Kubernetes Deployment Dependencies

second.yaml

---
apiVersion: v1
kind: Pod
metadata:
  name: second
  labels:
    app: simple-config
    component: second
spec:
  restartPolicy: Never
  initContainers:
  - name: wait
    image: alpine
    imagePullPolicy: Always
    command:
    - ash
    - -c
    - |
      apk --no-cache add curl
      # Endpoint to check
      ENDPOINT="http://$(SIMPLE_CONFIG_NAME):$(SIMPLE_CONFIG_PORT)/?variable=$(SIMPLE_CONFIG_PATH)"
      echo Checking: ${ENDPOINT}
      while [[ $(curl --silent --output /dev/null --request GET --write-out "%{http_code}" ${ENDPOINT}) -ne 200 ]]; do
        echo "Not ready"
        sleep 5s
      done
      echo Ready
    env:
    - name: SIMPLE_CONFIG_NAME
      value: simple-config
    - name: SIMPLE_CONFIG_PORT
      value: "9999"
    - name: SIMPLE_CONFIG_PATH
      # Matches the metadata.name of the test Pod
      value: first/container
  containers:
  - name: container
    image: busybox
    imagePullPolicy: Always
    args:
    - wget
    - --quiet
    - --output-document=-
    - --post-data={"variable":"$(SIMPLE_CONFIG_PATH)/dependent"}
    - http://$(SIMPLE_CONFIG_NAME):$(SIMPLE_CONFIG_PORT)
    env:
    - name: SIMPLE_CONFIG_NAME
      value: simple-config
    - name: SIMPLE_CONFIG_PORT
      value: "9999"
    - name: SIMPLE_CONFIG_PATH
      valueFrom:
        fieldRef:
          fieldPath: metadata.name
...