How can Docker access the host machine’s database?

To allow a Docker container to access the host machine’s database, you can utilize Docker’s networking feature.

Here is an example of using Docker to connect to a host machine’s database.

1. Set up a custom Docker network.

docker network create mynetwork

1. Run the database container and connect it to a custom network.

docker run -d --name mydb --network mynetwork -e MYSQL_ROOT_PASSWORD=password mysql

This will create a MySQL container named mydb and connect it to the mynetwork network.

1. The container needs to access the database and connect it to the same network in order to run.

docker run -it --name myapp --network mynetwork myappimage

This will create an application container named myapp and connect it to the mynetwork network.

1. In a containerized application, you can access the database using the host machine’s IP address and the database container’s port. For example, in the application’s configuration file, you can set the database host to the host machine’s IP address and the port to the database container’s port.

Please note that the IP address of the host machine may change due to different network environments. Use the following command to find the host machine’s IP address:

docker network inspect bridge

The IP address of the host machine can be found in the output results.

This way, the application container can access the host machine’s database through Docker networking. Make sure the host machine’s firewall settings allow access to the corresponding database port from the Docker network.