DevOps Intermediate

Container Orchestration Patterns¶

KubernetesPatternsContainerizationArchitecture 6 min read

Návrhové vzory pro kontejnerovou orchestraci. Sidecar, Ambassador, Adapter, Init Container a další.

Sidecar Pattern¶

Sidecar kontejner rozšiřuje hlavní kontejner o funkcionalitu: logging, monitoring, proxy.

spec:
  containers:
    - name: app
      image: myapp:latest
      ports:
        - containerPort: 8080
    - name: log-shipper
      image: fluent-bit:latest
      volumeMounts:
        - name: logs
          mountPath: /var/log/app
  volumes:
    - name: logs
      emptyDir: {}

Init Container Pattern¶

Init containers běží před hlavním kontejnerem. Použití: migrace, wait-for-dependency, config setup.

spec:
  initContainers:
    - name: wait-for-db
      image: busybox
      command: ['sh', '-c',
        'until nc -z postgres 5432; do sleep 2; done']
    - name: db-migrate
      image: myapp:latest
      command: ['./migrate', 'up']
  containers:
    - name: app
      image: myapp:latest

Ambassador Pattern¶

Ambassador kontejner funguje jako proxy pro hlavní kontejner — TLS termination, connection pooling, circuit breaking.

spec:
  containers:
    - name: app
      image: myapp:latest
      env:
        - name: DB_HOST
          value: localhost  # connects via ambassador
    - name: cloudsql-proxy
      image: gcr.io/cloudsql-docker/gce-proxy:latest
      command:
        - /cloud_sql_proxy
        - -instances=project:region:db=tcp:5432

Adapter Pattern¶

Adapter kontejner transformuje výstup hlavního kontejneru do standardního formátu (např. custom metrics → Prometheus format).

Summary¶

Multi-container patterns (Sidecar, Init, Ambassador, Adapter) řeší cross-cutting concerns bez modifikace aplikačního kódu.

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