How to reach localhost on host from docker container?

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    extra_hosts:
      - "host.docker.internal:host-gateway"

would work as:

    extra_hosts:
      - "host.docker.internal:172.17.0.1"

This is neither a requirement, nor is it wrong to use extra_hosts to let the container inject this name resolution into the containers /etc/host. Or you just use the host’s hostname or ip.

If this is not working, replace 172.17.0.1 (ip of docker0) with 172.18.0.1 (ip of docker_gwbridge).

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