postgres-deployment.yaml

apiVersion: v1
kind: Service
metadata:
  name: postgres-service
spec:
  ports:
    - port: 5432
  selector:
    app: postgres
---
apiVersion: v1
kind: ConfigMap
metadata:
  name: postgres-initdb-config
data:
  init-user-db.sh: |
    #!/bin/bash
    set -e

    psql -v ON_ERROR_STOP=1 --username "$POSTGRES_USER" --dbname "$POSTGRES_DB" <<-EOSQL
        CREATE DATABASE booksdb;
    EOSQL
---
kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: postgres-data
  annotations:
    volume.alpha.kubernetes.io/storage-class: default
spec:
  accessModes: [ReadWriteOnce]
  resources:
    requests:
      storage: 5Gi
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: postgres
  labels:
    app: postgres
spec:
  replicas: 1
  selector:
    matchLabels:
      app: postgres
  template:
    metadata:
      labels:
        app: postgres
    spec:
      containers:
        - name: postgres
          image: postgres
          resources:
            requests:
              memory: "300Mi"
              cpu: "500m"
            limits:
              memory: "400Mi"
              cpu: "600m"
          ports:
            - containerPort: 5432
          env:
            - name: PGDATA
              value: /data/postgres
            - name: POSTGRES_USER
              valueFrom:
                secretKeyRef:
                  name: postgres-db
                  key: username
            - name: POSTGRES_PASSWORD
              valueFrom:
                secretKeyRef:
                  name: postgres-db
                  key: password
          volumeMounts:
            - mountPath: "/var/lib/postgresql/data"
              name: data
              subPath: data
            - mountPath: /docker-entrypoint-initdb.d/
              name: postgres-initdb
      volumes:
        - name: data
          persistentVolumeClaim:
            claimName: postgres-data
        - name: postgres-initdb
          configMap:
            name: postgres-initdb-config