docker-compose.yml

version: '3.9'
services:
  postgres-primary:
    image: postgres:15
    container_name: postgres-primary
    environment:
      POSTGRES_USER: postgres
      POSTGRES_PASSWORD: primary
      POSTGRES_DB: mydb
    ports:
      - "5432:5432"
    volumes:
      - pg_primary:/var/lib/postgresql/data
      - ./init-primary.sh:/docker-entrypoint-initdb.d/init-primary.sh
    networks:
      - postgres_net
    healthcheck:
      test: ["CMD-SHELL", "pg_isready -U postgres"]
      interval: 5s
      timeout: 5s
      retries: 5

  postgres-standby:
    image: postgres:15
    container_name: postgres-standby
    environment:
      POSTGRES_USER: postgres
      POSTGRES_PASSWORD: standby
      PGPASSWORD: replica_pass
    depends_on:
      postgres-primary:
        condition: service_healthy
    ports:
      - "5433:5432"
    volumes:
      - pg_standby:/var/lib/postgresql/data
      - ./standby-entrypoint.sh:/standby-entrypoint.sh
    entrypoint: ["/standby-entrypoint.sh"]
    networks:
      - postgres_net

volumes:
  pg_primary:
  pg_standby:

networks:
  postgres_net: