Docker automatically changes port in URL

Question

I built two WordPress websites, one bound to port 9000 and one to 8000. They are both connected to the same MySQL database.

When I access the port 8000 it works perfectly and connects to both the website and the database.

On the other side, when I access the port 9000 it just automatically redirects me to the port 8000 and to its website. Any reason why this may happen?

This is the docker-compose file:

Tried to clear the cache and tried it on Firefox (default browser is Chrome) but it still happens.

version: '3.3'

services:
   db:
     image: mysql:5.7
     volumes:
       - db_data:/var/lib/mysql
     restart: always
     environment:
       MYSQL_ROOT_PASSWORD: somewordpress
       MYSQL_DATABASE: wordpress
       MYSQL_USER: wordpress
       MYSQL_PASSWORD: wordpress

   wordpress:
     depends_on:
       - db
     image: wordpress:latest
     ports:
       - "8000:80"
     restart: always
     environment:
       WORDPRESS_DB_HOST: db:3306
       WORDPRESS_DB_USER: wordpress
       WORDPRESS_DB_PASSWORD: wordpress
       WORDPRESS_DB_NAME: wordpress

   second_wordpress:
     depends_on:
       - db
     image: wordpress:latest
     ports:
       - "9000:80"
     restart: always
     environment:
       WORDPRESS_DB_HOST: db:3306
       WORDPRESS_DB_USER: wordpress
       WORDPRESS_DB_PASSWORD: wordpress
       WORDPRESS_DB_NAME: wordpress

volumes:
    db_data: {}

user_3924803 · Answer

Go to http://localhost:9000/wp-admin/install.php to install your second instance.

Be aware that the configuration is stored in files (in /var/www/html/) inside the container and will be lost when you stop the container. So you'll have to install it again when you restart.

If you want to save the configuration, you can create a volume and map it to /var/www/html using something like this

   wordpress:
     depends_on:
       - db
     image: wordpress:latest
     ports:
       - "8000:80"
     restart: always
     environment:
       WORDPRESS_DB_HOST: db:3306
       WORDPRESS_DB_USER: wordpress
       WORDPRESS_DB_PASSWORD: wordpress
       WORDPRESS_DB_NAME: wordpress
     volumes:
       - wordpress:/var/www/html

and

volumes:
  wordpress:

user_14208116 · Answer

The problem was that both sites used the same DATABASE inside mySQL, the solution was to create different databases in mySQL and assign each website to it.

Then the wordpress sites will take the info from different databases and not route.

Docker automatically changes port in URL

2 Answers