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Table of Contents

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About the APPC-C Clustering

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

Jira Legacy
serverSystem Jira
columnskey,summary,type,created,updated,due,assignee,reporter,priority,status,resolution
serverId4733707d-2057-3a0f-ae5e-4fd8aff50176
keyAPPC-476
) from POD and SERVICE view, which will have:

  • 2 DB pods
  • 3 appc (ODL) pods
  • 1 admin (portal) pod1 dgbuilder pod

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APPC DB Clustering details

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Additional Information

APPC Startup Order

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Troubleshoot situation where APPC pods do not start up in order

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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 greaterinitContainers 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
    languagexml
    titleAn example of init container by beta annotation
    linenumberstrue
    collapsetrue
    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
    languagexml
    titleAn example of init container by spec.initContainers
    linenumberstrue
    collapsetrue
    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:
      ...

Restart Dead Instance (start a new one in its place)

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