Connection Timeout Troubleshooting

adminer:
image: adminer
container_name: lift-adminer
restart: always
ports:
– '1255:8080'
depends_on:
– db
adminer/phpmyadmin connection time out

1. **Check Database Connection Settings**: Ensure that your Adminer and phpMyAdmin services are correctly configured to connect to the MySQL database. In your `docker-compose.yml`, both services should have the correct environment variables set for the database connection. Here's what to verify:

– For **phpMyAdmin**:

environment:
       PMA_HOST: db
       PMA_PORT: 3306
       MYSQL_ROOT_PASSWORD: "${DB_PASSWORD}"

– For **Adminer**:
Adminer defaults to connecting to `db` (your MySQL service). Ensure you can connect using the same credentials as provided in the `db` service.

2. **Networking Issues**: Ensure that the containers are running on the same network. By default, Docker Compose creates a network for your services. You can check the network using:

docker network ls

Ensure that all your services are on the same network.

3. **Container Status**: Check if all your containers are running correctly:

docker-compose ps

Look for any errors in the `db` container logs:

docker logs mysql_db

4. **Environment Variables**: Ensure your environment variables (`DB_PASSWORD`, `DB_USER`, etc.) are set correctly in your `.env` file. You can also try hardcoding these values directly into your `docker-compose.yml` for debugging purposes.

5. **Firewall and Port Mapping**: If you are using specific IPs in your `docker-compose.yml` (like `${IP}`), ensure that those ports are not blocked by a firewall on your host machine. You may also want to try using `127.0.0.1` instead of `${IP}` to see if it resolves the issue.

6. **Adminer Configuration**: Adminer should normally connect to the database server automatically, but you can also try to explicitly specify the server in the Adminer URL when accessing it in the browser:

http://localhost:1255/?server=db

7. **Restart Services**: If you've made changes to the configuration, restart the services:

docker-compose down
   docker-compose up -d

8. **Logs for Adminer and phpMyAdmin**: Check the logs for Adminer and phpMyAdmin to see if there are any specific error messages:

docker logs lift-adminer
   docker-compose logs pma

If you've gone through these steps and are still facing issues, please provide any error messages from the logs or additional context, and I can help you further troubleshoot the problem.

1. **MySQL Authentication Plugin**: MySQL 8 uses `caching_sha2_password` as the default authentication plugin. If your Adminer or phpMyAdmin is not configured to handle this authentication method, it may result in connection issues. You can change the authentication method for the MySQL user in your `docker-compose.yml` by adding the following line under the `db` service:

environment:
     MYSQL_ROOT_PASSWORD: "${DB_PASSWORD}"
     MYSQL_USER: "${DB_USER}"
     MYSQL_PASSWORD: "${DB_PASSWORD}"
     MYSQL_DATABASE: your_database_name
     MYSQL_INITDB_SKIP_TZINFO: "true"  # Optional, if you want to skip timezone info
     MYSQL_ALLOW_EMPTY_PASSWORD: "true"  # Only for testing, not recommended in production
   command:
     --default-authentication-plugin=mysql_native_password

2. **Database Initialization**: If your Adminer or phpMyAdmin needs access to a specific database right away, ensure that it is created during initialization. You can specify a database name using `MYSQL_DATABASE` as shown above.

3. **Compatibility with phpMyAdmin and Adminer**: Ensure you are using versions of phpMyAdmin and Adminer that are compatible with MySQL 8. If you are using an older version of these tools, consider updating them to the latest versions that support MySQL 8.

4. **Connection URL**: When accessing Adminer or phpMyAdmin, make sure you are using the correct connection settings. In Adminer, you can specify the server (e.g., `db`), username, and password directly in the interface. For phpMyAdmin, you should be able to log in with the root user or the specified user.

5. **Check for Existing Connections**: Sometimes, there may be issues with existing connections or sessions. If you can access the MySQL shell, try running:

SHOW PROCESSLIST;

to see if there are any hanging connections.

