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.
View and access any of your repos right from your laptop using Docker for Mac or Docker for Windows. Connect to Any Docker Registry Docker Cloud allows you to connect to any registry that supports the Docker Registry API. May 7, 2018 - Docker for Mac uses HyperKit instead of Virtual Box. Vpnkit-forwarder forwards network traffic to/from the host via VSOCK port 62373.
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.