Steve Lorimer wrote:
Ok, should be a simple question here: How to backup a KVM host image.
My first plan - failure:
1) Suspend / hibernate (using virsh ... save) image to disk
2) Backup vm disk image & suspend file
3) Backup .xml
4) Restore suspended image
This would accomplish a backup that could be reactivated very quickly
as bootup would not even be required.
However, in testing it failed. Of two VM's tried, one worked, but the
other one never came back up. The network interface never reenabled
and this system itself sat maxing out it's cpu core until manually
terminated.
That's a bug. If you can reproduce this on the latest kvm, and provide
instructions for us on how to reproduce this, we will try to fix it.
My second plan:
1) Use virsh to shutdown the VM
2) Backup vm file & xml
3) Start vm (regular bootup)
This takes longer, but can be tolerated in order to get a backup.
However, this fails also:
virsh -c qemu:///system shutdown kvmtest
The command fails to send any kind of shutdown request to the VM
guest. As a result, the only thing that works is to kill it (the
virsh command for that does work). However, this is not acceptable
for a backup.
Nothing out of the ordinary in my system setup:
VM Server: Ubuntu Server
Guest OS's: Also Ubuntu
Any thoughts, advice?
If your backing store supports snapshots (btrfs, lvm) you could create a
snapshot while the guest is running, and backup the snapshot.
The integrity of the backup depends on whether the guest is able to
recover from restarts.
--
error compiling committee.c: too many arguments to function
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