Re: [libvirt-users] KVM incremental backup using CBT

On 10/29/2014 01:07 PM, Thomas Stein wrote: > About the --quiesce option. Do i need to do something inside the vm? The > most commonly would probably be a sql server running inside the vm. Do i > need to tell the sql server something about the --quiesce option i use? I > read this article here which suggests such a procedure. Okay, it's > vmware, but... Is that right? For --quiesce to work, you have to have qemu-guest-agent installed and running in your guest, and also inform libvirt via the domain XML to establish a channel to the guest agent. Furthermore, if you want your sql database to be at a stable point, you can install freeze hooks in your guest that get invoked prior to freezing the file system and just after thawing it (that is, qemu-guest-agent already has documented hooks that let you do any additional prep work beyond just freezing the file system). A quick google search found this: http://callecalle.uach.cl/ovirt-engine/docs/manual/en_US/html/Technical_Guid e/QEMU_Guest_Agent_Overview.html Sadly, it didn't spell out the name of where you install hook scripts into the guest. But this commit is pretty telling: https://github.com/qemu/qemu/blob/master/scripts/qemu-guest-agent/fsfreeze-h ook