Bypassing backup and restore when upgrading
The following is only for advanced users which have knowledge about Proxmox configuration files!
Since Backup and Restore can be a time-consuming process in the following a more rapid method is described - possible only if the (virtual) disk(s) for the VM(s) is (are) located at a storage which is not touched by the installation process (e.g. NFS at an external server)
- Backup all VMs
- Restore full VMs from Backups
will be replaced by
- Backup <vmid>.conf file(s) for the respective machine(s), they are located under /etc/pve/nodes/<nodename>/lxc/ and /etc/pve/nodes/<nodename>/qemu-server/ respectively
- Backup those storages from the storage configuration ( /etc/pve/storage.cfg ) which are shared and untouched, simply copy the respective lines and append them once to the newly build clusters /etc/pve/storage.cfg
- Restore <vmid>.conf file(s) for the respective machine(s)
Note: /etc/pve/lxc/ and /etc/pve/qemu-server/ are virtual symlinks for the current nodes lxc and qemu directory.
After you restored the VM configs and restored the external shared Storage configuration - so that it is accessible under the same name in the new cluster again - you should be able to start the VMs again. No additional reboot is required.