https://ethanzyf.com/tags/devops/Recent content in Devops on Ethan-ZYFHugoen-usWed, 01 Jul 2026 00:00:00 +0000https://ethanzyf.com/blog/k8s-day1-notes/Wed, 01 Jul 2026 00:00:00 +0000https://ethanzyf.com/blog/k8s-day1-notes/<h2 id="environment-setup-day-0"> Environment Setup (Day 0) <a class="heading-link" href="#environment-setup-day-0"> <i class="fa-solid fa-link" aria-hidden="true" title="Link to heading"></i> <span class="sr-only">Link to heading</span> </a> </h2> <p><strong>Cluster:</strong> kind (Kubernetes in Docker) — 1 control-plane + 2 worker nodes, Cilium CNI.</p> <p>Key <code>kind-cluster.yaml</code> decisions:</p> <table> <thead> <tr> <th>Field</th> <th>Value</th> <th>Why</th> </tr> </thead> <tbody> <tr> <td><code>disableDefaultCNI</code></td> <td><code>true</code></td> <td>Remove kindnet, install Cilium manually</td> </tr> <tr> <td><code>podSubnet</code></td> <td><code>10.244.0.0/16</code></td> <td>~65k addresses for Pods</td> </tr> <tr> <td><code>serviceSubnet</code></td> <td><code>10.96.0.0/16</code></td> <td>Virtual IPs for Services, must not overlap podSubnet</td> </tr> <tr> <td><code>extraPortMappings</code></td> <td>80/443</td> <td>Map host ports into control-plane for Day 4 Ingress</td> </tr> <tr> <td><code>ingress-ready=true</code> label</td> <td>via <code>kubeadmConfigPatches</code></td> <td>Tells ingress-nginx which node to schedule on</td> </tr> </tbody> </table> <p><code>kubeadmConfigPatches</code> embeds a <strong>kubeadm YAML string</strong> inside kind&rsquo;s YAML (using <code>|</code> block scalar). Two separate schemas nested together — easy to confuse.</p>