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Docker

Docker is used to manage containers, which are isolated virtual environments for running software stacks.

Install​

Install Docker Engine by following the install instructions.

For Windows and macOS, you can install Docker Desktop (GUI app) which includes the engine; or choose a more technical way to install the engine by itself.

There are other container solutions, such as Podman and Apple's Container.

Commands​

Start the containers.

docker compose up -d

Visit the site at http://localhost:3000. Change the default port number 3000 in the config file to run multiple applications.

Stop the containers.

docker compose down

List running processes.

docker compose ps

Example configurations​

WordPress site​

Example config file docker-compose.yml for a WordPress site with MariaDB and WP-CLI. It uses a named volume mysql for persistent storage of database.

services:
  mysql:
    image: mariadb:11.4
    environment:
      MYSQL_ROOT_HOST: '%'
      MYSQL_ROOT_PASSWORD: password
      MYSQL_DATABASE: wordpress
    restart: always
    volumes:
      - 'mysql:/var/lib/mysql'
    deploy:
      resources:
        limits:
          cpus: '0.5'
          memory: 512M
  wordpress:
    depends_on:
      - mysql
    image: wordpress:php8.0
    ports:
      - '3000:80'
    environment:
      WORDPRESS_DB_USER: root
      WORDPRESS_DB_PASSWORD: password
      WORDPRESS_DB_NAME: wordpress
    volumes: &ref_0
      - .:/var/www/html
    restart: always
    deploy:
      resources:
        limits:
          cpus: '0.5'
          memory: 512M
  cli:
    depends_on:
      - wordpress
    image: wordpress:cli-php8.0
    volumes: *ref_0
    user: '33:33'
    environment:
      WORDPRESS_DB_USER: root
      WORDPRESS_DB_PASSWORD: password
      WORDPRESS_DB_NAME: wordpress
volumes:
  mysql: {}