Docker Compose Wordpress+mysql - Alternative ports - wordpress

Question

mysql by default listens to ports 3306 and 33060.
since im launching multiple instances, i have to provide alternative ports.
i managed to map the first one <DB_HOST: 8002> to <3306> but i cannot find any documentation for the second wordpress parameter name, i just found DB_HOST.
do you know how i can also map the second port?
version: "3.9"
services:
db:
image: mysql:latest
volumes:
- wordpress_db_data:/var/lib/mysql
ports:
- "8002:3306"
- "8003:33060"
restart: unless-stopped
environment:
MYSQL_ROOT_PASSWORD: wordpress
MYSQL_DATABASE: wordpress
MYSQL_USER: wordpress
MYSQL_PASSWORD: wordpress
wordpress:
depends_on:
- db
image: wordpress:latest
volumes:
- wordpress_data:/var/www/html
ports:
- "80:80"
restart: unless-stopped
environment:
DB_HOST: 8002
WORDPRESS_DB_HOST: db
WORDPRESS_DB_USER: wordpress
WORDPRESS_DB_PASSWORD: wordpress
WORDPRESS_DB_NAME: wordpress
volumes:
wordpress_db_data: {}
wordpress_data: {}

Answer 1

On the bridge network that docker-compose creates, you use the container ports directly. You only use the mapped ports when you connect to a container from the host computer.
Since WordPress and MySQL are on the same network, you should use port 3306. You only need to map the MySQL ports to host ports if you intend to connect to the database from the host.
Also, WordPress doesn't connect to MySQL using port 33060, so that's why there's no parameter for it on the WordPress side.
Here's a docker-compose file that should work
version: "3.9"
services:
db:
image: mysql:latest
volumes:
- wordpress_db_data:/var/lib/mysql
restart: unless-stopped
environment:
MYSQL_ROOT_PASSWORD: wordpress
MYSQL_DATABASE: wordpress
MYSQL_USER: wordpress
MYSQL_PASSWORD: wordpress
wordpress:
depends_on:
- db
image: wordpress:latest
volumes:
- wordpress_data:/var/www/html
ports:
- "80:80"
restart: unless-stopped
environment:
WORDPRESS_DB_HOST: db
WORDPRESS_DB_USER: wordpress
WORDPRESS_DB_PASSWORD: wordpress
WORDPRESS_DB_NAME: wordpress
volumes:
wordpress_db_data: {}
wordpress_data: {}
Note that I've removed the port mappings on the database, since they're not needed for WordPress to work. If you need to connect to the database from the host, you can just add them back. Usually port 3306 is enough. 33060 is rarely used, AFAIK.