app.yaml

apiVersion: v1
kind: ConfigMap
metadata:
  name: postgres-config
  labels:
    app: postgres
data:
  POSTGRES_DB: postgresdb
  POSTGRES_USER: $USERNAME
  POSTGRES_PASSWORD: $PASSWORD
  PGDATA: /var/lib/postgresql/data/pgdata
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: postgresql-pv-claim
spec:
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: $VOLUME_SIZE
---
apiVersion: v1
kind: Service
metadata:
  name: postgresql
spec:
  ports:
    - port: 5432
  selector:
    app: postgresql
  clusterIP: None
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: postgresql
spec:
  selector:
    matchLabels:
      app: postgresql
  strategy:
    type: Recreate
  template:
    metadata:
      labels:
        app: postgresql
    spec:
      securityContext:
        runAsUser: 1000
        runAsGroup: 1000
        fsGroup: 1000
      containers:
      - image: postgres:11.5
        name: postgresql
        envFrom:
          - configMapRef:
              name: postgres-config
        volumeMounts:
          - name: postgresql-persistent-storage
            mountPath: /var/lib/postgresql/data
        ports:
        - containerPort: 5432
          name: postgresql
      volumes:
      - name: postgresql-persistent-storage
        persistentVolumeClaim:
          claimName: postgresql-pv-claim