WP DB Connection Issue

services:
nginx:
image: nginx:latest
container_name: other7-nginx
ports:
– "5500:80"
networks:
– other-7app-network
volumes:
– ./nginx:/etc/nginx/conf.d
– ./applications/dndw-test:/var/www/dndw-test
depends_on:
– php

php:
build:
context: ./php
container_name: other-7php
volumes:
– ./applications/dndw-test:/var/www/dndw-test
expose:
– "9000"
working_dir: /var/www
networks:
– other-7app-network

ot7mysql2:
image: mysql:8.0
container_name: other-72mysql
environment:
MYSQL_ROOT_PASSWORD: rootpassword
MYSQL_DATABASE: site_db
MYSQL_USER: user
MYSQL_PASSWORD: userpassword
volumes:
– ./mysql/data:/var/lib/mysql
ports:
– "3308:3306"
networks:
– other-7app-network

adminer:
image: adminer
container_name: other-7adminer
restart: always
ports:
– '5501:8080'
networks:
– other-7app-network
depends_on:
– ot7mysql2

networks:
other-7app-network:
driver: bridge
This either means that the username and password information in your wp-config.php file is incorrect or we can’t contact the database server at ot7mysql2. This could mean your host’s database server is down.

### 1. **Check Database Credentials in `wp-config.php`**
Ensure that the database connection details in your `wp-config.php` file are correct. In particular, verify the following:

– **DB_NAME**: This should match `MYSQL_DATABASE` from the `ot7mysql2` service.
– **DB_USER**: This should match `MYSQL_USER` from the `ot7mysql2` service.
– **DB_PASSWORD**: This should match `MYSQL_PASSWORD` from the `ot7mysql2` service.
– **DB_HOST**: Since you're using Docker and the MySQL service is named `ot7mysql2`, it should be `ot7mysql2:3306`.

Example:

define( 'DB_NAME', 'site_db' );
define( 'DB_USER', 'user' );
define( 'DB_PASSWORD', 'userpassword' );
define( 'DB_HOST', 'ot7mysql2:3306' );

### 2. **Check MySQL Container Logs**
Run the following command to check if MySQL is properly running:

docker logs other-72mysql

Look for any errors or issues with the MySQL container.

### 3. **Check Container Network Connectivity**
Ensure that all containers are connected to the same network, which in this case is `other-7app-network`. You can check this by running:

docker network inspect other-7app-network

Make sure all the necessary containers (nginx, php, mysql) are listed in the `Containers` section.

### 4. **Check MySQL Service Availability**
From the WordPress container (or any other container in the same network), check if you can reach the MySQL service:

docker exec -it other-7php bash
ping ot7mysql2

If this fails, it might indicate network or container name issues.

### 5. **Rebuild and Restart Containers**
Sometimes, rebuilding the containers can resolve connectivity issues. Run the following:

docker-compose down
docker-compose up --build

This will rebuild the images and restart the containers. Afterward, check the status of the containers:

docker-compose ps

If the issue persists, double-check the network configuration and credentials to ensure everything matches.

This can be useful when you've removed or renamed services in your `docker-compose.yml` file, and you want to clean up any leftover containers from old configurations that are no longer needed.

For example, if you run:

docker-compose down --remove-orphans

It will:

– Stop and remove the containers defined in your `docker-compose.yml` file.
– Remove any orphaned containers (i.e., containers that were part of an earlier configuration but are no longer in the current `docker-compose.yml` file).

This can help ensure that your environment is clean and that you're not running unnecessary containers.

docker-compose up --build

This will:

1. Rebuild the Docker images based on the current `docker-compose.yml` configuration.
2. Start all the defined services (containers) again.

If you'd like to run it in detached mode (background), you can add the `-d` flag:

docker-compose up --build -d

This will ensure that your containers are rebuilt and restarted with the latest changes to your `docker-compose.yml` file. Once this is done, you can check the status of your containers with:

docker-compose ps

Let me know if you encounter any issues!