docker-compose.yml

---
version: '3.8'

services:
  postgresql-db:
    image: postgres:13
    ports:
      - "5432:5432"
    environment:
      - POSTGRES_USER=django
      - POSTGRES_PASSWORD=passwd123
      - POSTGRES_DB=db

  mysql-db:
    image: mysql:8
    ports:
      - "3306:3306"
    restart: unless-stopped
    environment:
      - MYSQL_USER=django
      - MYSQL_PASSWORD=passwd123
      # NOTE: MySQL container entrypoint gives user `${MYSQL_USER}` access
      # only to `${MYSQL_DATABASE}` database, so we are setting
      # `${MYSQL_DATABASE}` to Django default test database's name to avoid
      # overriding `ENTRYPOINT` or `CMD`.
      - MYSQL_DATABASE=test_db
      - MYSQL_ROOT_PASSWORD=superpasswd123
    command: --default-authentication-plugin=mysql_native_password

  maria-db:
    image: mariadb:10
    ports:
      - "3307:3306"
    restart: unless-stopped
    environment:
      - MARIADB_USER=django
      - MARIADB_PASSWORD=passwd123
      # NOTE: MySQL container entrypoint gives user `${MYSQL_USER}` access
      # only to `${MYSQL_DATABASE}` database, so we are setting
      # `${MYSQL_DATABASE}` to Django default test database's name to avoid
      # overriding `ENTRYPOINT` or `CMD`.
      - MARIADB_DATABASE=test_db
      - MARIADB_ROOT_PASSWORD=superpasswd123
    command: --default-authentication-plugin=mysql_native_password