You can define environment variables inside docker-compose.yml file to be used in wp-config.php. You define them under the environment block and use them with getenv("")
1wordpress:
2 image: wp-img
3 restart: always
4 environment:
5 WORDPRESS_DB_HOST: mysql
6 WORDPRESS_DB_NAME: myawesomedb
7 WORDPRESS_DB_USER: myawesomeuser
8 WORDPRESS_DB_PASSWORD: oBw^^(&&ASJHGasb
9 DOMAIN_CURRENT_SITE: my.cooldomain.com
10 volumes:
11 - /home/blah/wordpress:/var/www/html
12 depends_on:
13 - mysql
1// wp-config.php
2
3/** The name of the database for WordPress */
4define('DB_NAME', getenv("WORDPRESS_DB_NAME"));
5
6/** MySQL database username */
7define('DB_USER', getenv("WORDPRESS_DB_USER"));
8
9/** MySQL database password */
10define('DB_PASSWORD', getenv("WORDPRESS_DB_PASSWORD"));
11
12/** MySQL hostname */
13define('DB_HOST', getenv("WORDPRESS_DB_HOST"));
You can also use a .env file and reference values from that inside your docker-compose.yml
1wordpress:
2 image: wordpress:5-fpm-alpine
3 depends_on:
4 - db
5 container_name: wordpress
6 restart: unless-stopped
7 # make sure to add path to env file
8 env_file: .env
9 # we refence .env variables like `$MYSQL_USER`
10 environment:
11 - WORDPRESS_DB_HOST=db:3306
12 - WORDPRESS_DB_USER=$MYSQL_USER
13 - WORDPRESS_DB_PASSWORD=$MYSQL_PASSWORD
14 - WORDPRESS_DB_NAME=wordpress