docker-compose.yml

version: '2'
services:
    master:
        image: mariadb:10.3
        environment:
            MYSQL_ALLOW_EMPTY_PASSWORD: 'Y'
        volumes:
            - ./sql/master:/docker-entrypoint-initdb.d
        command: mysqld --log-bin=mariadb-bin --binlog-format=ROW --server-id=3000 --log-slave-updates
        ports:
            - "4001:3306"

    slave1:
        image: mariadb:10.3
        depends_on:
            - master
        environment:
            MYSQL_ALLOW_EMPTY_PASSWORD: 'Y'
        volumes:
            - ./sql/slave:/docker-entrypoint-initdb.d
        command: mysqld --log-bin=mariadb-bin --binlog-format=ROW --server-id=3001 --log-slave-updates
        ports:
            - "4002:3306"

    slave2:
        image: mariadb:10.3
        depends_on:
            - master
        environment:
            MYSQL_ALLOW_EMPTY_PASSWORD: 'Y'
        volumes:
            - ./sql/slave:/docker-entrypoint-initdb.d
        command: mysqld --log-bin=mariadb-bin --binlog-format=ROW --server-id=3002 --log-slave-updates
        ports:
            - "4003:3306"

    maxscale:
        image: mariadb/maxscale:2.4
        depends_on:
            - master
            - slave1
            - slave2
        volumes:
            - ./maxscale.cnf.d:/etc/maxscale.cnf.d
        ports:
            - "4006:4006"  # readwrite port
            - "4008:4008"  # readonly port
            - "8989:8989"  # REST API port