db pod spec with CrashLoopBackOff fixed

db-pod.yaml

apiVersion: v1
kind: Pod
metadata:
  name: db
  labels:
    app: postgres
    role: database
    tier: back
spec:
  containers:
    - name: db
      image: postgres:9.4
      env:
        - name: POSTGRES_HOST_AUTH_METHOD
          value: trust
      ports:
        - containerPort: 5432
      volumeMounts:
      - name: db-data
        mountPath: /var/lib/postgresql/data
  volumes:
  - name: db-data
    hostPath:
      path: /var/lib/pgdata
      type: DirectoryOrCreate