How to pass args to pods based on Ordinal Index in StatefulSets?

Question

Is it possible to pass different args to pods based on their ordinal index in StatefulSets? Didn\'t find the answer on the StatefulSets documentation. Thanks!

Answer 1

I found one less hacky way to pass in ordinal index into container using the lifecycle hooks

  containers:
  - name: cp-kafka
    imagePullPolicy: Always
    image: confluentinc/cp-kafka:4.0.0
    resources:
      requests:
        memory: "2Gi"
        cpu: 0.5
    ports:
    - containerPort: 9093
      name: server
      protocol: TCP
    lifecycle:
      postStart:
        exec:
          command: ["/bin/sh", "-c", "export KAFKA_BROKER_ID=${HOSTNAME##*-}"]
    env:
      - name: KAFKA_ZOOKEEPER_CONNECT
        value: zk-cs.default.svc.cluster.local:2181
      - name: KAFKA_ADVERTISED_LISTENERS
        value: PLAINTEXT://localhost:9093