Hosting Docker Internal in Linux
Docker allows developers to efficiently build, test, and deploy applications by packaging them in standardized units called containers. When working with Docker containers, you may encounter scenarios where you need to connect a container to a host machine.
Linux equivalent to the host.docker.internal command
Docker versions before 18.03 only support the command on Mac and Windows systems host.docker.internal. However, in December 2020, Docker released version 20.10.0, and subsequent versions support using the host.docker.internal command to connect to the host on Linux machines.
According to the Docker documentation, if the host's IP address keeps changing, we can host.docker.internalconnect to the host using , which resolves to the host's internal IP address. However, this should only be used in a development environment.
In Windows and Mac, host.docker.internalit is much easier to connect to the host using . Let's say we want to connect to the MySQL service running on the default port 3606 on the host.
We can use the following command to let the Docker container connect to this service.
Code:
host.docker.internal:3306
On Linux systems, on the other hand, we need to add an extra flag to successfully connect to the host. This is done by docker runadding the --add-host flag next to the command. This only works with Docker versions after 20.10.0.
Code:
$ docker run -d --add-host host.docker.internal:host-gateway new_container
This command adds a new entry to the etc/hosts directory, host.docker.internalmapping to the host gateway. Alternatively, we could have used 172.17.0.1, also known as localhost, which is the gateway address for the default bridge network in Docker.
Docker networking is a broad topic and the commands or methods above can be used in different ways depending on what you want to accomplish.
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