Creating docker compose files for development and production 【Docker】

When I use docker compose yml file, environment variables can be changed depending on the environment such as development and production. In that case, you can write file like below.

# docker-compose.development.yml

services:
  db:
    extends:
      file: docker-compose.yml
      service: db
    env_file: .env.development
  web:
    extends:
      file: docker-compose.yml
      service: web
    env_file: .env.development
  mail:
    extends:
      file: docker-compose.yml
      service: mail

volumes:
  mysql:
    name: exa_volume

networks:
  example_default:
    external: true

and production is…

# docker-compose.production.yml

services:
  db:
    extends:
      file: docker-compose.yml
      service: db
    env_file: .env.production
  web:
    extends:
      file: docker-compose.yml
      service: web
    env_file: .env.production

volumes:
  mysql:
    name: example_volume

networks:
  example_default:
    external: true

Of course two files above have common yml file.

# this file can be used for running golang.
version: '3'
services:
  db:
    build: 
      context: .
      dockerfile: ./docker/db/Dockerfile
    image: mysql
    container_name: example_DB
    command: --default-authentication-plugin=mysql_native_password
    ports:
      - 3306:3306
    volumes: 
      - ./mysql/:/docker-entrypoint-initdb.d
      - ./mysql/my.cnf:/etc/mysql/my.cnf
    networks:
      - example_default
  web:
    build: 
      context: .
      dockerfile: ./docker/web/Dockerfile
    tty: true
    command: go run .
    volumes:
      - .:/go/src/projects/example
    ports:
      - "3000:3000"
    networks:
      - example_default
  mail:
    image: mailhog/mailhog
    container_name: example_mail
    ports:
      - 8025:8025

volumes:
  mysql:
    name: example_volume

networks:
  example_default:
    external: true

The command for running docker is below.

docker-compose -f docker-compose.production.yml up

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