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<p><a href="elma365-on-premises.html">BRIX On-Premises</a> > <a href="elma365-enterprise.html">BRIX On-Premises Enterprise</a> > Install add-on components for BRIX / Install Descheduler</p>
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<div class="topic__title"><h1 class="p_Heading1"><span class="f_Heading1">Install Descheduler</span></h1>
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<p class="p_Normal">The Descheduler is used for redistributing workloads among the nodes of a Kubernetes cluster by evicting Pods. The Descheduler periodically checks the placement of Pods in the Kubernetes cluster and evicts them to less loaded nodes using a set of pre-configured strategies. For Descheduler to operate, a minimum of three nodes in the Kubernetes cluster is required.</p>
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<p class="p_CodeExample" style="page-break-inside: avoid;"><span class="f_CodeExample">начало внимание </span></p>
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<p class="p_Normal">For a Kubernetes clusters deployed on the Deckhouse platform, the installation of Descheduler is not required. In this case, use the built-in <a href="https://deckhouse.io/documentation/v1/modules/400-descheduler/" class="weblink">module</a>. </p>
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<p class="p_CodeExample" style="page-break-inside: avoid;"><span class="f_CodeExample">конец внимание </span></p>
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<p class="p_Normal">The installation consists of three steps:</p>
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<ol style="list-style-type:decimal">
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<li value="1" class="p_Normal"><a href="install-descheduler.html#download-helm-chart-and-config-file" class="topiclink">Download the Helm chart and the configuration file</a>. </li><li value="2" class="p_Normal"><a href="install-descheduler.html#fill-config-file" class="topiclink">Fill out the configuration file</a>. </li><li value="3" class="p_Normal"><a href="install-descheduler.html#install-chart-descheduler" class="topiclink">Install the Descheduler chart using helm in the Kubernetes cluster</a>.</li></ol>
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<h2 class="p_Heading2"><a id="download-helm-chart-and-config-file" class="hmanchor"></a><span class="f_Heading2">Step 1: Download the Helm chart and the configuration file</span></h2>
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<p class="p_Normal">To install via the internet, obtain the configuration file <code><b>values-descheduler.yaml</b></code> by executing the command:</p>
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<p class="p_CodeExample" style="page-break-inside: avoid;"><span class="f_CodeExample">helm repo add elma365 </span><span class="f_CodeExample">https://charts.elma365.tech</span><br />
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<span class="f_CodeExample">helm repo update</span><br />
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<span class="f_CodeExample">helm show values elma365/descheduler > values-descheduler.yaml</span></p>
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<p class="p_Normal"><a class="dropdown-toggle" style="font-style: normal; font-weight: normal; color: #000000; background-color: transparent; text-decoration: none;" href="javascript:HMToggle('toggle','TOGGLE0186A1')">Obtaining the configuration file for installation in a closed loop without internet access</a></p>
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<tr>
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<td style="vertical-align:top; padding:0; border:none"><ol style="list-style-type:decimal">
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<li value="1" class="p_Normal">On a computer with internet access, download the BRIX images and upload them to your local image registry by executing the following command:</li></ol>
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<p class="p_CodeExample" style="page-break-inside: avoid;"><span class="f_CodeExample">helm repo add elma365 </span><span class="f_CodeExample">https://charts.elma365.tech</span><br />
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<span class="f_CodeExample">helm repo update</span><br />
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<span class="f_CodeExample">helm pull elma365/descheduler</span></p>
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<p class="p_Normal">For more details, see <a href="downloadin-images-elma365.html" class="topiclink">Download BRIX images</a>.</p>
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<ol style="list-style-type:decimal" start="2">
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<li value="2" class="p_Normal">Copy the downloaded chart archive <code><b>descheduler-X.Y.Z.tgz</b></code> onto the server where the installation will take place.</li></ol>
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<ol style="list-style-type:decimal" start="3">
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<li value="3" class="p_Normal">Unpack this chart and copy the default configuration file <code><b>values.yaml</b></code> to <code><b>values-descheduler.yaml</b></code>: </li></ol>
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<p class="p_CodeExample" style="page-break-inside: avoid;"><span class="f_CodeExample">tar -xf descheduler-X.Y.Z.tgz</span><br />
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<span class="f_CodeExample">cp descheduler/values.yaml values-descheduler.yaml</span></p>
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</td>
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</tr>
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</table>
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</div>
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<h2 class="p_Heading2"><a id="fill-config-file" class="hmanchor"></a><span class="f_Heading2">Step 2: Fill out the configuration file</span></h2>
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<p class="p_Normal">Fill out the configuration file <code><b>values-descheduler.yaml</b></code> for the Descheduler installation.</p>
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<p class="p_Normal">For this purpose, configure the frequency of the Descheduler by setting the desired interval in minutes for the parameter <code><b>descheduler.deschedulingInterval</b></code>. The default interval is set to 2 minutes. The Descheduler is installed in <code><b>namespace kube-system</b></code>. This <code><b>namespace</b></code> is set by default.</p>
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<p class="p_CodeExample" style="white-space: normal; page-break-inside: avoid;"><span class="f_CodeExample"># Descheduler settings (at least 3 nodes in the cluster are required)</span><br />
