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<p>Then, patch the <code>autoscaling</code> field of the scaling group resource with the desired <code>name</code> to <code>true</code>:</p>
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<div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_QJqH"><pre tabindex="0" class="prism-code language-bash codeBlock_bY9V thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token plain"># Replace <name> with the name of the scaling group you want to enable autoscaling for</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">worker_group=<name></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">kubectl patch scalinggroups $worker_group --patch '{"spec":{"autoscaling": true}}' --type='merge'</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">kubectl get scalinggroup $worker_group -o jsonpath='{.spec}' | yq -P</span><br></span></code></pre></div></div>
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<p>The cluster autoscaler now automatically provisions additional worker nodes so that all pods have a place to run.
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You can configure the minimum and maximum number of worker nodes in the scaling group by patching the <code>min</code> or
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<code>max</code> fields of the scaling group resource:</p>
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<div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_QJqH"><pre tabindex="0" class="prism-code language-bash codeBlock_bY9V thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token plain">kubectl patch scalinggroups $worker_group --patch '{"spec":{"max": 5}}' --type='merge'</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">kubectl get scalinggroup $worker_group -o jsonpath='{.spec}' | yq -P</span><br></span></code></pre></div></div>
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<p>The cluster autoscaler will now never provision more than 5 worker nodes.</p>
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<p>If you want to see the autoscaling in action, try to add a deployment with a lot of replicas, like the
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following Nginx deployment. The number of replicas needed to trigger the autoscaling depends on the size of
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and count of your worker nodes. Wait for the rollout of the deployment to finish and compare the number of
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worker nodes before and after the deployment:</p>
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<div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_QJqH"><pre tabindex="0" class="prism-code language-bash codeBlock_bY9V thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token plain">kubectl create deployment nginx --image=nginx --replicas 150</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">kubectl -n kube-system get nodes</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">kubectl rollout status deployment nginx</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">kubectl -n kube-system get nodes</span><br></span></code></pre></div></div>
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<h3 class="anchor anchorTargetStickyNavbar_Vzrq" id="manual-scaling">Manual scaling<a href="#manual-scaling" class="hash-link" aria-label="Direct link to Manual scaling" title="Direct link to Manual scaling" translate="no"></a></h3>
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<p>Alternatively, you can manually scale your cluster up or down:</p>
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<div class="theme-tabs-container tabs-container tabList__CuJ"><ul role="tablist" aria-orientation="horizontal" class="tabs"><li role="tab" tabindex="0" aria-selected="true" class="tabs__item tabItem_LNqP tabs__item--active">AWS</li><li role="tab" tabindex="-1" aria-selected="false" class="tabs__item tabItem_LNqP">Azure</li><li role="tab" tabindex="-1" aria-selected="false" class="tabs__item tabItem_LNqP">GCP</li><li role="tab" tabindex="-1" aria-selected="false" class="tabs__item tabItem_LNqP">STACKIT</li></ul><div class="margin-top--md"><div role="tabpanel" class="tabItem_Ymn6"><ol>
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<li class="">Go to Auto Scaling Groups and select the worker ASG to scale up.</li>
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<li class="">Click <strong>Edit</strong></li>
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<li class="">Set the new (increased) <strong>Desired capacity</strong> and <strong>Update</strong>.</li>
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</ol></div><div role="tabpanel" class="tabItem_Ymn6" hidden=""><ol>
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<li class="">Find your Constellation resource group.</li>
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<li class="">Select the <code>scale-set-workers</code>.</li>
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<li class="">Go to <strong>settings</strong> and <strong>scaling</strong>.</li>
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<li class="">Set the new <strong>instance count</strong> and <strong>save</strong>.</li>
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</ol></div><div role="tabpanel" class="tabItem_Ymn6" hidden=""><ol>
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<li class="">In Compute Engine go to <a href="https://console.cloud.google.com/compute/instanceGroups/" target="_blank" rel="noopener noreferrer" class="">Instance Groups</a>.</li>
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<li class=""><strong>Edit</strong> the <strong>worker</strong> instance group.</li>
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<li class="">Set the new <strong>number of instances</strong> and <strong>save</strong>.</li>
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</ol></div><div role="tabpanel" class="tabItem_Ymn6" hidden=""><p>Dynamic cluster scaling isn't yet supported for STACKIT.
