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.opencode/skills/devops/references/kubernetes-basics.md

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+# Kubernetes Core Concepts
+
+## Cluster Architecture
+
+```
+CONTROL PLANE                    WORKER NODES
+├── API Server (kubectl)         ├── Kubelet (node agent)
+├── Scheduler (pod placement)    ├── Kube-proxy (networking)
+├── Controller Manager           └── Container Runtime
+└── etcd (cluster state)
+```
+
+## Pod
+```yaml
+apiVersion: v1
+kind: Pod
+metadata:
+  name: myapp-pod
+spec:
+  containers:
+  - name: myapp
+    image: myapp:1.0
+    ports:
+    - containerPort: 8080
+    resources:
+      requests: { memory: "256Mi", cpu: "250m" }
+      limits: { memory: "512Mi", cpu: "500m" }
+```
+
+## Deployment
+```yaml
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: myapp
+spec:
+  replicas: 3
+  strategy:
+    type: RollingUpdate
+    rollingUpdate: { maxSurge: 1, maxUnavailable: 0 }
+  selector:
+    matchLabels: { app: myapp }
+  template:
+    metadata:
+      labels: { app: myapp }
+    spec:
+      containers:
+      - name: myapp
+        image: myapp:1.0
+```
+
+## Service
+```yaml
+apiVersion: v1
+kind: Service
+metadata:
+  name: myapp-service
+spec:
+  type: ClusterIP  # ClusterIP, NodePort, LoadBalancer
+  selector: { app: myapp }
+  ports:
+  - port: 8080
+    targetPort: 8080
+```
+
+## ConfigMap & Secret
+```yaml
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: app-config
+data:
+  DATABASE_HOST: "postgres.svc.cluster.local"
+---
+apiVersion: v1
+kind: Secret
+type: Opaque
+stringData:
+  password: secretpassword
+```
+
+## Workload Types
+
+| Type | Use Case |
+|------|----------|
+| Deployment | Stateless apps |
+| StatefulSet | Databases |
+| DaemonSet | One per node |
+| Job | Batch tasks |
+| CronJob | Scheduled |
+
+## Labels
+```yaml
+labels:
+  app: myapp
+  version: v1.0.0
+  tier: frontend
+  environment: prod
+```