Preface I want to write a universal shell-script which will add a proper IP address of docker host machine to /etc/hosts inside of container. You will probably advice me to put the service I want to access in another docker container too but for fastest tests on CI I want to access docker host machine by ip from container, that's why I need it. There was an where people were asking to make unified way to access host ip. There is no common solution for all platforms atm. People make scripts like this: grep dockerhost /etc/hosts echo $(ip r grep ^default cut -d' ' -f3) dockerhost >> /etc/hosts In order to access docker host machine I would like to use the same approach but it does not work for Mac atm.

The result returned by: ip r grep ^default cut -d' ' -f3 will give a wrong answer 172.17.0.1 if Docker host machine is Mac (You won't be able actually to access your Mac from container with 172.17.0.1). That's why there is a feature in Docker for Mac - docker.for.mac.localhost with which you can access your host Mac from container. The problem I would like to write a universal shell script which will first try to resolve docker.for.mac.localhost and add the resolved address to /etc/hosts. If not (which means docker host is either windows or linux, not Mac), use the ip r grep ^default cut -d' ' -f3 approach and add to /etc/hosts too. The question is: How can I try to resolve docker.for.mac.localhost in ANY container?

(some distros do not have nslookup for example). Or maybe I should not try to resolve and I can just try to read docker.for.mac.localhost value from somewhere? My current thoughts are to try to use getent ahosts docker.for.mac.localhost, then in case command does not exist I will try to use nslookup (i.e. Busybox image does not have getent command). Probably I am wrong trying to resolve docker.for.mac.localhost and it can be retrieved in easier way.

Please share your thoughts.

This is a fairly new feature of Docker for Mac 17.04, and isn't nearly used enough. The 'delegated' flag is the one you want to use. This postpones writes back to the host in order to achieve higher filesystem throughput. Enjoy your modified Docker setup! Hope you experience much better performance as Docker for Mac continues to get better each.

Amt emulator for mac os. Networking using the host network Estimated reading time: 2 minutes This series of tutorials deals with networking standalone containers which bind directly to the Docker host’s network, with no network isolation. For other networking topics, see the. Goal The goal of this tutorial is to start a nginx container which binds directly to port 80 on the Docker host. From a networking point of view, this is the same level of isolation as if the nginx process were running directly on the Docker host and not in a container. However, in all other ways, such as storage, process namespace, and user namespace, the nginx process is isolated from the host. Prerequisites • This procedure requires port 80 to be available on the Docker host.