How Can I Connect My Local MongoDB Database to a Go Application Running in a Docker Container?

Connecting Local MongoDB Database to Docker

In the realm of software development, it's common to encounter the challenge of integrating local services with Docker containers. In this specific case, you're facing an issue connecting your MongoDB database, which runs locally, to your Go application running within a Docker container.

The issue lies in the Docker environment's isolation. When you run your application within Docker, it operates in a virtual environment with its own network configuration. This means that your local MongoDB database is not directly accessible from the container's network.

To resolve this, Docker provides a special IP address, host.docker.internal, which maps to the host machine's IP address within the container's network. By using this IP address in your MongoDB connection string, you can bridge the communication gap between the container and the local database.

Here's the modified connection string that will address the "CreateSession: no reachable servers" error:

mongodb://host.docker.internal:27017/database

By using host.docker.internal as the hostname, your application will be able to establish a connection to your local MongoDB database even when running within the Docker container.

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