6. **Inspect Logs for Errors**: Review the logs for MySQL, Adminer, and phpMyAdmin to see if there are any specific error messages. This can provide clues about what's going wrong:

docker logs mysql_db
   docker logs lift-adminer
   docker-compose logs pma

7. **Networking**: Ensure that the networking between containers is properly set up. You can test connectivity from one container to another. For example, exec into the Adminer container and try to ping the MySQL container:

docker exec -it lift-adminer /bin/sh
   ping db

After making adjustments, be sure to restart your Docker containers to apply any changes. If you're still facing issues, feel free to share any specific error messages or behaviors you're observing.

### 1. **Simplify Your Configuration**
First, let’s simplify the `docker-compose.yml` file to eliminate any potential configuration issues. Here’s a minimal version focusing on MySQL, Adminer, and phpMyAdmin:

version: '3'
services:
  db:
    image: mysql:8
    container_name: mysql_db
    restart: always
    ports:
      - '3306:3306'
    environment:
      MYSQL_ROOT_PASSWORD: "${DB_PASSWORD}"
      MYSQL_DATABASE: your_database_name  # Optional, create a database at startup
      MYSQL_USER: "${DB_USER}"
      MYSQL_PASSWORD: "${DB_PASSWORD}"
    command:
      --default-authentication-plugin=mysql_native_password
    volumes:
      - ./db-data:/var/lib/mysql

  pma:
    image: phpmyadmin/phpmyadmin
    environment:
      PMA_HOST: db
      PMA_PORT: 3306
      MYSQL_ROOT_PASSWORD: "${DB_PASSWORD}"
    depends_on:
      - db
    ports:
      - '8080:80'  # Change to a port not in use, like 8080

  adminer:
    image: adminer
    container_name: lift-adminer
    restart: always
    ports:
      - '1255:8080'
    depends_on:
      - db

### 2. **Start the Containers**
Run the following commands to build and start your containers:

docker-compose down
docker-compose up --build

### 3. **Check Container Status**
Ensure all containers are running:

docker-compose ps

### 4. **Access the Services**
– **Adminer**: Access Adminer at `http://localhost:1255`.
– **phpMyAdmin**: Access phpMyAdmin at `http://localhost:8080`.

### 5. **Test Database Connectivity from Adminer**
Once you access Adminer:
– For **Server**, use `db`.
– For **Username**, use the value of `${DB_USER}`.
– For **Password**, use the value of `${DB_PASSWORD}`.

### 6. **Inspect the Logs**
If you still face a timeout:
– Check the MySQL logs for errors:

docker logs mysql_db

– Check phpMyAdmin logs:

docker-compose logs pma

– Check Adminer logs:

docker logs lift-adminer

### 7. **Verify MySQL User Privileges**
If you can access the MySQL container, verify the user privileges:

docker exec -it mysql_db mysql -u root -p"${DB_PASSWORD}"

Then run:

SELECT User, Host FROM mysql.user;
SHOW GRANTS FOR '${DB_USER}'@'%';

Make sure your user is created correctly with appropriate permissions.

### 8. **Firewall/Network Issues**
If you still encounter timeouts:
– Ensure there are no firewall rules blocking access to the MySQL port (3306).
– You may also check if the Docker network is functioning correctly by running a command inside another container to ping the MySQL service:

docker exec -it lift-adminer ping db

### 9. **Connection from MySQL Shell**
You can also test MySQL connectivity by using the following command:

docker exec -it mysql_db mysql -u ${DB_USER} -p"${DB_PASSWORD}"

If this fails, it indicates a problem with the database configuration.

### 10. **Try Different Ports**
If there's still an issue, try running your services on different ports (especially if something is conflicting) or without specific IP bindings to ensure it's not an IP resolution issue.

If you've tried all these steps and are still facing connection timeouts, please share any specific error messages or behaviors you're observing from the logs.