docker-compose.yml

version: "3.8"

services: 
  runner:
    image: mysql:latest
    environment:
      - "MYSQL_ROOT_PASSWORD=rootpass"
      - "MYSQL_MASTER_PASSWORD=rootpass"
      - "MYSQL_SLAVE_PASSWORD=rootpass"
      - "MYSQL_REPLICATION_USER=root"
      - "MYSQL_REPLICATION_PASSWORD=rootpass"
    volumes:
      - ./mysql_runner.sh:/tmp/mysql_runner.sh
    command: /bin/bash -x /tmp/mysql_runner.sh
    depends_on: 
      - master
      - slave
  master:
    image: mysql:latest
    volumes: 
      - ./conf/master.cnf:/etc/mysql/my.cnf
      - ./data/master:/var/lib/mysql
    ports: 
      - 3306:3306
    environment: 
      MYSQL_ROOT_PASSWORD: "rootpass"
      MYSQL_DATABASE: "pets"
      MYSQL_USER: "master"
      MYSQL_PASSWORD: "masterpassword"
  slave:
    image: mysql:latest
    volumes: 
      - ./conf/slave.cnf:/etc/mysql/my.cnf
      - ./data/slave:/var/lib/mysql
    ports: 
      - 3307:3306
    environment: 
      MYSQL_ROOT_PASSWORD: "rootpass"
      MYSQL_DATABASE: "pets"
      MYSQL_USER: "slave"
      MYSQL_PASSWORD: "slavepassword"
    deploy:
      replicas: 3
      placement:
        max_replicas_per_node: 1
      update_config:
        parallelism: 2
        delay: 10s
      restart_policy:
        condition: on-failure