Kubernetes Proxy Sidecar Example

example.yaml

spec:
  restartPolicy: Never
  initContainers:
  - name: init
    image: busybox
    command: ["/bin/sh"]
    args: ["-c",
           "touch /tmp/shared-volume/migration.lock"]
    volumeMounts:
      - name: shared-volume
        mountPath: /tmp/shared-volume
  containers:
  - name: cloudsql-proxy
    image: gcr.io/cloudsql-docker/gce-proxy:1.11
    command: ["/bin/sh"]
    args: ["-c",
           "/cloud_sql_proxy --dir=/cloudsql -instances=${INSTANCE_NAME}=tcp:5432 & export pid=$!; until [[ ! -f /tmp/shared-volume/migration.lock ]]; do sleep 1; done; kill ${pid}"]
    volumeMounts:
      - name: shared-volume
        mountPath: /tmp/shared-volume
  - name: migration
    image: ${IMAGE}
    command: ["/bin/sh", "-c",
              "sleep 10; ${SOME_COMMAND}; rm -rf /tmp/shared-volume/migration.lock"]
    volumeMounts:
      - name: shared-volume
        mountPath: /tmp/shared-volume