Jump to content

6.12.6: odd cgroup mount point causing problems with Hashicorp Nomad

Recommended Posts

I've been running Hashicorp Nomad to control the docker containers on my Unraid server for a while now, and encountered some errors when updating to the 1.7.x versions of it. The 1.7.0 version had some major updates to the way they handle cgroup version support detection, and is now failing to identify the cgroup v2 support of Unraid.


This seems to be caused by a rather odd mount configuration on Unraid. For the path `/sys/fs/cgroup` there are two mounts on top of each other:

# mount -l | grep cgroup
cgroup_root on /sys/fs/cgroup type tmpfs (rw,relatime,size=8192k,mode=755,inode64)
none on /sys/fs/cgroup type cgroup2 (rw,relatime)


These file systems are mounted in /etc/rc.d/rc.S. Comparing it to the init script in the upstream slackware sources, it seems to be different: https://mirrors.slackware.com/slackware/slackware64-15.0/source/a/sysvinit-scripts/scripts/rc.S. Can someone confirm this is a unraid-specific change? Is there some specific reason for the tmpfs mount, which seems to be unnecessary and causing my problem.


I've created a ticket on the Nomad issue tracker, link here for reference: https://github.com/hashicorp/nomad/issues/19735

Edited by googol
Link to comment
  • googol changed the title to 6.12.6: odd cgroup mount point causing problems with Hashicorp Nomad

@JorgeB sorry to pull you in like this out of the blue, but I see you are an active moderator. It seems to me that this forum might not be the best place to ask such a specific question about the OS. Do you know who I should contact about this, or who could be pulled in to this thread to shine a bit of light on this?

Link to comment

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Reply to this topic...

×   Pasted as rich text.   Restore formatting

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...