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<p><a href="elma365-on-premises.html">BRIX On-Premises</a> &gt; <a href="elma365-enterprise.html">BRIX On-Premises Enterprise</a> &gt; Install add-on components for BRIX / Install Longhorn</p>
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<div class="topic__title"><h1 class="p_Heading1"><span class="f_Heading1">Install Longhorn</span></h1>
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<p style="line-height: 1.20; margin: 16px 0 16px 0;"><span style="color: #394149;">Longhorn is an easy-to-use distributed block storage system, providing highly available persistent storage for Kubernetes. It incorporates built-in features such as incremental snapshots, backup, and backup storage in a secondary storage compatible with NFS or S3, ensuring data security within the Kubernetes cluster.</span></p>
<h2 class="p_Heading2"><span class="f_Heading2">Installation requirements</span></h2>
<p style="line-height: 1.20; background: #ffffff; margin: 0 0 16px 0;"><span style="color: #394149;">Each node in the Kubernetes cluster where Longhorn is installed must meet the following requirements:</span></p>
<ul style="list-style-type:disc">
<li style="line-height: 1.20; background: #ffffff; margin-top: 0; margin-right: 0; margin-bottom: 0;"><span style="color: #394149;">Kubernetes: v1.21 or later, Docker: v1.13 or later, Containerd: v1.3.7 or later.</span></li><li style="line-height: 1.20; background: #ffffff; margin-top: 0; margin-right: 0; margin-bottom: 0;"><span style="color: #394149;">The open-iscsi package is installed, and the iscsid service is running.</span></li><li style="line-height: 1.20; background: #ffffff; margin-top: 0; margin-right: 0; margin-bottom: 0;"><span style="color: #394149;">The NFSv4 client is installed, necessary for backup and ReadWriteMany (RWX) functionality.</span></li><li style="line-height: 1.20; background: #ffffff; margin-top: 0; margin-right: 0; margin-bottom: 0;"><span style="color: #394149;">Filesystem: ext4 or XFS.</span></li><li style="line-height: 1.20; background: #ffffff; margin-top: 0; margin-right: 0; margin-bottom: 0;"><span style="color: #394149;">Packages: bash, curl, findmnt, grep, awk, blkid, lsblk are installed.</span></li><li style="line-height: 1.20; background: #ffffff; margin-top: 0; margin-right: 0; margin-bottom: 0;"><span style="color: #394149;">Mount propagation is enabled in the cluster.</span></li></ul>
<p style="line-height: 1.20; margin: 11px 0 15px 0;"><span style="color: #394149;">Installation consists of three steps:</span></p>
<ol style="list-style-type:decimal">
<li value="1" style="line-height: 1.20; margin-top: 11px; margin-right: 0; margin-bottom: 15px;"><span style="background-color: #ffffff;"><a href="install-longhorn.html#download-helm-chart-and-config-file" class="topiclink">Download the Helm chart and configuration file</a></span></li><li value="2" style="line-height: 1.20; margin-top: 11px; margin-right: 0; margin-bottom: 15px;"><span style="background-color: #ffffff;"><a href="install-longhorn.html#fill-config-file" class="topiclink">Fill in the configuration file</a></span></li><li value="3" style="line-height: 1.20; margin-top: 11px; margin-right: 0; margin-bottom: 15px;"><span style="background-color: #ffffff;"><a href="install-longhorn.html#install-longhorn-chart" class="topiclink">Install the Longhorn chart using Helm in the Kubernetes cluster</a></span></li></ol>
<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 configuration file</span></h2>
<p style="line-height: 1.20; margin: 11px 0 15px 0;"><span style="color: #394149;">For online installation, obtain the configuration file </span><span style="font-weight: bold; color: #394149;">values-longhorn.yaml</span><span style="color: #394149;"> by executing the command:</span></p>
<p class="p_CodeExample" style="page-break-inside: avoid;"><span class="f_CodeExample">helm&nbsp;repo&nbsp;add&nbsp;elma365&nbsp;https://charts.elma365.tech</span><br />
<span class="f_CodeExample">helm&nbsp;repo&nbsp;update</span><br />
<span class="f_CodeExample">helm&nbsp;show&nbsp;values&nbsp;elma365/longhorn&nbsp;&gt;&nbsp;values-longhorn.yaml</span></p>
<h2 class="p_Heading2"><a id="fill-config-file" class="hmanchor"></a><span class="f_Heading2">Step 2: Fill in the configuration file</span></h2>
