postgres.yaml

apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: postgres-statefulset
  labels:
    app: postgres
spec:
  serviceName: "postgres"
  replicas: 1
  selector:
    matchLabels:
      app: postgres
  template:
    metadata:
      labels:
        app: postgres
    spec:
      containers:
      - name: postgres
        image: postgres:13.2
        env:
        - name: POSTGRES_USER
          valueFrom:
            secretKeyRef:
              name: database-credentials
              key: username
        - name: POSTGRES_PASSWORD
          valueFrom:
            secretKeyRef:
              name: database-credentials
              key: password
        - name: POSTGRES_DB
          value: appdb
        - name: PGDATA
          value: /var/lib/postgresql/data/pgdata
        ports:
        - containerPort: 5432
          name: postgresdb
        volumeMounts:
        - name: postgres-data
          mountPath: /var/lib/postgresql/data
      volumes:
      - name: postgres-data
        hostPath:
          path: /tmp/postgresdata
          type: DirectoryOrCreate