Laravel Database Connection Issue

Here are a few steps to troubleshoot and resolve this issue:

### 1. Verify `docker-compose.yml`
Make sure your `docker-compose.yml` has the correct service names and network configurations. Your MySQL service should be defined something like this:

version: '3.8'

services:
  app:
    image: php:8.3-apache
    # Other configurations...

  db:
    image: mysql:latest
    environment:
      MYSQL_ROOT_PASSWORD: your_password
      MYSQL_DATABASE: your_database
      MYSQL_USER: your_user
      MYSQL_PASSWORD: your_user_password
    networks:
      - your_network_name

networks:
  your_network_name:

### 2. Update `.env` File
In your Laravel `.env` file, make sure the database connection settings are correct. The host should match the service name defined in `docker-compose.yml`. For example:

DB_CONNECTION=mysql
DB_HOST=db
DB_PORT=3306
DB_DATABASE=your_database
DB_USERNAME=your_user
DB_PASSWORD=your_user_password

### 3. Restart Docker Containers
If you've made any changes to `docker-compose.yml` or the `.env` file, restart your Docker containers to apply those changes:

docker-compose down
docker-compose up -d

### 4. Check Network Configuration
Ensure that all your services are on the same Docker network. You can check the network by running:

docker network ls

To see which containers are connected to a specific network, use:

docker network inspect your_network_name

### 5. Test Database Connection
You can also try connecting to the MySQL container from the Laravel app container to see if the connection works. First, get into the Laravel container:

docker exec -it your_app_container_name bash

Then, use the MySQL client to test the connection:

mysql -h db -u your_user -p

### 6. Check for MySQL Service
Ensure the MySQL service is running properly. You can check the logs for the MySQL container to see if there are any issues:

docker-compose logs db

### 7. Use IP Address
As a last resort, if you cannot resolve the issue, you could try using the IP address of the MySQL container instead of the service name in your `.env` file. You can find the IP address by inspecting the container:

docker inspect -f '{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' your_db_container_name

Replace `DB_HOST` in your `.env` file with the IP address obtained from the above command.

After making these changes, restart your application and see if the issue persists. If you need further assistance, feel free to share your `docker-compose.yml` and any relevant configurations.