How to Connect a Local MySQL Database to a Docker Container?

Connecting Local MySQL Database to Docker Container

In the realm of containerization, Docker has emerged as a powerful tool for isolating and managing applications. However, when deploying applications to production environments, a common challenge arises: how to connect to local databases from within Docker containers.

Problem:

You're running an application using Docker Compose and wish to connect to your local MySQL database without relying on the container's own database.

Docker Compose Configuration:

Your docker-compose.yml file includes services for both a web-app and an app-db container. The app-db container houses the MySQL database, but you seek an alternative solution to connect to your local MySQL instance.

Solution:

To bridge the gap between your local MySQL database and the Docker container, replace "localhost" with "host.docker.internal" in your connection string.

Additional Considerations:

For Linux systems, it's essential to start your Docker container with the "--add-host host.docker.internal:host-gateway" parameter to facilitate successful hostname resolution. This ensures that the container can access your local MySQL database.

Conclusion:

By utilizing "host.docker.internal" and the aforementioned Linux parameter, you can seamlessly connect your local MySQL database to your Docker container for efficient database access and enhanced application performance in production environments.

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