Adminer Docker Connection Timeout

1. **Check Container Status**: Ensure that both your Adminer and database containers are running. You can check the status with:

docker ps

2. **Network Configuration**: Ensure that Adminer can communicate with your database container. If your containers are in the same Docker network, Adminer should be able to connect using the service name of the database container.

3. **Use Correct Database Host**: In Adminer, when prompted for the database server, use the name of your database service defined in your `docker-compose.yml` file, not `localhost`. For example:

db (if your service is named 'db')

4. **Check Port Configuration**: Ensure that the ports are correctly mapped in your `docker-compose.yml` file. Adminer typically uses port `8080`. Make sure you are accessing it at the correct port:

http://localhost:8080

5. **Database Credentials**: Verify that you are using the correct username and password to connect to your database. Check the credentials defined in your `docker-compose.yml` or `.env` file.

6. **Firewall or Security Groups**: If you're running Docker on a cloud provider (like AWS EC2), ensure that your security group settings allow inbound traffic on the port you are using for Adminer and your database.

7. **Inspect Logs**: Check the logs for both Adminer and your database container for any error messages that could indicate what’s going wrong:

docker logs <container_name>

8. **Health Checks**: If your database container has health checks defined, ensure that it is healthy before trying to connect with Adminer.

9. **Docker Compose Example**: Here’s a simple example of a `docker-compose.yml` setup with Adminer and MySQL:

version: '3.8'
   services:
     db:
       image: mysql:8
       environment:
         MYSQL_ROOT_PASSWORD: root
         MYSQL_DATABASE: mydatabase
         MYSQL_USER: user
         MYSQL_PASSWORD: password
       ports:
         - "3306:3306"

     adminer:
       image: adminer
       ports:
         - "8080:8080"
       depends_on:
         - db

If you follow these steps and still experience issues, feel free to share your `docker-compose.yml` file, and I can help you further troubleshoot the setup.

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

### 1. **Database Host Configuration in Adminer**
In your Adminer configuration, ensure you're connecting to the correct host. In your setup, you should use `db` as the database server name since that's the service name in your `docker-compose.yml`.

### 2. **Ensure MySQL Environment Variables are Set Correctly**
Make sure the environment variables `${DB_PASSWORD}` and `${DB_USER}` are set correctly in your `.env` file or your environment. If they are not defined, Adminer won't be able to connect to the MySQL database.

### 3. **Check Adminer URL**
You should access Adminer through `http://localhost:1255` in your browser, as you mapped it to port `1255`.

### 4. **Container Dependencies**
The `depends_on` directive ensures that Adminer starts after the `db` container, but it does not wait for MySQL to be fully ready. You might still face timeouts if the MySQL service isn't ready yet when Adminer tries to connect.

### 5. **Increase Connection Timeout**
You might want to configure a longer timeout for Adminer. You can do this by setting the following environment variable in your Adminer service:

environment:
      ADMINER_TIMEOUT: 300 # in seconds

### 6. **Database Connection from Adminer**
When accessing Adminer, make sure to enter the following details:
– **Server**: `db`
– **Username**: Your database username (check your `.env` or the `docker-compose.yml` for `${DB_USER}`)
– **Password**: Your database password (check your `.env` or the `docker-compose.yml` for `${DB_PASSWORD}`)
– **Database**: You can leave this empty to see all databases or specify one if you want.

### 7. **Check MySQL Logs**
If you're still having issues, check the logs for your MySQL container for any errors:

docker logs mysql_db

### 8. **Access PHPMyAdmin**
You also have PHPMyAdmin (`pma`) configured. If Adminer is giving you issues, you can try accessing your MySQL database through PHPMyAdmin using the same database credentials.

### 9. **Use Docker Network**
Consider using Docker's default bridge network or creating a custom network if you're facing network isolation issues. To create a custom network, add the following at the bottom of your `docker-compose.yml`:

networks:
  my_network:
    driver: bridge

Then attach all services to this network:

services:
  php:
    networks:
      - my_network
  db:
    networks:
      - my_network
  pma:
    networks:
      - my_network
  adminer:
    networks:
      - my_network

