Example Postgres deployment, utilizing a configMap and secret

configmap.yaml

apiVersion: v1
data:
  PGDATA: /var/lib/postgres
kind: ConfigMap
metadata:
  name: postgres-env-vars

deploy.yaml

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: postgres
  labels:
    app: postgres
spec:
  replicas: 1
  selector:
    matchLabels:
      app: postgres
  strategy:
    type: Recreate
  template:
    metadata:
      labels:
        app: postgres
    spec:
      containers:
      - image: library/postgres:9.6-alpine
        name: postgres
        readinessProbe:
          tcpSocket:
            port: 5432
          initialDelaySeconds: 120
          periodSeconds: 30
        livenessProbe:
          tcpSocket:
            port: 5432
          initialDelaySeconds: 120
          periodSeconds: 30
        env:
        - name: POSTGRES_PASSWORD
          valueFrom:
            secretKeyRef:
              name: postgres-creds
              key: POSTGRES_PASSWORD
        - name: POSTGRES_USER
          valueFrom:
            secretKeyRef:
              name: postgres-creds
              key: POSTGRES_USER
        - name: POSTGRES_DB
          valueFrom:
            secretKeyRef:
              name: postgres-creds
              key: POSTGRES_DB
        - name: PGDATA
          valueFrom:
            configMapKeyRef:
              name: postgres-env-vars
              key: PGDATA
        ports:
        - containerPort: 5432
          name: postgres

secret.yaml

apiVersion: v1
data:
  POSTGRES_DB: dGVzdGRi
  POSTGRES_PASSWORD: dGVzdHB3
  POSTGRES_USER: dGVzdHVzZXI=
kind: Secret
metadata:
  name: postgres-creds
type: Opaque