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What is the Linux equivalent of "host.docker.internal"?

On Mac and Windows, it is possible to use host.docker.internal (Docker 18.03+) inside a container.

Is there one for Linux that will work out of the box without passing environment variables or extracting it using various CLI commands?

Solution

  • For Linux systems, you can – starting from major version 20.04 of the Docker engine – now also communicate with the host via host.docker.internal. This won't work automatically, but you need to provide the following run flag:

    --add-host=host.docker.internal:host-gateway

    See the answer here: How to access host port from docker container

    See also this answer below to add to a docker-compose file - What is the Linux equivalent of "host.docker.internal"?