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Little helper to run CNCF's k3s in Docker
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${ item.name }
Create tag ${ searchTerm }
Create branch ${ searchTerm }
from '78fbcae938'
${ noResults }
k3d/v5.3.0/usage/advanced/calico/index.html

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K3s Features in k3d
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Use Calico instead of Flannel
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Use Calico instead of Flannel
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K3d kubeconfig get
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K3d kubeconfig merge
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K3d node
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K3d node create
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1. Download and modify the Calico descriptor
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<h1 id="use-calico-instead-of-flannel">Use Calico instead of Flannel<a class="headerlink" href="#use-calico-instead-of-flannel" title="Permanent link">&para;</a></h1>
<p>If you want to use NetworkPolicy you can use Calico in k3s instead of Flannel.</p>
<h2 id="1-download-and-modify-the-calico-descriptor">1. Download and modify the Calico descriptor<a class="headerlink" href="#1-download-and-modify-the-calico-descriptor" title="Permanent link">&para;</a></h2>
<p>You can following the <a href="https://docs.projectcalico.org/master/reference/cni-plugin/configuration">documentation</a></p>
<p>And then you have to change the ConfigMap <code>calico-config</code>. On the <code>cni_network_config</code> add the entry for allowing IP forwarding </p>
<div class="highlight"><pre><span></span><code><span class="nt">&quot;container_settings&quot;</span><span class="p">:</span> <span class="p">{</span>
<span class="nt">&quot;allow_ip_forwarding&quot;</span><span class="p">:</span> <span class="kc">true</span>
<span class="p">}</span>
</code></pre></div>
<p>Or you can directly use this <a href="../calico.yaml">calico.yaml</a> manifest</p>
<h2 id="2-create-the-cluster-without-flannel-and-with-calico">2. Create the cluster without flannel and with calico<a class="headerlink" href="#2-create-the-cluster-without-flannel-and-with-calico" title="Permanent link">&para;</a></h2>
<p>On the k3s cluster creation :</p>
<ul>
<li>add the flag <code>--flannel-backend=none</code>. For this, on k3d you need to forward this flag to k3s with the option <code>--k3s-arg</code>.</li>
<li>mount (<code>--volume</code>) the calico descriptor in the auto deploy manifest directory of k3s <code>/var/lib/rancher/k3s/server/manifests/</code></li>
</ul>
<p>So the command of the cluster creation is (when you are at root of the k3d repository)</p>
<div class="highlight"><pre><span></span><code>k3d cluster create <span class="s2">&quot;</span><span class="si">${</span><span class="nv">clustername</span><span class="si">}</span><span class="s2">&quot;</span> <span class="se">\</span>
--k3s-arg <span class="s1">&#39;--flannel-backend=none@server:*&#39;</span> <span class="se">\</span>
--volume <span class="s2">&quot;</span><span class="k">$(</span><span class="nb">pwd</span><span class="k">)</span><span class="s2">/docs/usage/guides/calico.yaml:/var/lib/rancher/k3s/server/manifests/calico.yaml&quot;</span>
</code></pre></div>
<p>In this example :</p>
<ul>
<li>change <code>"${clustername}"</code> with the name of the cluster (or set a variable).</li>
<li><code>$(pwd)/docs/usage/guides/calico.yaml</code> is the absolute path of the calico manifest, you can adapt it.</li>
</ul>
<p>You can add other options, <a href="../../commands/">see</a>. </p>
<p>The cluster will start without flannel and with Calico as CNI Plugin.</p>
<p>For watching for the pod(s) deployment</p>
<div class="highlight"><pre><span></span><code>watch <span class="s2">&quot;kubectl get pods -n kube-system&quot;</span>
</code></pre></div>
<p>You will have something like this at beginning (with the command line <code class="highlight">kubectl get pods -n kube-system</code>)</p>
<div class="highlight"><pre><span></span><code>NAME READY STATUS RESTARTS AGE
helm-install-traefik-pn84f <span class="m">0</span>/1 Pending <span class="m">0</span> 3s
calico-node-97rx8 <span class="m">0</span>/1 Init:0/3 <span class="m">0</span> 3s
metrics-server-7566d596c8-hwnqq <span class="m">0</span>/1 Pending <span class="m">0</span> 2s
calico-kube-controllers-58b656d69f-2z7cn <span class="m">0</span>/1 Pending <span class="m">0</span> 2s
local-path-provisioner-6d59f47c7-rmswg <span class="m">0</span>/1 Pending <span class="m">0</span> 2s
coredns-8655855d6-cxtnr <span class="m">0</span>/1 Pending <span class="m">0</span> 2s
</code></pre></div>
<p>And when it finish to start</p>
<div class="highlight"><pre><span></span><code>NAME READY STATUS RESTARTS AGE
metrics-server-7566d596c8-hwnqq <span class="m">1</span>/1 Running <span class="m">0</span> 56s
calico-node-97rx8 <span class="m">1</span>/1 Running <span class="m">0</span> 57s
helm-install-traefik-pn84f <span class="m">0</span>/1 Completed <span class="m">1</span> 57s
svclb-traefik-lmjr5 <span class="m">2</span>/2 Running <span class="m">0</span> 28s
calico-kube-controllers-58b656d69f-2z7cn <span class="m">1</span>/1 Running <span class="m">0</span> 56s
local-path-provisioner-6d59f47c7-rmswg <span class="m">1</span>/1 Running <span class="m">0</span> 56s
traefik-758cd5fc85-x8p57 <span class="m">1</span>/1 Running <span class="m">0</span> 28s
coredns-8655855d6-cxtnr <span class="m">1</span>/1 Running <span class="m">0</span> 56s
</code></pre></div>
<p>Note :</p>
<ul>
<li>you can use the auto deploy manifest or a kubectl apply depending on your needs</li>
<li><img alt="❗" class="twemoji" src="https://twemoji.maxcdn.com/v/latest/svg/2757.svg" title=":exclamation:" /> Calico is not as quick as Flannel (but it provides more features)</li>
</ul>
<h2 id="references">References<a class="headerlink" href="#references" title="Permanent link">&para;</a></h2>
<ul>
<li><a href="https://rancher.com/docs/k3s/latest/en/installation/network-options/">https://rancher.com/docs/k3s/latest/en/installation/network-options/</a> </li>
<li><a href="https://docs.projectcalico.org/getting-started/kubernetes/k3s/">https://docs.projectcalico.org/getting-started/kubernetes/k3s/</a></li>
</ul>
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