docker-compose.yml

version: '3'

services:
  master:
    image: twang2218/mysql:5.7-replica
    restart: unless-stopped
    ports:
      - 3306:3306
    environment:
      - MYSQL_ROOT_PASSWORD=LwBbWSYNfr97z491cIKqUB1
      - MYSQL_REPLICA_USER=replica
      - MYSQL_REPLICA_PASS=Bwsqz472lQbodZ7n4TIFyU
    command: ["mysqld", "--log-bin=mysql-bin", "--server-id=1"]
    healthcheck:
      test: mysqladmin -h localhost -P 3306 ping --silent
      interval: 10s
      retries: 60
    volumes:
      - mysql-master-data:/var/lib/mysql

  slave:
    image: twang2218/mysql:5.7-replica
    restart: unless-stopped
    ports:
      - 3307:3306
    depends_on:
      - master
    environment:
      - MYSQL_ROOT_PASSWORD=LwBbWSYNfr97z491cIKqUB1
      - MYSQL_REPLICA_USER=replica
      - MYSQL_REPLICA_PASS=Bwsqz472lQbodZ7n4TIFyU
      - MYSQL_MASTER_SERVER=master
      - MYSQL_MASTER_WAIT_TIME=10
    command: ["mysqld", "--log-bin=mysql-bin", "--server-id=2"]
    healthcheck:
      test: mysqladmin -h localhost -P 3306 ping --silent
      interval: 10s
      retries: 60
    volumes:
      - mysql-slave-data:/var/lib/mysql

  memcached:
    image: memcached:alpine
    restart: unless-stopped
    ports:
      - 11211:11211 
    healthcheck:
      test: echo stats | nc 127.0.0.1 11211
      interval: 10s
      retries: 60

  hello:
    container_name: hello
    image: hello:latest
    build: .
    environment:
      HELLO_SQLALCHEMY_DATABASE_URI: 'mysql+pymysql://root:LwBbWSYNfr97z491cIKqUB1@master/hello'
      HELLO_BINDS_MASTER: 'mysql+pymysql://root:LwBbWSYNfr97z491cIKqUB1@master/hello'
      HELLO_BINDS_SLAVE: 'mysql+pymysql://root:LwBbWSYNfr97z491cIKqUB1@slave/hello'
      HELLO_SQLALCHEMY_TRACK_MODIFICATIONS: 'false'
      HELLO_MEMCACHED_HOST: 'memcached'
    depends_on:
      - master
      - slave
      - memcached
    ports:
      - "5000:5000"
    healthcheck:
      test: curl --fail http://localhost:5000/health || exit 1

volumes:
  mysql-master-data:
    driver: local
  mysql-slave-data:
    driver: local

networks:
  default:
    external:
      name: hello