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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 NodeLocal DNS Cache</p>
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<div class="topic__title"><h1 class="p_Heading1"><span class="f_Heading1">Install NodeLocal DNS Cache</span></h1>
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<!-- Placeholder for topic body. -->
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<p class="p_Normal">NodeLocal DNS Cache helps reduce the load on DNS queries within a Kubernetes cluster. NodeLocal DNS enhances the stability of DNS name resolution, which in turn can avoid DNAT rules, connection tracking, and connection count limits.</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 Kubernetes clusters deployed on the Deckhouse platform, the installation of NodeLocal DNS is not required. In this case, use the built-in <a href="https://deckhouse.io/documentation/v1/modules/350-node-local-dns/" 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 four 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-nodelocal-dns-cache.html#get-ip-addresses" class="topiclink">Get the IP address of the kube-dns service</a>.</li><li value="2" class="p_Normal"><a href="install-nodelocal-dns-cache.html#download-helm-chart-and-config-file" class="topiclink">Download the Helm chart and configuration file</a>.</li><li value="3" class="p_Normal"><a href="install-nodelocal-dns-cache.html#fill-config-file" class="topiclink">Fill out the configuration file</a>.</li><li value="4" class="p_Normal"><a href="install-nodelocal-dns-cache.html#install-nodelocaldns-chart" class="topiclink">Install the Node Local DNS chart using Helm in the Kubernetes cluster</a>.</li></ol>
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<h2 class="p_Heading2"><a id="get-ip-addresses" class="hmanchor"></a><span class="f_Heading2">Step 1: Get the IP address of the kube-dns service</span></h2>
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<p class="p_Normal">The kube-dns service is typically located in the <code><b>namespace kube-system</b></code> of the Kubernetes cluster.</p>
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<p class="p_Normal">Determine the IP address of the kube-dns service by executing the command:</p>
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<p class="p_CodeExample" style="page-break-inside: avoid;"><span class="f_CodeExample">kubectl get svc kube-dns -n kube-system -o jsonpath={.spec.clusterIP}</span></p>
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<p class="p_Normal">The result of the command should be the IP address, which will be used in Step 3. In the context of this article, the result of the command is the IP address 172.20.0.10.</p>
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<h2 class="p_Heading2"><a id="download-helm-chart-and-config-file" class="hmanchor"></a><span class="f_Heading2">Step 2: Download the Helm chart and configuration file</span></h2>
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<p class="p_Normal">For installation via the internet, obtain the configuration file <code><b>values-nodelocal-dns.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/node-local-dns > values-nodelocal-dns.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')">Getting the configuration file for installation in a closed-loop environment without internet access</a></p>
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<div id="TOGGLE0186A1" class="dropdown-toggle-body" style="text-align: left; text-indent: 0; line-height: 1.80; padding: 0 0 0 0; margin: 0 0 0 0;"><table style="border:none; border-spacing:0;">
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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 the 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/node-local-dns</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>node-local-dns-X.Y.Z.tgz</b></code> to the server where the installation will be performed.</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-nodelocal-dns.yaml</b></code>: </li></ol>
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<p class="p_CodeExample" style="page-break-inside: avoid;"><span class="f_CodeExample">tar -xf node-local-dns-X.Y.Z.tgz</span><br />
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<span class="f_CodeExample">cp node-local-dns/values.yaml values-nodelocal-dns.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 3: Fill out the configuration file</span></h2>
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<p class="p_Normal">Fill out the configuration file <code><b>values-nodelocal-dns.yaml</b></code> for the installation of NodeLocal DNS Cache.</p>
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<p class="p_CodeExample" style="page-break-inside: avoid;"><span class="f_CodeExample"># NodeLocal DNS Cache settings</span><br />
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<span class="f_CodeExample">node-local-dns:</span><br />
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<span class="f_CodeExample"> config:</span><br />
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<span class="f_CodeExample"> # cluster domain</span><br />
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<span class="f_CodeExample"> dnsDomain: "cluster.local"</span><br />
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<span class="f_CodeExample"> # IP address of kube-dns service</span><br />
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<span class="f_CodeExample"> dnsServer: "172.20.0.10"</span><br />
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<span class="f_CodeExample"> # IP address for NodeLocal DNS Cache.</span><br />
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<span class="f_CodeExample"> localDns: "169.254.20.25"</span></p>
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<p class="p_Normal">where:</p>
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<ul style="list-style-type:disc">
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<li class="p_Normal"><code><b>node-local-dns.config.dnsDomain</b></code> is the domain of the Kubernetes cluster;</li><li class="p_Normal"><code><b>node-local-dns.config.dnsServer</b></code> is the IP address of the kube-dns service, obtained in Step 1;</li><li class="p_Normal"><code><b>node-local-dns.config.localDns</b></code> is the local IP address for NodeLocal DNS Cache.</li></ul>
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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 out connection parameters to the private registry for installation in a closed-loop environment without internet access</a></p>
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<div id="TOGGLE0186A2" class="dropdown-toggle-body" style="text-align: left; text-indent: 0; line-height: 1.80; padding: 0 0 0 0; margin: 0 0 0 0;"><table style="border:none; border-spacing:0;">
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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 the 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 BRIX images and upload them to the local image registry. For more details, see <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>node-local-dns.image.repository</b></code>.</li></ol>
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<ol style="list-style-type:decimal" start="3">
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<li value="3" class="p_Normal">Indicate the name of the secret with access rights to the private registry in the parameter <code><b>node-local-dns.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"># NodeLocal DNS Cache settings</span><br />
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<span class="f_CodeExample">node-local-dns:</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: registry.example.com/dns/k8s-dns-node-cache</span><br />
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<span class="f_CodeExample"> # The secret with access rights to the private registry must be created manually, encrypted in Base64</span><br />
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<span class="f_CodeExample"> imagePullSecrets:</span><br />
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<span class="f_CodeExample"> - myRegistryKeySecretName</span></p>
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<p class="p_Normal">where <span style="font-weight: bold;">repository </span>format is:</p>
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<ul style="list-style-type:disc">
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<li class="p_Normal">address is <code><b>registry.example.com</b></code>; </li><li class="p_Normal">path is <code><b>/dns/k8s-dns-node-cache</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-nodelocaldns-chart" class="hmanchor"></a><span class="f_Heading2">Step 4: Install the Node Local DNS chart using Helm in the Kubernetes cluster</span></h2>
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<p class="p_Normal">Perform the installation of the Node Local DNS 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 nodelocaldns elma365/node-local-dns -f values-nodelocal-dns.yaml -n kube-system</span></p>
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<p class="p_Normal">For offline installation without internet access:</p>
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<p class="p_CodeExample" style="page-break-inside: avoid;"><span class="f_CodeExample">helm upgrade --install nodelocaldns ./node-local-dns -f values-nodelocal-dns.yaml -n kube-system</span></p>
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<h2 class="p_Heading2"><span class="f_Heading2">Delete Node Local DNS chart using helm in the Kubernetes cluster</span></h2>
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<p class="p_Normal">To remove the Node Local DNS 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 nodelocaldns -n kube-system</span></p>
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