What is linux equivalent of “docker.for.mac.host.i

问题:

On Mac and Windows it is possible to use docker.for.mac.host.internal (replaces docker.for.mac.localhost) and docker.for.win.host.internal (replaces docker.for.win.localhost) host.docker.internal (Docker 18.03+) inside container.

Is there one for Linux that will work out of the box without passing env variables or extracting it using various cli commands.

回答1:

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.

回答2:

One solution is to use a special container which redirects traffic to the host. You can find such a container here: https://github.com/qoomon/docker-host. The idea is to grab the default route from within the container and install that as a NAT gateway for incoming connections.

Below an imaginary example usage:

docker-host:
  image: qoomon/docker-host
  cap_add: [ 'NET_ADMIN', 'NET_RAW' ]
  restart: on-failure
  environment:
    - PORTS=999

some-service:
  image: ...
  environment:
    SERVER_URL: "http://docker-host:999"
  command: ...
  depends_on:
    - docker-host

回答3:

For linux there isn't a default DNS name for the host machine. This can be verified by running the command:

docker run -it alpine cat /etc/hosts

This feature has been requested, however wasn't implemented. You can check this issue. As discussed you can use the following command to find the IP of the host from the container.

netstat -nr | grep '^0\.0\.0\.0' | awk '{print $2}'

Alternatively, you can provide the host ip to the run command via docker run --add-host dockerHost:<ip-address> ...