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  <h1>1.2. Install MicroK8s</h1>

<p>This section describes how to deploy the MicroK8s Kubernetes platform and configure it 
to be used with ETSI TeraFlowSDN controller.
Besides, Docker is installed to build docker images for the ETSI TeraFlowSDN controller.</p>
<p>The steps described in this section might take some minutes depending on your internet 
connection speed and the resources assigned to your VM, or the specifications of your 
physical server.</p>
<p>To facilitate work, these steps are easier to be executed through an SSH connection, for instance using tools like <a href="https://www.putty.org/">PuTTY</a> or <a href="https://mobaxterm.mobatek.net/">MobaXterm</a>.</p>
<h2 id="upgrade-the-ubuntu-distribution">Upgrade the Ubuntu distribution</h2>
<p>Skip this step if you already did it during the creation of the VM.</p>
<pre><code class="language-bash">sudo apt-get update -y
sudo apt-get dist-upgrade -y
</code></pre>
<h2 id="install-prerequisites">Install prerequisites</h2>
<pre><code class="language-bash">sudo apt-get install -y ca-certificates curl gnupg lsb-release snapd jq
</code></pre>
<h2 id="install-docker-ce">Install Docker CE</h2>
<p>Install Docker CE and Docker BuildX plugin</p>
<pre><code class="language-bash">sudo apt-get install -y docker.io docker-buildx
</code></pre>
<p><strong>NOTE</strong>: Starting from Docker v23, <a href="https://docs.docker.com/build/architecture/">Build architecture</a> has been updated and <code>docker build</code> command entered into deprecation process in favor of the new <code>docker buildx build</code> command. Package <code>docker-buildx</code> provides the new <code>docker buildx build</code> command.</p>
<p>Add key "insecure-registries" with the private repository to the daemon configuration. It is done in two commands since
sometimes read from and write to same file might cause trouble.</p>
<pre><code class="language-bash">if [ -s /etc/docker/daemon.json ]; then cat /etc/docker/daemon.json; else echo '{}'; fi \
    | jq 'if has(&quot;insecure-registries&quot;) then . else .+ {&quot;insecure-registries&quot;: []} end' -- \
    | jq '.&quot;insecure-registries&quot; |= (.+ [&quot;localhost:32000&quot;] | unique)' -- \
    | tee tmp.daemon.json
sudo mv tmp.daemon.json /etc/docker/daemon.json
sudo chown root:root /etc/docker/daemon.json
sudo chmod 600 /etc/docker/daemon.json
</code></pre>
<p>Restart the Docker daemon</p>
<pre><code class="language-bash">sudo systemctl restart docker
</code></pre>
<h2 id="install-microk8s">Install MicroK8s</h2>
<p><strong>Important</strong>: Some TeraFlowSDN dependencies need to be executed on top of MicroK8s/Kubernetes v1.24. It is not guaranteed (by now) to run on newer versions.</p>
<pre><code class="language-bash"># Install MicroK8s
sudo snap install microk8s --classic --channel=1.24/stable

# Create alias for command &quot;microk8s.kubectl&quot; to be usable as &quot;kubectl&quot;
sudo snap alias microk8s.kubectl kubectl
</code></pre>
<p>It is important to make sure that <code>ufw</code> will not interfere with the internal pod-to-pod
and pod-to-Internet traffic.
To do so, first check the status.
If <code>ufw</code> is active, use the following command to enable the communication.</p>
<pre><code class="language-bash">
# Verify status of ufw firewall
sudo ufw status

# If ufw is active, install following rules to enable access pod-to-pod and pod-to-internet
sudo ufw allow in on cni0 &amp;&amp; sudo ufw allow out on cni0
sudo ufw default allow routed
</code></pre>
<p><strong>NOTE</strong>: MicroK8s can be used to compose a Highly Available Kubernetes cluster enabling you to construct an environment combining the CPU, RAM and storage resources of multiple machines. If you are interested in this procedure, review the official instructions in <a href="https://ubuntu.com/tutorials/getting-started-with-kubernetes-ha">How to build a highly available Kubernetes cluster with MicroK8s</a>, in particular, the step <a href="https://ubuntu.com/tutorials/getting-started-with-kubernetes-ha#4-create-a-microk8s-multinode-cluster">Create a MicroK8s multi-node cluster</a>.</p>
<h4 id="references">References:</h4>
<ul>
<li><a href="https://microk8s.io/#install-microk8s">The lightweight Kubernetes &gt; Install MicroK8s</a></li>
<li><a href="https://ubuntu.com/tutorials/install-a-local-kubernetes-with-microk8s">Install a local Kubernetes with MicroK8s</a></li>
<li><a href="https://ubuntu.com/tutorials/getting-started-with-kubernetes-ha">How to build a highly available Kubernetes cluster with MicroK8s</a></li>
</ul>
<h2 id="add-user-to-the-docker-and-microk8s-groups">Add user to the docker and microk8s groups</h2>
<p>It is important that your user has the permission to run <code>docker</code> and <code>microk8s</code> in the 
terminal.
To allow this, you need to add your user to the <code>docker</code> and <code>microk8s</code> groups with the 
following commands:</p>
<pre><code class="language-bash">sudo usermod -a -G docker $USER
sudo usermod -a -G microk8s $USER
sudo chown -f -R $USER $HOME/.kube
sudo reboot
</code></pre>
<p>In case that you get trouble executing the following commands, might due to the .kube folder is not automatically provisioned into your home folder, you may follow the steps below:</p>
<pre><code class="language-bash">mkdir -p $HOME/.kube
sudo chown -f -R $USER $HOME/.kube
microk8s config &gt; $HOME/.kube/config
sudo reboot
</code></pre>
<h2 id="check-status-of-kubernetes-and-addons">Check status of Kubernetes and addons</h2>
<p>To retrieve the status of Kubernetes <strong>once</strong>, run the following command:</p>