Dependencies

• Configuration Refinement (Dependencies)

  • Add the definition of dependency and startup order for each container in the docker-compose.yml file as applied below:

  version: "3.8"
  
  services:
    nginx:
      build: requirements/nginx/.
      container_name: nginx
      restart: on-failure
      depends_on:
        - wordpress
      networks:
        - inception
      ports:
        - "443:443"
      volumes:
        - .web:/var/www/html
    wordpress:
      build: requirements/wordpress/.
      container_name: wordpress
      restart: on-failure
      depends_on:
        - mariadb
      networks:
        - inception
      expose:
        - "9000"
      volumes:
        - .web:/var/www/html
    mariadb:
      build: requirements/mariadb/.
      container_name: mariadb
      restart: on-failure
      networks:
        - inception
      expose:
        - "3306"
  networks:
    inception:
      driver: bridge

  👉🏼 After defining dependencies, the container startup order will change. If no dependencies are declared, the order followed will always be the order written in the docker-compose.yml file.
  👉🏼 Dependencies:

  • nginx: Needs PHP-FPM to process .php requests. Since PHP-FPM is in the WordPress container, nginx will depend on WordPress starting first.
  • wordpress: Needs MariaDB to manage the database present in the DB volume. Since MariaDB is in the MariaDB container, WordPress will depend on MariaDB starting first.

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