The last time I did a qemu-kvm upgrade, my host became down and the vms on it with a question mark and no possibility to interact with them. My only solution was to use the "confirm host has rebooted" to fence the vms, and then the nightmare began : the high
Le 23/01/2017 à 13:08, Yaniv Kaul a écrit :
On Mon, Jan 23, 2017 at 1:38 PM, Nathanaël Blanchet <blanchet@abes.fr> wrote:
Hi
The update notifier in the webadmin was originally designed to alert for new vdsm* packages. Now, I noticed that available update of virt packages and more are notified. I know that hot updating qemu-kvm package does break vms that are running on concerned hosts, but what about other one like libvirt-client? I know it is recommended to put in maintenance while updating, but can we update some minor packages without waiting for migration?
Hot-updating any package should not break any running VMs. If it does, it's a bug.
availaible vms rebooted on an other host while they were still active on the first one, so they were up on two hosts at the same time. Their disk began to be written by two vms at the same time and I had to fscsk them to make them up on the next boot. Some database vms were completely unusabled!
So I'm very surprised to hear that it is possible to do hot-updating on these kind of upgrade, and I won't do it anymore!
I personally agree it's not the best habit to do it nevertheless, and I expect users to put hosts to maintenance before performing any upgrade.
We cannot tell which update requires maintenance and which doesn't (or for that matter - requires a reboot or a service restart) - there's no metadata available to do attached to the packages that can tell us that.Y.
--
Nathanaël Blanchet
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Pôle Infrastrutures Informatiques
227 avenue Professeur-Jean-Louis-Viala
34193 MONTPELLIER CEDEX 5
Tél. 33 (0)4 67 54 84 55
Fax 33 (0)4 67 54 84 14
blanchet@abes.fr
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-- Nathanaël Blanchet Supervision réseau Pôle Infrastrutures Informatiques 227 avenue Professeur-Jean-Louis-Viala 34193 MONTPELLIER CEDEX 5 Tél. 33 (0)4 67 54 84 55 Fax 33 (0)4 67 54 84 14 blanchet@abes.fr