Multiple WordPress sites with one shared DB using Docker : <p>I want to run multiple WordPress websites with one shared database using docker.</p>

<p>Is it possible to specify a database and set an appropriate volume to a certain sql file to initialize WordPress for each container in its <code>docker-compose.yml</code> file?</p>

<hr>

<p>For example, I have three <code>docker-compose.yml</code> files for a shared container, siteA and siteB.</p>

<p>When I run <code>docker-compose up</code> in <code>./shared</code>, two DBs will be created for the two sites (example_a and example_b).</p>

<p>And when I run <code>docker-compose up</code> in <code>./siteA</code>, I want to change current DB to <code>example_a</code>, and initialize the site with a certain amount of data by sql volumed from <code>./siteA/mysql/setup.sql</code>.</p>

<p>Same thing goes with siteB.</p>

<p>I know I can specify a database and volume like <code>-
 WORDPRESS_DB_NAME: example_a</code> and <code>- ./db-data/mysql.dump.sql:/docker-entrypoint-initdb.d/install_wordpress.sql</code> in mysql section in <code>docker-compose.yml</code> but I only have one shared mysql and cannot specify DB and volume for each site.</p>

<hr>

<p>I have multiple <code>docker-compose.yml</code> files look something like below.</p>

<p><strong>./shared/docker-compose.yml</strong></p>

<pre><code>version: "2"

services:

  proxy:
    image: jwilder/nginx-proxy
    privileged: true
    container_name: proxy
    ports:
      - 80:80
      - 443:443
    volumes:
      - /var/run/docker.sock:/tmp/docker.sock:ro
      - ./certs:/etc/nginx/certs:ro
    restart: always
    logging:
      options:
        max-size: 5m
        max-file: "10"

  mysql:
    image: mysql:5.7
    container_name: mysql
    command: &gt;
      --character-set-server=utf8mb4
      --collation-server=utf8mb4_general_ci
      --max-allowed-packet=128M
    ports:
      - "3306:3306"
    environment:
      - MYSQL_ROOT_PASSWORD=foobar
    restart: always
    volumes:
      - db-data:/var/lib/mysql
      - ./mysql/sql-setup.sql:/docker-entrypoint-initdb.d/sql-setup.sql # to create multiple databases (e.g. example_a, example_b)
    logging:
      options:
        max-size: 5m
        max-file: "10"

volumes:
  db-data:
    driver: local

networks:
  default:
    external:
      name: shared
</code></pre>

<p><strong>./siteA/docker-compose.yml</strong></p>

<pre><code>version: "2"

services:
  example_a_wordpress:
    image: wordpress
    container_name: a.example
    environment:
      WORDPRESS_DB_NAME=example_a
      WORDPRESS_DB_PASSWORD=foobar
      VIRTUAL_HOST: a.example.dev
    external_links:
      - mysql
    restart: always
    volumes:
      - ./dist/theme:/var/www/html/wp-content/themes/main
      - ./dist/assets:/var/www/html/assets
    logging:
      options:
        max-size: 5m
        max-file: "10"

networks:
  default:
    external:
      name: shared
</code></pre>

<p><strong>./siteB/docker-compose.yml</strong></p>

<pre><code>version: "2"

services:
  example_b_wordpress:
    image: wordpress
    container_name: b.example
    environment:
    WORDPRESS_DB_NAME=example_b
    WORDPRESS_DB_PASSWORD=foobar
      VIRTUAL_HOST: b.example.dev
    external_links:
      - mysql
    restart: always
    volumes:
      - ./dist/theme:/var/www/html/wp-content/themes/main
      - ./dist/assets:/var/www/html/assets
    logging:
      options:
        max-size: 5m
        max-file: "10"

networks:
  default:
    external:
      name: shared
</code></pre>
