[SOLVED] Destroying CephFS storage/pools leaves orphaned mount points that cause multiple issues.

scyto

Active Member
Aug 8, 2023
310
55
28
I have been learning how to configure CephFS - as such i was creating storage, cephfs pools and ceph mds / destroying them and recreating them

i found it was really easy to hang gui completely if done in the destory was done in the wrong sequence

i resorted to using pveceph fs destroy ISOs-Templates --remove-pools 1 --remove-storages 1 on one FS to remove all remnants.

I found some issues after this:

  1. the /mnt/pve/ISOs-Templates mount point was not removed
  2. this created interesting errors when i tried to recreate a cephFS with this name (i couldn't create ISOs-Templates because apparently the mount point doesn't exist'
  3. when i use shell and cd /mnt/pve all is ok
  4. if i do ls everything is ok
  5. if i do ls-l the shell hangs
  6. if i try to rm ISOs-Templates i get an error that the target is not a directory
  7. umount -l -f doesn't do anything to help
I have tried stopping all mds and then deleting the mount points
i haven't tried rebooting a node or shutting down the full cluster

any ideas how to fix?
 
Last edited:
Thanks for the confirmation. I can reboot them one at a time or does the whole cluster need to come down?
 
Hi,
you can also try to unmount with umount -l -f /path/to/mount/point
 
umount -l -f /path/to/mount/point

Code:
root@pve1:/# ls /mnt/pve/
bar  cephfs  foo  ISOs-Templates  ISO-Template  test
root@pve1:/# umount -l -f /mnt/pve/foo
umount: /mnt/pve/foo: not mounted.


also if I do ls -l /mnt/pve the command hangs forever
 
Code:
root@pve1:/# ls /mnt/pve/
bar  cephfs  foo  ISOs-Templates  ISO-Template  test
root@pve1:/# umount -l -f /mnt/pve/foo
umount: /mnt/pve/foo: not mounted.
Well, /mnt/pve/foo is apparently not mounted, so not the hanging mount. Since ISOs-Templates is the storage you deleted, I guess you should've tried umount -l -f /mnt/pve/ISOs-Templates.
 
  • Like
Reactions: gurubert
Thanks Fiona, i had tried that before i posted, it was why i had posted.

I since rebooted all the nodes so no longer have the active repro.
I note there were other posts in the forums over multiple years with the same issue.
If and when I have an active repro I will post again.

Thanks for your help.
 

About

The Proxmox community has been around for many years and offers help and support for Proxmox VE, Proxmox Backup Server, and Proxmox Mail Gateway.
We think our community is one of the best thanks to people like you!

Get your subscription!

The Proxmox team works very hard to make sure you are running the best software and getting stable updates and security enhancements, as well as quick enterprise support. Tens of thousands of happy customers have a Proxmox subscription. Get yours easily in our online shop.

Buy now!