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<title>Install NodeLocal DNS Cache</title>
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<div class="topic__title"><h1 class="p_Heading1"><span class="f_Heading1">Установка NodeLocal DNS Cache</span></h1>
<div class="topic__title"><h1 class="p_Heading1"><span class="f_Heading1">Install NodeLocal DNS Cache</span></h1>
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<p class="p_Normal">NodeLocal DNS Cache позволяет снизить нагрузку по DNS-запросам в кластере Kubernetes. NodeLocal DNS позволяет повысить стабильность преобразования DNS-имён, что в свою очередь позволит избежать правил DNAT, connection tracking и ограничений по количеству соединений.</p>
<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>
<p class="p_CodeExample" style="page-break-inside: avoid;"><span class="f_CodeExample">начало&nbsp;внимание&nbsp;</span></p>
<p class="p_Normal">Для Kubernetes-кластеров, развёрнутых на платформе Deckhouse, не требуется установка NodeLocal DNS. В этом случае используйте встроенный <a href="https://deckhouse.ru/documentation/v1/modules/350-node-local-dns/" class="weblink">модуль</a>. </p>
<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>
<p class="p_CodeExample" style="page-break-inside: avoid;"><span class="f_CodeExample">конец&nbsp;внимание&nbsp;</span></p>
<p class="p_Normal">Установка состоит из четырёх этапов:</p>
<p class="p_Normal">The installation consists of four steps:</p>
<ol style="list-style-type:decimal">
<li value="1" class="p_Normal"><a href="install-nodelocal-dns-cache.html#get-ip-addresses" class="topiclink">Получение IP-адреса сервиса kube-dns</a>.</li><li value="2" class="p_Normal"><a href="install-nodelocal-dns-cache.html#download-helm-chart-and-config-file" class="topiclink">Загрузка Helm-чарта и конфигурационного файла</a>.</li><li value="3" class="p_Normal"><a href="install-nodelocal-dns-cache.html#fill-config-file" class="topiclink">Заполнение конфигурационного файла</a>.</li><li value="4" class="p_Normal"><a href="install-nodelocal-dns-cache.html#install-nodelocaldns-chart" class="topiclink">Установка чарта Node Local DNS с помощью Helm в Kubernetes-кластер</a>.</li></ol>
<h2 class="p_Heading2"><a id="get-ip-addresses" class="hmanchor"></a><span class="f_Heading2">Шаг 1. Получение IP-адреса сервиса kube-dns</span></h2>
<p class="p_Normal">Сервис kube-dns как правило расположен в <code><b>namespace kube-system</b></code> кластера Kubernetes.</p>
<p class="p_Normal">Определите IP-адрес сервиса kube-dns, выполнив команду:</p>
<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>
<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>
<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>
<p class="p_Normal">Determine the IP address of the kube-dns service by executing the command:</p>
<p class="p_CodeExample" style="page-break-inside: avoid;"><span class="f_CodeExample">kubectl&nbsp;get&nbsp;svc&nbsp;kube-dns&nbsp;-n&nbsp;kube-system&nbsp;-o&nbsp;jsonpath={.spec.clusterIP}</span></p>
<p class="p_Normal">Результатом выполнения команды должен быть IP-адрес, который будет использован на шаге 3. В рамках статьи результатом выполнения команды стал IP-адрес 172.20.0.10.</p>
<p class="p_Normal">Получите IP-адрес сервиса kube-dns в Deckhouse, выполнив команду:</p>
<p class="p_CodeExample" style="page-break-inside: avoid;"><span class="f_CodeExample">kubectl&nbsp;get&nbsp;svc&nbsp;d8-kube-dns&nbsp;-n&nbsp;kube-system&nbsp;-o&nbsp;jsonpath={.spec.clusterIP}</span></p>
<h2 class="p_Heading2"><a id="download-helm-chart-and-config-file" class="hmanchor"></a><span class="f_Heading2">Шаг 2. Загрузка Helm-чарта и конфигурационного файла</span></h2>
<p class="p_Normal">Для установки через интернет получите конфигурационный файл <code><b>values-nodelocal-dns.yaml</b></code>, выполнив команду:</p>
<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>
<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>
<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>
<p class="p_CodeExample" style="page-break-inside: avoid;"><span class="f_CodeExample">helm&nbsp;repo&nbsp;add&nbsp;elma365&nbsp;</span><span class="f_CodeExample">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/node-local-dns&nbsp;&gt;&nbsp;values-nodelocal-dns.yaml</span></p>
<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')">Получение конфигурационного файла для установки в закрытом контуре без доступа в интернет</a></p>
<div id="TOGGLE0186A1" class="dropdown-toggle-body" style="text-align: left; text-indent: 0; padding: 0 0 0 0; margin: 0 0 0 0;"><table style="border:none; border-spacing:0;">
<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>
