Docker Wordpress not connecting with docker Mysql Compose - mysql

Question

I am trying to set up multiple WordPress sites being hosting on the same server using docker using nginx reverse proxy server. I have a network setup with the nginx proxy listening on port 80 called nginx-proxy. I confirmed they are all on the same docker network. However, I am still getting WordPress is unable to communicate with the database. I can confirm that the credentials are correct and that MySQL is running on the other docker container.
With my testing, the forwarding proxy is working if I update the virtual host and open it in the web browser it does open the error message on that page. I can ping both the containers from within their shell. I am not sure what I am doing wrong I am newer to dockers networking within version 3. I don't believe docker has differenced between platforms, but in case it does I am running it on Mac OS.
I know there are other posts similar to this using Link and version 2 however, I was not able to find a version 3 with information that fixed my issue.
version: "3.3"
services:
db_node_domain:
image: mysql:5.7
volumes:
- db_data:/var/lib/mysql
restart: always
environment:
MYSQL_ROOT_PASSWORD: PASSWORD
MYSQL_DATABASE: wordpress
MYSQL_USER: wordpress
MYSQL_PASSWORD: PASSWORD
container_name: wordpress_db
wordpress:
depends_on:
- db_node_domain
image: wordpress:latest
expose:
- 80
restart: always
environment:
VIRTUAL_HOST: domain.com
WORDPRESS_DB_HOST: db_node_domain:3306
WORDPRESS_DB_USER: wordpress
WORDPRESS_DB_PASSWORD: PASSWORD
container_name: wordpress
volumes:
db_data: {}
networks:
default:
external:
name: nginx-proxy
Please let me know if any more information is required. Thank you for any assistance you might be able to provide.

Answer 1

I don't see any problem with your docker-compose file, also it's working on my local machine which is macOS.
One thing, 'wordpress' container will fail to bring up several times with MySQL Connection Error: (2002) Connection refused on the first bootup due to MySQL initialization. It should connect to 'wordpress_db' after a few retrials.
If it doesn't connect even after retrials, can you attach logs of 'wordpress' container?

Answer 2

You can use this as your docker compose file below.
Reference:
https://github.com/docker/awesome-compose/tree/master/wordpress-mysql
version: '3.7'
services:
db:
image: mysql:8.0.19
command: '--default-authentication-plugin=mysql_native_password'
restart: always
volumes:
- db_data:/var/lib/mysql
restart: always
environment:
- MYSQL_ROOT_PASSWORD=somewordpress
- MYSQL_DATABASE=wordpress
- MYSQL_USER=wordpress
- MYSQL_PASSWORD=wordpress
wordpress:
image: wordpress:latest
ports:
- 80:80
restart: always
environment:
- WORDPRESS_DB_HOST=db
- WORDPRESS_DB_USER=wordpress
- WORDPRESS_DB_PASSWORD=wordpress
- WORDPRESS_DB_NAME=wordpress
volumes:
db_data:

Answer 3

I have isolated the issue. It was the first time I was playing the docker volumes. I forgot to clear out the volumes when I updated the database information. So I was connecting to the old database with the new information which was leading to the error (This is why your don't try to learn something new late into the night on little sleep). Once I removed the volumes recomposed the docker containers it works perfectly.
Thank you for every one who assisted me with this.