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Support will be introduced in one of the upcoming releases.</p></div></div></div>
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<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id="control-plane-node-scaling">Control-plane node scaling<a href="#control-plane-node-scaling" class="hash-link" aria-label="Direct link to Control-plane node scaling" title="Direct link to Control-plane node scaling" translate="no"></a></h2>
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<p>Control-plane nodes can <strong>only be scaled manually and only scaled up</strong>!</p>
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<p>To increase the number of control-plane nodes, follow these steps:</p>
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<div class="theme-tabs-container tabs-container tabList__CuJ"><ul role="tablist" aria-orientation="horizontal" class="tabs"><li role="tab" tabindex="0" aria-selected="true" class="tabs__item tabItem_LNqP tabs__item--active">AWS</li><li role="tab" tabindex="-1" aria-selected="false" class="tabs__item tabItem_LNqP">Azure</li><li role="tab" tabindex="-1" aria-selected="false" class="tabs__item tabItem_LNqP">GCP</li><li role="tab" tabindex="-1" aria-selected="false" class="tabs__item tabItem_LNqP">STACKIT</li></ul><div class="margin-top--md"><div role="tabpanel" class="tabItem_Ymn6"><ol>
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<li class="">Go to Auto Scaling Groups and select the control-plane ASG to scale up.</li>
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<li class="">Click <strong>Edit</strong></li>
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<li class="">Set the new (increased) <strong>Desired capacity</strong> and <strong>Update</strong>.</li>
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</ol></div><div role="tabpanel" class="tabItem_Ymn6" hidden=""><ol>
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<li class="">Find your Constellation resource group.</li>
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<li class="">Select the <code>scale-set-controlplanes</code>.</li>
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<li class="">Go to <strong>settings</strong> and <strong>scaling</strong>.</li>
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<li class="">Set the new (increased) <strong>instance count</strong> and <strong>save</strong>.</li>
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</ol></div><div role="tabpanel" class="tabItem_Ymn6" hidden=""><ol>
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<li class="">In Compute Engine go to <a href="https://console.cloud.google.com/compute/instanceGroups/" target="_blank" rel="noopener noreferrer" class="">Instance Groups</a>.</li>
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<li class=""><strong>Edit</strong> the <strong>control-plane</strong> instance group.</li>
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<li class="">Set the new (increased) <strong>number of instances</strong> and <strong>save</strong>.</li>
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</ol></div><div role="tabpanel" class="tabItem_Ymn6" hidden=""><p>Dynamic cluster scaling isn't yet supported for STACKIT.
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Support will be introduced in one of the upcoming releases.</p></div></div></div>
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<p>If you scale down the number of control-planes nodes, the removed nodes won't be able to exit the <code>etcd</code> cluster correctly. This will endanger the quorum that's required to run a stable Kubernetes control plane.</p></div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="row margin-top--sm theme-doc-footer-edit-meta-row"><div class="col noPrint_WFHX"><a href="https://github.com/edgelesssys/constellation/edit/main/docs/versioned_docs/version-2.24/workflows/scale.md" target="_blank" rel="noopener noreferrer" class="theme-edit-this-page"><svg fill="currentColor" height="20" width="20" viewBox="0 0 40 40" class="iconEdit_Z9Sw" aria-hidden="true"><g><path d="m34.5 11.7l-3 3.1-6.3-6.3 3.1-3q0.5-0.5 1.2-0.5t1.1 0.5l3.9 3.9q0.5 0.4 0.5 1.1t-0.5 1.2z m-29.5 17.1l18.4-18.5 6.3 6.3-18.4 18.4h-6.3v-6.2z"></path></g></svg>Edit this page</a></div><div class="col lastUpdated_JAkA"></div></div></footer></article><nav class="docusaurus-mt-lg pagination-nav" aria-label="Docs pages"><a class="pagination-nav__link pagination-nav__link--prev" href="/constellation/workflows/create"><div 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