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Docker Compose and MySQL

Docker Compose and MySQL

Learn how to launch multiple containers using Compose.

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Launch multiple containers with Docker Compose

Starting Docker containers individually is not fun, especially when commands are long and difficult to remember. Fortunately, Docker Compose provides a way to build and launch containers, networks, and volumes from a single configuration file named docker-compose.yml.

YAML is a cheeky mnemonic for YAML Ain’t Markup Language, a common, compact data format often used for configuration purposes. It uses new lines and tab stops rather than the quotes and brackets favored by JSON.

Docker Compose offers many configuration options, but an example is the best way to illustrate common settings. Let’s consider following docker-compose.yml:

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version: '3'
services:
  mysql:
    image: mysql
    container_name: mysql
    environment:
      - MYSQL_ROOT_PASSWORD=mysecret
    volumes:
      - mysqldata:/var/lib/mysql
    ports:
      - "3000:3306"
    networks:
      - mysqlnet
    restart: on-failure
  adminer:
    image: adminer
    container_name: adminer
    depends_on:
      - mysql
    ports:
      - "8080:8080"
    networks:
      - mysqlnet
    restart: on-failure
volumes:
  mysqldata:
networks:
  mysqlnet:

This creates identical containers to the docker run commands you used earlier with the volumes and networks listed at the bottom. It also defines two new ...