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name	APPC POD Startup Order
pagePin	1

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Table of Contents

Note, this page is based on the SDNC-C Clustering on Kubernetes page as created by Beili Zhou.

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Do a describe of the pod using command kubectl describe pod <pod-name>, to ensure the Init Container section is presented as your defined in your yaml template.

If it does not exist, it is possible that your Kubernetes version supports a different format for the init-containers:

init-containers syntax supported by Kubernetes 1.5, 1.6 and 1.7 and not supported by Kubernetes 1.8 and greater

initContainers syntax supported from Kubernetes 1.6 and greater

Init container is defined under

spec.template.metadata.annotations."pod.beta.kubernetes.io/init-containers

Code Block

language	xml
title	An example of init container by beta annotation
linenumbers	true
collapse	true

apiVersion: apps/v1beta1
kind: StatefulSet
metadata:
  name: appc
  ...
spec:
  ...
  template:
    metadata:
      ...
      annotations:
        pod.beta.kubernetes.io/init-containers: '[
          {
              "args": [
                  "--container-name",
                  "appc-db-container"
              ],
              "command": [
                  "/root/ready.py"
              ],
              "env": [
                  {
                      "name": "NAMESPACE",
                      "valueFrom": {
                          "fieldRef": {
                              "apiVersion": "v1",
                              "fieldPath": "metadata.namespace"
                          }
                      }
                  }
              ],
              "image": "{{ .Values.image.readiness }}",
              "imagePullPolicy": "{{ .Values.pullPolicy }}",
              "name": "appc-readiness"
          }
          ]'
    spec:
      containers:
      ...

Init container is defined under spec.template.spec.initContainers

Code Block

language	xml
title	An example of init container by spec.initContainers
linenumbers	true
collapse	true

apiVersion: apps/v1beta1
kind: StatefulSet
metadata:
  name: sdnc
  ...
spec:
  ...
  template:
    ...
    spec:
      initContainers:
      - command:
        - /root/ready.py
        - "--container-name"
        - "appc-db-container"
        env:
        - name: NAMESPACE
          valueFrom:
            fieldRef:
              apiVersion: v1
              fieldPath: metadata.namespace
        image: "{{ .Values.image.readiness }}"
        imagePullPolicy: {{ .Values.pullPolicy }}
        name: appc-readiness
      containers:
      ...

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