What is the reason for the "connection refused" error when attempting to connect to mysql through docker-compose?

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There could be several reasons for the "connection refused" error when attempting to connect to MySQL through Docker Compose, including:

1. Docker container is not running: Make sure that the container is running by using the docker ps command.

2. Incorrect port number: Double-check that you are connecting to the correct port number that the MySQL container is listening on. By default, the MySQL container listens on port 3306.

3. Incorrect credentials: Check that you are using the correct credentials to access the MySQL database. By default, the root user has no password, but you can set one up when launching the MySQL container.

4. Firewall or network issues: Make sure that there are no firewall or network issues preventing the connection to the MySQL container.

5. Docker-compose environment settings: Ensure that the environment setting in your docker-compose.yml file matches the values your application expects. Ensure that your application is correctly directing traffic to the Compose service network.

These reasons should help you identify why you can’t connect to the MySQL database in Docker Compose.