Why group name "docker" is not created on installation of docker on mac?

Question

After running:

  brew cask install docker

UNIX socket file is not part of docker group in my mac laptop(docker host)

$ ls -l /var/run/docker.sock
lrwxr-xr-x  1 root  daemon  70 12 Jan 08:19 /var/run/docker.sock -> /Users/user1/Library/Containers/com.docker.docker/Data/docker.sock

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because docker group is not created

 $ cat /etc/group | grep docker
 $ uname -a
Darwin user1 18.7.0 Darwin Kernel Version 18.7.0: Sun Dec  1 18:59:03 PST 2019; root:xnu-4903.278.19~1/RELEASE_X86_64 x86_64

 $
 $ cat /etc/group | grep daemon
 daemon:*:1:root

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On ubuntu docker group name gets created, after installation of docker

Running jenkins docker container(as DIND), but cannot perform usermod -aG docker jenkins within Dockerfile.

Goal is to run docker client within jenkins container that can talk to docker daemon running on docker host, through UNIX socket file(/var/run/docker.sock).

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Why installation of docker on mac does not create docker group?

How to resolve this problem?

Answer 1

Docker for Mac is just special like that. You can solve it few ways:

From least recommended to most recommended order:

1. Modify the permission of /var/run/docker.sock so that other groups can access the socket.
2. Give sudo access to the jenkins user
3. Use socat to expose the daemon on tcp socket instead.

From https://www.benjaminpack.com/blog/docker-jenkins-mac/

The socat process wraps /var/run/docker.sock on the host by way of a mounted volume and exposes it in a bi-directional fashion as a TCP server to Jenkins. All without giving Jenkins more permissions than it needs.