.polyfill_docker_host.sh

#!/bin/sh

if [ "$(getent hosts host.docker.internal)" = "" ]; then
  ip=$(getent hosts docker.for.mac.localhost docker.for.win.localhost docker.for.linux.localhost | awk '{print $1}')

  if [ "${ip}" = "" ]; then
    ip=$(ip -4 route list match 0/0 | awk '{print $3}')
  fi

  echo -e "${ip}\thost.docker.internal\n" | tee -a /etc/hosts > /dev/null
fi

README.md

polyfill_docker_host

How to get it

Initialize the git submodules

git submodule init

Then add this gist as a submodule

git submodule add https://gist.github.com/EnoahNetzach/c8232c5de96f1da47a7d9fdfcd728373 polyfill_docker_host

How to use it

Add the following to your Dockerfile:

COPY .polyfill_docker_host.sh /.polyfill_docker_host.sh

Then use it in your docker-compose.yaml file:

services:
  service_name:
    command: /bin/sh -c "/.polyfill_docker_host.sh; wget -qO- http://host.docker.internal"

LICENSE

MIT License

Copyright (c) 2019 Fabrizio Castellarin

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.