Page Comparison

Table of Contents

...

The following pod layout is desired for the APPC cluster deployment (as described in

Jira Legacy

server	System Jira
columns	key,summary,type,created,updated,due,assignee,reporter,priority,status,resolution
serverId	4733707d-2057-3a0f-ae5e-4fd8aff50176
key	APPC-476

) from POD and SERVICE view, which will have:

1 DB pod (2 or more DB pods to supported with the introduction of MariaDB and Galera)
3 appc (ODL) pods
1 dgbuilder pod
1 cdt pod

...

Gliffy

name	Pod, service, deploy kind Copy
pagePin	6

APPC DB Clustering details

...

Gliffy

name	sdnc pods start up order Copy
pagePin	2

Troubleshoot situation where APPC pods do not start up in order

...

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:
      ...

...

Versions Compared

Old Version 6

New Version 7

Key

APPC DB Clustering details

Troubleshoot situation where APPC pods do not start up in order