content/posts/2021-12-26Enable_NFS_on_K3S.html


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<section>
    <p>
        By default <a href="https://k3s.io/">K3S</a> comes only
        with <a href="https://github.com/rancher/local-path-provisioner">local-path</a>
        storage class, and if you are running with more than one node in your
        cluster you may want to use a more &ldquo;distributed&rdquo; solution.
        For may case I opted for NFS.
    </p>
    <p>
        To check the current storage class you can run:
    </p>
    <pre><code>k3s kubectl get storageclasses</code></pre>
    <p>
        And it will print something like:
    </p>
    <pre><code>NAME                   PROVISIONER                                     RECLAIMPOLICY   VOLUMEBINDINGMODE      ALLOWVOLUMEEXPANSION   AGE
local-path (default)   rancher.io/local-path                           Delete          WaitForFirstConsumer   false                  154d</code></pre>
    <p>
        To start adding First you need to
        install <a href="https://github.com/helm/helm">helm</a> on your server.
        To do so you may run:
    </p>

    <pre><code>curl -sSL https://raw.githubusercontent.com/helm/helm/master/scripts/get-helm-3 | bash</code></pre>
    <p>
        Be careful when running scripts directly into bash always check the
        source Sometimes is also recommended to do not pipe directly to bash
    </p>
    <p>
        Once it is installed we need to add
        the <a href="https://kubernetes.io/docs/concepts/storage/storage-classes/#nfs">NFS
        storage classes</a>. It has two providers, I have
        chose <a href="https://github.com/kubernetes-sigs/nfs-subdir-external-provisioner">NFS
        Subdir External Provisioner</a>.
    </p>
    <p>
        Add the helm repo
    </p>

    <pre><code>helm repo add nfs-subdir-external-provisioner https://kubernetes-sigs.github.io/nfs-subdir-external-provisioner/</code></pre>
    <p>
        Then we need to actually install the provider
    </p>
    <div class="org-src-container">
<pre><code>helm install nfs-subdir-external-provisioner nfs-subdir-external-provisioner/nfs-subdir-external-provisioner
--set nfs.server=x.x.x.x
--set nfs.path=/exported/path</code></pre>
    </div>
    <p>
        Set the <code>nfs.server</code> and <code>nfs.path</code> accordingly
        with your setup.
    </p>
    <p>
        After that if we run <code>k3s kubectl get storageclasses</code> it will
        now print another NFS provider:
    </p>

    <pre><code>NAME                   PROVISIONER                                     RECLAIMPOLICY   VOLUMEBINDINGMODE      ALLOWVOLUMEEXPANSION   AGE
local-path (default)   rancher.io/local-path                           Delete          WaitForFirstConsumer   false                  154d
nfs-client             cluster.local/nfs-subdir-external-provisioner   Delete          Immediate              true                   76m</code></pre>
</section>