Docker file to setup WordPress, MariaDb, PhpMyAdmin.

docker-compose.yml

# ref - https://pawelgrzybek.com/configure-a-local-wordpress-development-using-docker/
# ref - https://hub.docker.com/_/wordpress

# Step 1. Create Dir where you want to setup you new WordPress project
# Step 2. Create a file named as 'docker-compose.yml'
# Step 3. Copy this file content into that newly created file.

# docker-compose up -d (start all services)
# docker-compose down (stop all services)
# docker-compose kill (forcefully stop all services)

# Version of the Compose file format
# Version 3 is the most current and recommended one
version: "3"

# Top building block that defines
# All containers used for this service
services:

  # Container 1
  # https://hub.docker.com/_/mysql
  db:
    # Image name (optinally version)
    # https://docs.docker.com/compose/compose-file/#image
    image: mariadb
    # Define restart policy
    # https://docs.docker.com/compose/compose-file/#restart
    restart: always
    # Volumes definition
    # Named volume, allows persisted data but without caring where locally it is stored
    # https://nickjanetakis.com/blog/docker-tip-28-named-volumes-vs-path-based-volumes
    volumes:
      - db_data:/var/lib/mysql
    # Add environment variables
    # https://docs.docker.com/compose/compose-file/#environment
    environment:
      MYSQL_ROOT_PASSWORD: password
      MYSQL_DATABASE: wordpress
      MYSQL_USER: wordpress
      MYSQL_PASSWORD: wordpress
    # List of networks to join
    networks:
      - wp

  # Container 2
  # https://hub.docker.com/_/wordpress
  wordpress:
    # List of dependencies
    depends_on:
      - db
    # Image name (optinally version)
    # https://docs.docker.com/compose/compose-file/#image
    # Feel free to add a version of WordPress
    # I.e. wordpress:5.2.0
    image: wordpress
    # Define restart policy
    # https://docs.docker.com/compose/compose-file/#restart
    restart: always
    # Volumes definition
    # https://docs.docker.com/compose/compose-file/#volumes
    # Maps your local folder, to path in a container
    # Useful for file edits
    # I like to map only wp-content
    # We should not care about WP core files
    volumes: ["./:/var/www/html/wp-content"]
    # Add environment variables
    # https://docs.docker.com/compose/compose-file/#environment
    environment:
      WORDPRESS_DB_HOST: db:3306
      WORDPRESS_DB_USER: wordpress
      WORDPRESS_DB_PASSWORD: wordpress
    # Ports mapping
    ports:
      - 8181:80
      # - 443:443
    # List of networks to join
    networks:
      - wp

  # Container 3
  # https://hub.docker.com/r/phpmyadmin/phpmyadmin
  # This one is optional
  phpmyadmin:
    # List of dependencies
    depends_on:
      - db
    # Image name (optinally version)
    # https://docs.docker.com/compose/compose-file/#image
    image: phpmyadmin/phpmyadmin
    # Define restart policy
    # https://docs.docker.com/compose/compose-file/#restart
    restart: always
    # Ports mapping
    ports:
      - 8080:80
    # Add environment variables
    # https://docs.docker.com/compose/compose-file/#environment
    environment:
      PMA_HOST: db
      MYSQL_ROOT_PASSWORD: password
    # List of networks to join
    networks:
      - wp

# Top building block that defines
# All networks used for this service
networks:
  wp:

# Top building block that defines
# All volumes used for this service
volumes:
  db_data: