kubernetes-patterns

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SKILL.md (first lines)

# Kubernetes Patterns

Production-grade Kubernetes deployment and pod design patterns.

## Pod Design Patterns

```yaml
# Sidecar Pattern: log collector alongside main app
apiVersion: v1
kind: Pod
metadata:
  name: app-with-sidecar
spec:
  containers:
    - name: app
      image: myapp:v1.2.0
      ports:
        - containerPort: 8080
      volumeMounts:
        - name: logs
          mountPath: /var/log/app

    - name: log-collector
      image: fluentd:v1.16
      volumeMounts:
        - name: logs
          mountPath: /var/log/app
          readOnly: true

  volumes:
    - name: logs
      emptyDir: {}
```

## Init Containers

```yaml
# Run setup tasks before main container starts
apiVersion: apps/v1
kind: Deployment
metadata:
  name: api-server
spec:
  replicas: 3
  template:
    spec:
      initContainers:
        # Wait for database to be ready
        - name: wait-for-db
          image: busybox:1.36
          command: ['sh', '-c', 'until nc -z postgres-svc 5432; do sleep 2; done']

        # Run database migrations
        - name: run-migrations
          image: myapp:v1.2.0
          command: ['npx', 'prisma', 'migrate', 'deploy']
          envFrom:
            - secretRef:
                name: db-credentials

      containers:
        - name: api
          image: myapp:v1.2.0
          ports:
            - containerPort: 3000
```

## Resource Limits and Requests

```yaml
containers:
  - name: api
    image: myapp:v1.2.0
    resources:
      requests:          # Scheduler uses this to place pods
        cpu: 250m        # 0.25 CPU cores
        memory: 256Mi    # 256 MB
      limits:            # OOM kill / CPU throttle beyond this
        cpu: 500m        # 0.5 CPU cores
        memory: 512Mi    # 512 MB

    # Liveness: restart container if health check fails
    livenessProbe:
      httpGet:
        path: /healthz
        port: 3000
      initialDelaySeconds: 15
      periodSeconds: 10
      failureThreshold: 3

    # Readiness: remove from service if not ready (no traffic)
    readinessProbe:
      httpGet:
        path: /ready
        port: 3000
      initialDelaySeconds: 5
      periodSeconds: 5

    # Startup: disable liveness/readiness until app starts
    startupProbe:
      httpGet:
        path: /healthz
        port: 3000
      failureThreshold: 30    # 30 * 10s = 5 min max startup
      periodSeconds: 10
```

## ConfigMap and Secrets

```yaml
# ConfigMap for non-sensitive config
apiVersion: v1
kind: ConfigMap
metadata:
  name: app-config
data:
  LOG_LEVEL: "info"
  MAX_CONNECTIONS: "100"
  FEATURE_NEW_UI: "true"

From vibeeval/vibecosystem, MIT.

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