<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;">
<tr>
<td style="vertical-align:top; padding:0; border:none"><ol style="list-style-type:decimal">
<li value="1" class="p_Normal">На компьютере с доступом в интернет скачайте образы ELMA365 и загрузите их в локальный реестр образов, выполнив следующую команду:</li></ol>
<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>
<p class="p_CodeExample" style="page-break-inside: avoid;"><span class="f_CodeExample">helm&nbsp;repo&nbsp;add&nbsp;elma365</span><span class="f_CodeExample">&nbsp;https://charts.elma365.tech</span><br />
<span class="f_CodeExample">helm&nbsp;repo&nbsp;update</span><br />
<span class="f_CodeExample">helm&nbsp;pull&nbsp;elma365/node-local-dns</span></p>
<p class="p_Normal">Подробнее об этом читайте в статье <a href="downloadin-images-elma365.html" class="topiclink">«Загрузка образов ELMA365»</a>.</p>
<p class="p_Normal">For more details, see <a href="downloadin-images-elma365.html" class="topiclink">Download BRIX images</a>.</p>
<ol style="list-style-type:decimal" start="2">
<li value="2" class="p_Normal">Полученный архив чарта <code><b>node-local-dns-X.Y.Z.tgz</b></code> скопируйте на сервер, где будет производиться установка.</li></ol>
<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>
<ol style="list-style-type:decimal" start="3">
<li value="3" class="p_Normal">Распакуйте этот чарт и скопируйте конфигурационный файл по умолчанию <code><b>values.yaml</b></code> в <code><b>values-nodelocal-dns.yaml</b></code>: </li></ol>
<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>
<p class="p_CodeExample" style="page-break-inside: avoid;"><span class="f_CodeExample">tar&nbsp;-xf&nbsp;node-local-dns-X.Y.Z.tgz</span><br />
<span class="f_CodeExample">cp&nbsp;node-local-dns/values.yaml&nbsp;values-nodelocal-dns.yaml</span></p>
</td>
</tr>
</table>
</div>
<h2 class="p_Heading2"><a id="fill-config-file" class="hmanchor"></a><span class="f_Heading2">Шаг 3. Заполнение конфигурационного файла</span></h2>
<p class="p_Normal">Заполните конфигурационный файл <code><b>values-nodelocal-dns.yaml</b></code> для установки NodeLocal DNS Cache.</p>
<p class="p_CodeExample" style="page-break-inside: avoid;"><span class="f_CodeExample">#&nbsp;Настройки&nbsp;NodeLocal&nbsp;DNS&nbsp;Cache</span><br />
<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>
<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>
<p class="p_CodeExample" style="page-break-inside: avoid;"><span class="f_CodeExample">#&nbsp;NodeLocal&nbsp;DNS&nbsp;Cache&nbsp;settings</span><br />
<span class="f_CodeExample">node-local-dns:</span><br />
<span class="f_CodeExample">&nbsp;&nbsp;config:</span><br />
<span class="f_CodeExample">&nbsp;&nbsp;&nbsp;&nbsp;#&nbsp;домен&nbsp;кластера</span><br />
<span class="f_CodeExample">&nbsp;&nbsp;&nbsp;&nbsp;#&nbsp;cluster&nbsp;domain</span><br />
<span class="f_CodeExample">&nbsp;&nbsp;&nbsp;&nbsp;dnsDomain:&nbsp;&quot;cluster.local&quot;</span><br />
<span class="f_CodeExample">&nbsp;&nbsp;&nbsp;&nbsp;#&nbsp;IP-адрес&nbsp;сервиса&nbsp;kube-dns</span><br />
<span class="f_CodeExample">&nbsp;&nbsp;&nbsp;&nbsp;#&nbsp;IP&nbsp;address&nbsp;of&nbsp;kube-dns&nbsp;service</span><br />
<span class="f_CodeExample">&nbsp;&nbsp;&nbsp;&nbsp;dnsServer:&nbsp;&quot;172.20.0.10&quot;</span><br />
<span class="f_CodeExample">&nbsp;&nbsp;&nbsp;&nbsp;#&nbsp;IP-адрес&nbsp;для&nbsp;NodeLocal&nbsp;DNS&nbsp;Cache.</span><br />
<span class="f_CodeExample">&nbsp;&nbsp;&nbsp;&nbsp;#&nbsp;IP&nbsp;address&nbsp;for&nbsp;NodeLocal&nbsp;DNS&nbsp;Cache.</span><br />
<span class="f_CodeExample">&nbsp;&nbsp;&nbsp;&nbsp;localDns:&nbsp;&quot;169.254.20.25&quot;</span></p>
<p class="p_Normal">где:</p>
<p class="p_Normal">where:</p>
<ul style="list-style-type:disc">
<li class="p_Normal"><code><b>node-local-dns.config.dnsDomain</b></code> — домен кластера Kubernetes;</li><li class="p_Normal"><code><b>node-local-dns.config.dnsServer</b></code> — IP-адрес сервиса kube-dns, полученный на шаге 1;</li><li class="p_Normal"><code><b>node-local-dns.config.localDns</b></code> — локальный IP-адрес для NodeLocal DNS Cache.</li></ul>
<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')">Заполнение параметров подключения к приватному registry для установки в закрытом контуре без доступа в интернет</a></p>
<div id="TOGGLE0186A2" class="dropdown-toggle-body" style="text-align: left; text-indent: 0; padding: 0 0 0 0; margin: 0 0 0 0;"><table style="border:none; border-spacing:0;">
<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>
<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>
<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;">
<tr>
