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In my experience and for my mostly basic needs, major differences between libvirt and proxmox:
virt-clone
andvirt-sysprep
.virt-install
and a Debian preseed.cfg to provision new templates, on proxmox I do it... well... manually. But both support cloud-init based provisioning so I might standardize to that in the future (and ditch templates)LXD/Incus provides a management and automation layer that really makes things work smoothly essentially replacing Proxmox. With Incus you can create clusters, download, manage and create OS images, run backups and restores, bootstrap things with cloud-init, move containers and VMs between servers (even live sometimes) and those are just a few things you can do with it and not with pure KVM/libvirt. Also has a WebUI for those interested.
A big advantage of LXD is the fact that it provides a unified experience to deal with both containers and VMs, no need to learn two different tools / APIs as the same commands and options will be used to manage both. Even profiles defining storage, network resources and other policies can be shared and applied across both containers and VMs.
Incus isn’t about replacing existing virtualization techniques such as QEMU, KVM and libvirt, it is about augmenting them so they become easier to manage at scale and overall more efficient. It plays on the land of, let’s say, Proxmox and I can guarantee you that most people running it today will eventually move to Incus and never look back. It woks way better, true open-source, no bugs, no holding back critical fixes for paying users and way less overhead.
My understanding is that for proper cluster management you slap Pacemaker on there.
You can perform a live migration without shared storage with libvirt
I should RTFM again... https://manpages.debian.org/bookworm/libvirt-clients/virsh.1.en.html has options for
virsh migrate
such as--copy-storage-all
... Not sure how it would work for actual live migrations but I will definitely check it out. Thanks for the hintPretty darn well. I actually needed to do some maintenance on the server earlier today so I just migrated all of the VMs over to my desktop, did the server maintenance, and then moved the VMs back over to the server, all while live and functioning. Running ping in the background looks like it missed a handful of pings as the switches figured their life out and then was right back where they were; not even long enough for uptime-kuma to notice.