What is linux equivalent of "host.docker.internal"

Depends what you're trying to do. If you're running with --net=host, localhost should work fine. If you're using default networking, use the static IP 172.17.0.1. I suspect neither will behave quite the same as those domains.

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: https://stackoverflow.com/a/61424570/3757139

See also this answer below to add to a docker-compose file - https://stackoverflow.com/a/67158212/243392

If you are using Docker Compose + Linux, you have to add it manually (at least for now). Use extra_hosts on your docker-compose.yaml file:

version: '3.7'

services:

  fpm:
    build:
      context: .
    extra_hosts:
      - "host.docker.internal:host-gateway"

Docs - https://docs.docker.com/compose/compose-file/compose-file-v3/#extra_hosts

Do not forget to update Docker since this only works with Docker v20.10+.

Source : https://github.com/docker/for-linux/issues/264#issuecomment-784985736

What is linux equivalent of "host.docker.internal"

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