Docker WordPress install

docker-compose.yml

# Create a local WordPress environment using Docker containers.

version: '3.8' 

services: # Define each service.
  wp_db: # Name of the service (MariaDB server to provide MySQL for a WordPress site).
    container_name: wp_db # Give a name to the container.
    image: mariadb:latest # The image that will be pulled and run as a container.
    volumes: # Create storage on host machine for /var/lib/mysql.
      - ./mysql:/var/lib/mysql # <host_filepath>:<container_filepath>
    restart: unless-stopped # Container will always restart.
    environment: # Pass environment variables to the MariaDB. 
      MYSQL_ROOT_PASSWORD: wordpress # The password for root.
      MYSQL_DATABASE: wordpress # Create a database named wordpress.
      MYSQL_USER: wordpress # Create user, wordpress, with access to that database.
      MYSQL_PASSWORD: wordpress # Set password for user wordpress.
    networks: # Connects the container to an internal Docker network.
    - wp_network # Name of the internal Docker network.

  wp: # Name of the service (WordPress container to provide an Apache web server and PHP).
    container_name: wp # Give a name to the container.
    depends_on: # Creates a dependency to other services.
      - wp_db # Name of the service that provides MySQL for a WordPress site.
    image: wordpress:latest # The image that will be pulled and run as a container.
    volumes: # Create storage on host machine for WordPress installation.
      - ./wordpress:/var/www/html # <host_filepath>:<container_filepath>
    restart: unless-stopped # Container will always restart.
    ports: # Expose ports on the container.
      - "8080:80" # Port-forwarding. <host_port>:<container_port>
    environment: # Pass environment variables about the database service to the WordPress installation’s wp-config.php file.
      WORDPRESS_DB_HOST: wp_db:3306 # The MySQL hostname value in wp-config.php. Connect to the wp_db container over port 3306.
      WORDPRESS_DB_USER: wordpress # Use the same value as the wp_db service’s MYSQL_USER.
      WORDPRESS_DB_PASSWORD: wordpress # Use the same value as the wp_db service’s MYSQL_PASSWORD.
      WORDPRESS_DB_NAME: wordpress # Use the same value as the wp_db service’s MYSQL_DATABASE.
    networks: # Makes the container available on an internal Docker network.
    - wp_network # Name of the internal Docker network.

  phpmyadmin: # Name of the service (phpMyAdmin container for working with WordPress databases).
    container_name: phpmyadmin # Give a name to the container providing phpMyAdmin.
    image: phpmyadmin/phpmyadmin:latest # Define the image that will be pulled and run as a container.
    depends_on: # Creates a dependency to other services.
      - wp_db # Name of the service that provides MySQL for a WordPress site.
    restart: unless-stopped # Container will always restart.
    ports: # Expose ports on the container.
      - 8181:80 # Port-forwarding. <host_port>:<container_port>
    environment:
      PMA_HOST: wp_db # The name of the database service.
      MYSQL_ROOT_PASSWORD: wordpress # The password for root.
    networks: # Makes the container available on an internal Docker network.
    - wp_network # Name of the internal Docker network.

networks: # Create an internal Docker network.
  wp_network: # Name of the internal Docker network.
    driver: bridge