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<span class="f_CodeExample">descheduler:</span><br />
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<span class="f_CodeExample"> # override service name</span><br />
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<span class="f_CodeExample"> fullnameOverride: descheduler</span><br />
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<span class="f_CodeExample"> # run as a CronJob or Deployment</span><br />
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<span class="f_CodeExample"> kind: Deployment</span><br />
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<span class="f_CodeExample"> # namespace for descheduler (must be created before installation with kubectl create ns kube-system)</span><br />
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<span class="f_CodeExample"> namespace: kube-system</span><br />
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<span class="f_CodeExample"> # sets the time between consecutive executions of descheduler</span><br />
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<span class="f_CodeExample"> deschedulingInterval: 2m</span><br />
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<span class="f_CodeExample"> # selectors to run on specific nodes</span><br />
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<span class="f_CodeExample"> nodeSelector: {}</span><br />
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<span class="f_CodeExample">...</span></p>
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<p class="p_Normal"><a class="dropdown-toggle" style="font-style: normal; font-weight: normal; color: #000000; background-color: transparent; text-decoration: none;" href="javascript:HMToggle('toggle','TOGGLE0186A2')">Filling in the connection parameters to the private registry for installation in a closed loop without internet access</a></p>
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<tr>
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<td style="vertical-align:top; padding:0; border:none"><p class="p_Normal"> <br />
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To connect to a private registry, you need to:</p>
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<ol style="list-style-type:decimal">
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<li value="1" class="p_Normal">Download the BRIX images and upload them to your local image registry. Read more about this <a href="downloadin-images-elma365.html" class="topiclink">Download BRIX images</a>.</li><li value="2" class="p_Normal">Set the address and path for the parameter <code><b>image.repository</b></code>.</li><li value="3" class="p_Normal">Indicate the name of the secret with access rights to the private registry in the parameter <code><b>imagePullSecrets</b></code>. The secret must be created manually and encrypted in Base64.</li></ol>
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<p class="p_CodeExample" style="white-space: normal; page-break-inside: avoid;"><span class="f_CodeExample"># Descheduler settings (at least 3 nodes in the cluster are required)</span><br />
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<span class="f_CodeExample">descheduler:</span><br />
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<span class="f_CodeExample">...</span><br />
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<span class="f_CodeExample"> # Connection parameters to the private registry</span><br />
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<span class="f_CodeExample"> image:</span><br />
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<span class="f_CodeExample"> # address and path for the private registry</span><br />
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<span class="f_CodeExample"> repository:</span><span class="f_CodeExample" style="color: #ffffff;"> </span><span class="f_CodeExample">registry.example.com/descheduler/descheduler</span><br />
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<span class="f_CodeExample"> # the secret with access rights to the private registry must be manually created, encrypted in Base64</span><br />
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<span class="f_CodeExample"> imagePullSecrets:</span><br />
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<span class="f_CodeExample"> -</span><span class="f_CodeExample" style="color: #ffffff;"> </span><span class="f_CodeExample">myRegistryKeySecretName</span></p>
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<p class="p_Normal">Where the repository<span style="font-weight: bold;"> </span>format is as follows:</p>
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<ul style="list-style-type:disc">
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<li class="p_Normal">Addres is <code><b>registry.example.com</b></code>.</li><li class="p_Normal">Path is <code><b>/descheduler/descheduler</b></code>. </li></ul>
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</td>
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</tr>
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</table>
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</div>
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<h2 class="p_Heading2"><a id="install-chart-descheduler" class="hmanchor"></a><span class="f_Heading2">Step 3: Install the Descheduler chart using helm in the Kubernetes cluster </span></h2>
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<p class="p_Normal">Install the Descheduler chart in <code><b>namespace kube-system</b></code>.</p>
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<p class="p_Normal">For online installation:</p>
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<p class="p_CodeExample" style="page-break-inside: avoid;"><span class="f_CodeExample">helm upgrade --install descheduler elma365/descheduler -f values-descheduler.yaml -n kube-system </span></p>
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<p class="p_Normal">For offline installation without internet access, navigate to the directory with the downloaded chart and execute the command:</p>
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<p class="p_CodeExample" style="page-break-inside: avoid;"><span class="f_CodeExample">helm upgrade --install descheduler ./descheduler -f values-descheduler.yaml -n kube-system</span></p>
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<h2 class="p_Heading2"><span class="f_Heading2">Delete the Descheduler chart using helm in the Kubernetes cluster</span></h2>
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<p class="p_Normal">To delete the Descheduler chart in <code><b>namespace kube-system</b></code>, execute the command:</p>
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<p class="p_CodeExample" style="page-break-inside: avoid;"><span class="f_CodeExample">helm uninstall descheduler -n kube-system </span></p>
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