<p style="line-height: 1.20; margin: 11px 0 15px 0;"><span style="color: #394149;">Fill in the </span><span style="font-weight: bold; color: #394149;">values-longhorn.yaml</span><span style="color: #394149;"> configuration file to install the Longhorn service..</span></p>
<p class="p_CodeExample" style="page-break-inside: avoid;"><span class="f_CodeExample">#&nbsp;Longhorn&nbsp;settings</span><br />
<span class="f_CodeExample">longhorn:</span><br />
<span class="f_CodeExample"> &nbsp;defaultSettings:</span><br />
<span class="f_CodeExample">#&nbsp;Directory&nbsp;for&nbsp;storing&nbsp;data&nbsp;on&nbsp;the&nbsp;host</span><br />
<span class="f_CodeExample"> &nbsp;&nbsp;&nbsp;defaultDataPath:&nbsp;/longhorn</span><br />
<span class="f_CodeExample">#&nbsp;Schedule&nbsp;replicas&nbsp;on&nbsp;nodes&nbsp;with&nbsp;existing&nbsp;healthy&nbsp;replicas&nbsp;of&nbsp;the&nbsp;same&nbsp;volume</span><br />
<span class="f_CodeExample"> &nbsp;&nbsp;&nbsp;replicaSoftAntiAffinity:&nbsp;true</span><br />
<span class="f_CodeExample">#&nbsp;&nbsp;Automatically&nbsp;balance&nbsp;replicas&nbsp;upon&nbsp;detecting&nbsp;an&nbsp;available&nbsp;node</span><br />
<span class="f_CodeExample"> &nbsp;&nbsp;&nbsp;replicaAutoBalance:&nbsp;best-effort</span><br />
<span class="f_CodeExample"> &nbsp;ingress:</span><br />
<span class="f_CodeExample">#&nbsp;Enable&nbsp;Ingress&nbsp;for&nbsp;the&nbsp;Longhorn&nbsp;UI</span><br />
<span class="f_CodeExample"> &nbsp;&nbsp;&nbsp;enabled:&nbsp;false</span><br />
<span class="f_CodeExample"> &nbsp;&nbsp;&nbsp;ingressClassName:&nbsp;~</span><br />
<span class="f_CodeExample">#&nbsp;Domain&nbsp;(FQDN)&nbsp;through&nbsp;which&nbsp;the&nbsp;Longhorn&nbsp;UI&nbsp;will&nbsp;be&nbsp;accessible</span><br />
<span class="f_CodeExample"> &nbsp;&nbsp;&nbsp;host:&nbsp;example.ru</span><br />
<span class="f_CodeExample">#&nbsp;Enable&nbsp;encryption</span><br />
<span class="f_CodeExample"> &nbsp;&nbsp;&nbsp;tls:&nbsp;false</span><br />
<span class="f_CodeExample"> &nbsp;&nbsp;&nbsp;tlsSecret:&nbsp;elma365-onpremise-tls</span><br />
<span class="f_CodeExample"> &nbsp;csi:</span><br />
<span class="f_CodeExample">#&nbsp;:&nbsp;kubelet&nbsp;root&nbsp;directory</span><br />
<span class="f_CodeExample"> &nbsp;&nbsp;&nbsp;kubeletRootDir:&nbsp;/var/lib/kubelet</span></p>
<h2 class="p_Heading2"><a id="install-longhorn-chart" class="hmanchor"></a><span class="f_Heading2">Step 3: Install the Longhorn chart using Helm in the Kubernetes cluster </span></h2>
<p style="line-height: 1.20; margin: 11px 0 15px 0;"><span style="color: #394149;">Perform the installation of the Longhorn chart online in </span><code><b>namespace longhorn-system</b></code><span style="color: #394149;">. The </span><code><b>namespace</b></code><span style="font-size: 13px;"> </span><span style="color: #394149;"> will be created during installation if not created earlier.</span></p>
<p class="p_CodeExample" style="page-break-inside: avoid;"><span class="f_CodeExample">helm&nbsp;upgrade&nbsp;--install&nbsp;longhorn&nbsp;elma365/longhorn&nbsp;-f&nbsp;values-longhorn.yaml&nbsp;-n&nbsp;longhorn-system&nbsp;--create-namespace</span></p>
<h2 class="p_Heading2"><span class="f_Heading2">Delete the Longhorn chart using helm in the Kubernetes cluster</span></h2>
<p style="line-height: 1.20; background: #ffffff; margin: 0 0 15px 0;"><span style="color: #394149;">To enable the removal of Longhorn, set the value </span><code><b>true</b></code><span style="color: #394149;"> for the </span><code><b>deleting-confirmation-flag</b></code><span style="color: #394149;"> flag by executing the command Longhorn:</span></p>
<p class="p_CodeExample" style="page-break-inside: avoid;"><span class="f_CodeExample">kubectl&nbsp;-n&nbsp;longhorn-system&nbsp;patch&nbsp;-p&nbsp;'{&quot;value&quot;:&nbsp;&quot;true&quot;}'&nbsp;--type=merge&nbsp;lhs&nbsp;deleting-confirmation-flag</span></p>
<p style="line-height: 1.20; background: #ffffff; margin: 11px 0 15px 0;"><span style="color: #394149;">To uninstall the Longhorn chart in </span><span style="font-weight: bold; color: #394149;">namespace longhorn-system</span><span style="color: #394149;">, execute the command:</span></p>
<p class="p_CodeExample" style="page-break-inside: avoid;"><span class="f_CodeExample">helm&nbsp;uninstall&nbsp;longhorn&nbsp;-n&nbsp;longhorn-system</span></p>
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