<td style="vertical-align:top; padding:0; border:none"><p class="p_Normal">&nbsp;<br />
Для подключения к приватному <span style="font-weight: bold;">registry</span> нужно:</p>
To connect to the private registry, you need to:</p>
<ol style="list-style-type:decimal">
<li value="1" class="p_Normal">Скачать образы ELMA365 и загрузить их в локальный реестр образов. Подробнее об этом читайте в статье <a href="downloadin-images-elma365.html" class="topiclink">«Загрузка образов ELMA365»</a>.</li><li value="2" class="p_Normal">Задать адрес и путь для параметра <code><b>node-local-dns.image.repository</b></code>.</li></ol>
<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>
<ol style="list-style-type:decimal" start="3">
<li value="3" class="p_Normal">Указать наименование секрета с правами доступа к приватному <span style="font-weight: bold;">registry</span> в параметре <code><b>node-local-dns.imagePullSecrets</b></code>. Секрет должен быть создан вручную и зашифрован в Base64.</li></ol>
<p class="p_CodeExample" style="white-space: normal; page-break-inside: avoid;"><span class="f_CodeExample"># Настройки NodeLocal DNS Cache</span><br />
<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>
<p class="p_CodeExample" style="white-space: normal; page-break-inside: avoid;"><span class="f_CodeExample"># NodeLocal DNS Cache settings</span><br />
<span class="f_CodeExample">node-local-dns:</span><br />
<span class="f_CodeExample">  # Параметры подключения к приватному registry</span><br />
<span class="f_CodeExample">  # Connection parameters to the private registry</span><br />
<span class="f_CodeExample">  image:</span><br />
<span class="f_CodeExample">  &nbsp; # адрес и путь для приватного registry</span><br />
<span class="f_CodeExample">  &nbsp; # address and path for the private registry</span><br />
<span class="f_CodeExample">  &nbsp; repository: registry.example.com/dns/k8s-dns-node-cache</span><br />
<span class="f_CodeExample">  # секрет с правами доступа к приватному registry должен быть создан вручную, зашифрованный в Base64</span><br />
<span class="f_CodeExample">  # The secret with access rights to the private registry must be created manually, encrypted in Base64</span><br />
<span class="f_CodeExample">  imagePullSecrets:</span><br />
<span class="f_CodeExample">  &nbsp; - myRegistryKeySecretName</span></p>
<p class="p_Normal">где формат <span style="font-weight: bold;">repository</span>:</p>
<p class="p_Normal">where <span style="font-weight: bold;">repository </span>format is:</p>
<ul style="list-style-type:disc">
<li class="p_Normal">адрес — <code><b>registry.example.com</b></code>; </li><li class="p_Normal">путь — <code><b>/dns/k8s-dns-node-cache</b></code>. </li></ul>
<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>
</td>
</tr>
</table>
</div>
<h2 class="p_Heading2"><a id="install-nodelocaldns-chart" class="hmanchor"></a><span class="f_Heading2">Шаг 4. Установка чарта Node Local DNS с помощью Helm в Kubernetes-кластер</span></h2>
<p class="p_Normal">Выполните установку чарта Node Local DNS в <code><b>namespace kube-system</b></code>.</p>
<p class="p_Normal">Для установки через интернет:</p>
<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>
<p class="p_Normal">Perform the installation of the Node Local DNS chart in <code><b>namespace kube-system</b></code>.</p>
<p class="p_Normal">For online installation:</p>
<p class="p_CodeExample" style="page-break-inside: avoid;"><span class="f_CodeExample">helm&nbsp;upgrade&nbsp;--install&nbsp;nodelocaldns&nbsp;elma365/node-local-dns&nbsp;-f&nbsp;values-nodelocal-dns.yaml&nbsp;-n&nbsp;kube-system</span></p>
<p class="p_Normal">Для установки без доступа в интернет:</p>
<p class="p_Normal">For offline installation without internet access:</p>
<p class="p_CodeExample" style="page-break-inside: avoid;"><span class="f_CodeExample">helm&nbsp;upgrade&nbsp;--install&nbsp;nodelocaldns&nbsp;./node-local-dns&nbsp;-f&nbsp;values-nodelocal-dns.yaml&nbsp;-n&nbsp;kube-system</span></p>
<h2 class="p_Heading2"><span class="f_Heading2">Удалить чарт Node Local DNS с помощью Helm в Kubernetes-кластере</span></h2>
<p class="p_Normal">Чтобы удалить чарт Node Local DNS в <code><b>namespace kube-system</b></code>, выполните команду:</p>
<h2 class="p_Heading2"><span class="f_Heading2">Delete Node Local DNS chart using helm in the Kubernetes cluster</span></h2>
<p class="p_Normal">To remove the Node Local DNS chart in <code><b>namespace kube-system</b></code>, execute the command:</p>
<p class="p_CodeExample" style="page-break-inside: avoid;"><span class="f_CodeExample">helm&nbsp;uninstall&nbsp;nodelocaldns&nbsp;-n&nbsp;kube-system</span></p>
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