Add support for docker run --group-add option

[ndeloof]

For container to access host docker daemon, I use to bind mount /var/run/docker.sock and docker executable. But then I also need to add docker group to the container user so it can access the socket. For this purpose I use docker run --group-add option, but can't find how to do the same with docker-compose.

[pwFoo]

Any schedule to add "--group-add" to docker-compose?

[Knetic]

I needed this too, and took a crack at it with PR #3709.

[pwFoo]

Thanks, @Knetic !
I'll follow #3709

[arno01]

It was merged and is available in 1.9.0-rc4 https://github.com/docker/compose/releases :-]
I think this issue can be closed.

[psoares]

I couldn't get this to work. The documentation seems wrong : it displays a snippet like this :

version: '3'
services:
    image: alpine
    group_add:
      - mail

Running docker-compose with this returns Unsupported config option for services: 'group_add'

I tried this too :

version: '3'
services:
    myservice:
        image: alpine
        group_add:
          - mail

Running docker-compose with this returns Unsupported config option for services.myservice: 'group_add'

Is the option available somehow and the bug is just in the documentation ?

[psoares]

I fixed my examples to reflect what I actually tested, which was version: '3', not version: '2'

[Shingaz]

@psoares group_add feature has been removed in version 3. See: https://docs.docker.com/compose/compose-file/compose-versioning/#version-3

[head1328]

Is there any reason why they removed group_add support?

[mattwilmott]

Yeah I mean the migration doco doesn't exactly spell out the alternative...

"group_add: This option has been removed for version: "3.x" Compose files."

Similar to others, I'm hoping to expose the underlying docker socket in a Jenkins container

[anthony-bernardo]

How to do now ??

[kavehv]

Agree with the others here, why was this removed without any explanation?

[moble]

This comment suggests that this is not the appropriate repo for this request. (I don't understand any of this.) Anyway, as suggested, I've created an issue requesting this over here.

[ijc]

Issue grooming: dada36f added this for v2 it seems. The issue with v3 support is different and according to the preceding comments are already reported in the appropriate places.