Cluster reconfig left behind phantom VMs - possible to fix?


New Member
Nov 3, 2022
Greetings everyone, we needed to do some maintenance on a four node cluster. I moved the critical systems off of it but apparently the folks who were actually doing the removal and replacement of a node neglected to remove the noncritical VMs from it before using pvecm to remove it from the cluster. It looks like to me that they did the cluster removal correctly, which is great, but since they didn't remove the vms, now we have some VMs just floating out in null space that don't exist.

I saw this thread about trying to remove them from the filesystem manually, but that was in a two node cluster.

I'm debating about just bringing the errant node up as a new node/new name and just leaving the old one out forever, but let's say hypothetically I wanted to remove the phantom VMs and put the node back as its old name. I'm guessing that _if_ I actually wanted to try and remove those phantom vms, I could remove /etc/pve/nodes/pve03/qemu-server/*, basically, correct? What would the steps be? Would it be as simple as

  • stop pve-cluster and corosync on all remaining nodes
  • pmxcfs -l
  • remove the offending phantom vms
  • stop pmxcfs
  • restart pve-cluster and corosync
  • and then bring the missing node back into the cluster?
the big question here is, can I remove the vm listings with the cluster up? Or would the best attempt be to shut down the cluster as above and remove the entries from each individual node, then bring it all back up?
since you still have quorum, you should be able to just go to /etc/pve/nodes and remove the directory for the removed node (after checking again, it doesn't contain anything relevant). Also please note (from the docs):
If, for whatever reason, you want this server to join the same cluster again, you have to:
  • do a fresh install of Proxmox VE on it,
  • then join it, as explained in the previous section.
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Reactions: mav
For what it's worth this seems to have worked well. Cluster was cleaned up and I was able to add a new node back in.


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