write out a config file to a PVCs wihin an initContainer

initContainerPvcWrite.sh

#!/bin/bash
cat | oc create -f  - <<EOF
---
apiVersion: "v1"
kind: "PersistentVolumeClaim"
metadata:
  name: "config-data-claim"
spec:
  accessModes:
    - "ReadWriteMany"
  resources:
    requests:
      storage: "1Gi"
---
apiVersion: v1
kind: Pod
metadata:
  name: my-app
spec:
  containers:
  - name: realworld
    image: docker.io/simonmassey/react-redux-realworld:v0.0.2
    env:
    - name: API_ROOT
      value: https://conduit.productionready.io/api
    volumeMounts:
    - mountPath: /data
      name: config-data-claim
  initContainers:
  - name: config-data
    image: busybox
    command: ["sh", "-c", "echo {'address':'10.0.1.192:2379/db'} > /data/config"]
    volumeMounts:
    - mountPath: /data
      name: config-data-claim
  volumes:
  - name: config-data-claim
    persistentVolumeClaim:
      claimName: config-data-claim
EOF