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.

⏮️ Previous
Next ⏭️