Create MySQL DBs for master-slave replication (https://victoronsoftware.com/posts/mysql-master-slave-replication/)

docker-compose.yml

---
version: "2"
services:
  mysql_master:
    image: mysql:8.0
    volumes:
      - mysql-replica-main:/tmp
    command:
      [
        "mysqld",
        "--datadir=/tmp/mysqldata-replica-main",
        "--log-bin=bin.log",
        "--server-id=1"
      ]
    environment:
      &mysql-default-environment
      MYSQL_ROOT_PASSWORD: toor
      MYSQL_DATABASE: test
      MYSQL_USER: test_user
      MYSQL_PASSWORD: insecure
    ports:
      - "3308:3306"

  mysql_slave:
    image: mysql:8.0
    volumes:
      - mysql-replica-read:/tmp
    command:
      [
        "mysqld",
        "--datadir=/tmp/mysqldata-replica-read",
        "--log-bin=bin.log",
        "--server-id=2"
      ]
    environment: *mysql-default-environment
    ports:
      - "3309:3306"

volumes:
  mysql-replica-main:
  mysql-replica-read: