Allow to specify docker network options, such as mtu

Describe the enhancement It would be great to set up custom options for networks created for container jobs. As of now, it is only possible to pass options to docker create command via jobs.<job_id>.container.options

Code Snippet This could look this way:

container:
  image: centos:7
  network:
    options:
      mtu: 1400

Additional information See, according to https://github.com/moby/moby/issues/34981 , docker daemon options, such as mtu, are not passed to new bridge networks. So my CI jobs fail while trying to e. g. run yum -y update.

NOTE: if the feature request has been agreed upon then the assignee will create an ADR. See docs/adrs/README.md

[alexdepalex]

Instead of applying all these hacks and using non-official container image (although thanks for making that available @tiagoblackcode), can we get this fixed in the runner itself? Seems like it comes down to checking the MTU from the network bridge and using that when creating the network.

https://github.com/actions-runner-controller/actions-runner-controller/issues/1046#issuecomment-1041354554

[kim0]

Hello @sharonovd … The lack of possibility to set MTU has bit me hard the past few days. Is there any progress on this front? Any workarounds available today to pass custom options at the docker network create step ? Thanks!