docker-compose.yml

---
version: "2"
services:
  shard1:
    image: mysql:8.0
    container_name: app-shard-1
    restart: always
    volumes:
      - ./database-initialization.sql:/docker-entrypoint-initdb.d/database-initialization.sql
      - shard-1-data:/var/lib/mysql
    environment:
      &mysql-default-environment
      MYSQL_ROOT_PASSWORD: toor
      MYSQL_DATABASE: test
    ports:
      - "3308:3306"
  shard2:
    image: mysql:8.0
    container_name: app-shard-2
    restart: always
    volumes:
      - ./database-initialization.sql:/docker-entrypoint-initdb.d/database-initialization.sql
      - shard-2-data:/var/lib/mysql
    environment: *mysql-default-environment
    ports:
      - "3309:3306"
  shard3:
    image: mysql:8.0
    container_name: app-shard-3
    restart: always
    volumes:
      - ./database-initialization.sql:/docker-entrypoint-initdb.d/database-initialization.sql
      - shard-3-data:/var/lib/mysql
    environment: *mysql-default-environment
    ports:
      - "3310:3306"
  shard4:
    image: mysql:8.0
    container_name: app-shard-4
    restart: always
    volumes:
      - ./database-initialization.sql:/docker-entrypoint-initdb.d/database-initialization.sql
      - shard-4-data:/var/lib/mysql
    environment: *mysql-default-environment
    ports:
      - "3311:3306"        

volumes:
  shard-1-data:
  shard-2-data:
  shard-3-data:
  shard-4-data: