https://uclab.dev/tags/architecture/ Recent content in Architecture on DevOps von UCLAB Hugo en Wed, 04 Mar 2026 09:13:32 +0000 https://uclab.dev/posts/k8s-arch/ Wed, 04 Mar 2026 09:13:32 +0000 https://uclab.dev/posts/k8s-arch/ <figure><img src="https://uclab.dev/posts/k8s-arch/images/k8s_arch.jpeg" alt="K8S"> </figure> <hr> <p>If you&rsquo;ve ever stared at a Kubernetes diagram and felt your eyes glaze over, you&rsquo;re not alone. Let&rsquo;s break it down simply.</p> <h2 id="the-two-big-pieces-control-plane--worker-nodes">The Two Big Pieces: Control Plane &amp; Worker Nodes</h2> <p>Kubernetes splits its responsibilities cleanly into two halves.</p> <p>The <strong>Control Plane</strong> (the master) is the brain of the cluster. It&rsquo;s made up of four key components:</p> <ul> <li><strong>API Server</strong> — every request goes through here, no exceptions</li> <li><strong>etcd</strong> — a key-value store that holds all cluster state and data</li> <li><strong>Scheduler</strong> — decides which node a new Pod should run on</li> <li><strong>Controller Manager</strong> — constantly watches the cluster and reconciles the actual state with the desired state (think Replica, Node, and Job controllers)</li> </ul> <p>The <strong>Worker Nodes</strong> (minions) are where your actual workloads run. Each node runs:</p>