12 - multi-container-pods.md

Multi Container PODs

• There are 3 patterns:

  • sidecar
  • adapter
  • ambassador

• Sidecar:

  • Create 2 containers in a POD and sharing a volume, different mounthPaths but the same shared folder:

    apiVersion: v1
    kind: Pod
    metadata:
      name: two-containers
    spec:
    
      volumes:
      - name: shared-data
        emptyDir: {}
    
      containers:
    
      - name: nginx-container
        image: nginx
        volumeMounts:
        - name: shared-data
          mountPath: /usr/share/nginx/html
    
      - name: debian-container
        image: debian
        volumeMounts:
        - name: shared-data
          mountPath: /pod-data
        command: ["/bin/sh"]
        args: ["-c", "echo Hello from the debian container > /pod-data/index.html"]
    

• Doc:

  • https://kubernetes.io/docs/tasks/access-application-cluster/communicate-containers-same-pod-shared-volume/