### Example of Adjusted Docker Compose
Here's an adjusted version of your `docker-compose.yml` with the timeout setting and network configuration:

version: '3'
services:
  php:
    build:
      context: .
      dockerfile: Dockerfile
    volumes:
      - ./src:/var/www/html
    ports:
      - ${IP}:${PORT}:80
    depends_on:
      - db
    links:
      - db
    networks:
      - my_network

  db:
    image: mysql:latest
    container_name: mysql_db
    restart: always
    ports:
      - ${IP}:3306:3306
    environment:
      MYSQL_ROOT_PASSWORD: "${DB_PASSWORD}"
      MYSQL_USER: "${DB_USER}"
      MYSQL_PASSWORD: "${DB_PASSWORD}" # Change MYSQL_PASS to MYSQL_PASSWORD
    volumes:
      - ./db-data:/var/lib/mysql
    command:
      --sql_mode=STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION
    networks:
      - my_network

  pma:
    image: phpmyadmin/phpmyadmin
    environment:
      PMA_HOST: db
      PMA_PORT: 3306
      MYSQL_ROOT_PASSWORD: "${DB_PASSWORD}"
      UPLOAD_LIMIT: 50M
    depends_on:
      - db
    ports:
      - ${IP}:${PHPMYADMIN_PORT}:80
    links:
      - db:db
    networks:
      - my_network
  
  adminer:
    image: adminer
    container_name: lift-adminer
    restart: always
    ports:
      - '1255:8080'
    depends_on:
      - db
    environment:
      ADMINER_TIMEOUT: 300
    networks:
      - my_network

networks:
  my_network:
    driver: bridge

### Final Steps
After making changes, ensure to rebuild your containers with:

docker-compose down
docker-compose up --build

Check the Adminer connection after that. If issues persist, let me know what errors you see in the logs or on the Adminer interface, and I can help further!

### 1. **Verify Network Configuration**
Make sure that all your services are correctly attached to the same network. You can check this by running:

docker network ls

Then inspect the network:

docker network inspect <network_name>

Ensure that all your services (php, db, pma, adminer) are listed under the same network.

### 2. **Test Database Connectivity**
To further diagnose the issue, you can manually test the database connectivity from within the Adminer container. Use the following command to enter the Adminer container's shell:

docker exec -it lift-adminer /bin/sh

Once inside the container, you can use a tool like `ping` or `mysql` (if installed) to check connectivity:

ping db

Or if `mysql` client is installed:

mysql -h db -u <username> -p

Replace “ with your MySQL username. This will prompt for a password.

### 3. **Check MySQL Logs Again**
Examine the logs of your MySQL container for any signs of errors or issues that might explain why connections are timing out:

docker logs mysql_db

### 4. **Increase MySQL Timeout**
Sometimes, MySQL itself might be timing out. You can try increasing the wait timeout in the `db` service by adding the following to your environment variables:

environment:
      MYSQL_ROOT_PASSWORD: "${DB_PASSWORD}"
      MYSQL_USER: "${DB_USER}"
      MYSQL_PASSWORD: "${DB_PASSWORD}"
      MYSQL_ROOT_HOST: '%'
      MYSQL_ALLOW_EMPTY_PASSWORD: 'yes'  # Optional for testing purposes
      MYSQL_INITDB_SKIP_TZDATA: 'yes'    # Optional
      MYSQL_WAIT_TIMEOUT: 28800            # Set to 8 hours

### 5. **Remove and Rebuild Containers**
Sometimes the simplest solution is to ensure there are no lingering issues with previous builds. Remove all containers and images and rebuild:

docker-compose down --volumes
docker-compose up --build

### 6. **Firewall and Security Groups**
If you're running Docker in a cloud environment (e.g., AWS), check your security group settings to ensure that your EC2 instance allows inbound connections on the relevant ports (3306 for MySQL and 1255 for Adminer).

### 7. **Check Adminer Environment Variables**
Make sure you are setting the correct `MYSQL_ROOT_PASSWORD` in Adminer. Double-check your environment variables and ensure they match what's set in your MySQL configuration.

### 8. **Use Container Names Directly**
If you're still having trouble with the service name, try specifying the MySQL connection directly using the container name in Adminer:
– Server: `mysql_db`
– Username: Your MySQL username
– Password: Your MySQL password

### 9. **Check Host Machine Resources**
Sometimes connection timeouts can be related to resource constraints on your host machine. Ensure that you have enough CPU and memory allocated for your Docker containers.

### 10. **Docker Compose Version**
Make sure you're using a recent version of Docker Compose. You can check your version with:

docker-compose --version

Updating to the latest version might resolve potential bugs.

If you've gone through all these steps and are still facing issues, please provide the output from any logs or error messages you see in Adminer or MySQL, and I can help you further diagnose the problem.