Changing VMID of a VM

[TwiX]

Hi,

Changing a VMID directly isn’t supported in Proxmox. The recommended way is to back up the VM and restore it using the new VMID. This ensures everything stays consistent and avoids storage issues,

But vmgenid will change...
In very rare scenarios, for Windows OS (SQL Server cluster, AD PDC eg.) which are aware of vmgenid, restart after such restoration may have some unforeseen consequences.
So, restoring the old vmgenid before booting the vm again OR using that kind of script/change manually id/vm-disks names.

 

[shodan]

Hi,

This thread is the top thread for google search

proxmox how to change vmid

For some reason I wanted to change the VMID of some VMs and was frustrated to find it's not easy.

I also figured out while I'm at it, there's a bunch of other stuff like that.

Too hard to remember, to easy to automate and too rarely needed to do something about it !

So I did something about it. And I put it on github LongTailToil

And here is the solution for this problem, if you only use LVM2.

First you download the script

wget -q "https://raw.githubusercontent.com/proxmoxhelpers/Proxmox-LongTailToil/main/change-vmid-of-vm.sh" -O "change-vmid-of-vm.sh" && chmod +x "change-vmid-of-vm.sh"

Then you run it.

./change-vmid-of-vm.sh 123 456 dryrun

So here is my VM before


And running the script, it's a bit too verbose, but OK


And here is the result

Success !!!

And there are 35 more scripts I made.

I especially like
create-disk-snapshot-and-add-to-vm.sh
mount-vm-drives.sh
unmount-vm-drives.sh
move-lvm.sh

clone-vm-config-only.sh
recover-vm-from-volumes.sh
list-vm-disks.sh
audit-vm-storage.sh
find-volume-owner.sh
find-orphaned-volumes.sh
copy-lvm.sh
rename-lvm.sh
delete-lvm.sh
mount-vm-disk.sh
mount-vm-root.sh
attach-existing-lvm-to-vm.sh
detach-disk-from-vm.sh
delete-disk-from-vm.sh
cleanup-unused-disks.sh
create-disk-copy-and-add-to-vm.sh
copy-disk-between-vms.sh
snapshot-disk-between-vms.sh
clone-single-vm-disk.sh
change-disk-bus.sh
swap-vm-disks.sh
set-vm-boot-disk.sh
replace-vm-disk.sh
renumber-vm-disks.sh
fix-vm-volume-names.sh
move-disk-to-storage.sh
bulk-change-vm-storage.sh
change-vm-storage-prefix.sh
import-disk-and-attach.sh
export-vm-disk.sh
bulk-change-vm-network.sh

Let me know if you find any bugs but they're all tested, there's even a test suite you can run with

test/run-all-tests.sh --run --verbose