From blanchet at abes.fr Mon Jan 23 13:20:28 2017 Content-Type: multipart/mixed; boundary="===============5706163020655478163==" MIME-Version: 1.0 From: =?utf-8?q?Nathana=C3=ABl_Blanchet_=3Cblanchet_at_abes=2Efr=3E?= To: users at ovirt.org Subject: Re: [ovirt-users] packages that can be updated without maintening hosts Date: Mon, 23 Jan 2017 14:20:27 +0100 Message-ID: In-Reply-To: CAJgorsZscAF9uQ=WcjwFEg0EB1XNOEV2Abnrr0NxNiKZrpHwaA@mail.gmail.com --===============5706163020655478163== Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable This is a multi-part message in MIME format. --------------E83A5F83A0804BCBACCC816A Content-Type: text/plain; charset=3Dutf-8; format=3Dflowed Content-Transfer-Encoding: quoted-printable Le 23/01/2017 =3DC3=3DA0 13:08, Yaniv Kaul a =3DC3=3DA9crit : > > > On Mon, Jan 23, 2017 at 1:38 PM, Nathana=3DC3=3DABl Blanchet > 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,=3D= 20 > it's a bug. The last time I did a qemu-kvm upgrade, my host became down and the vms=3D20 on it with a question mark and no possibility to interact with them. My=3D20 only solution was to use the "confirm host has rebooted" to fence the=3D20 vms, and then the nightmare began : the high availaible vms rebooted on=3D20 an other host while they were still active on the first one, so they=3D20 were up on two hosts at the same time. Their disk began to be written by=3D= 20 two vms at the same time and I had to fscsk them to make them up on the=3D20 next boot. Some database vms were completely unusabled! So I'm very surprised to hear that it is possible to do hot-updating on=3D20 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=3D20 > I expect users to put hosts to maintenance before performing any upgrad= =3D e. > > We cannot tell which update requires maintenance and which doesn't (or=3D= 20 > for that matter - requires a reboot or a service restart) - there's no=3D= 20 > metadata available to do attached to the packages that can tell us that= =3D . > Y. > > > > --=3D20 > Nathana=3DC3=3DABl Blanchet > > Supervision r=3DC3=3DA9seau > P=3DC3=3DB4le Infrastrutures Informatiques > 227 avenue Professeur-Jean-Louis-Viala > 34193 MONTPELLIER CEDEX 5 > T=3DC3=3DA9l. 33 (0)4 67 54 84 55 > Fax 33 (0)4 67 54 84 14 > blanchet(a)abes.fr > > _______________________________________________ > Users mailing list > Users(a)ovirt.org > http://lists.ovirt.org/mailman/listinfo/users > > > --=3D20 Nathana=3DC3=3DABl Blanchet Supervision r=3DC3=3DA9seau P=3DC3=3DB4le Infrastrutures Informatiques 227 avenue Professeur-Jean-Louis-Viala 34193 MONTPELLIER CEDEX 5 =3D09 T=3DC3=3DA9l. 33 (0)4 67 54 84 55 Fax 33 (0)4 67 54 84 14 blanchet(a)abes.fr --------------E83A5F83A0804BCBACCC816A Content-Type: text/html; charset=3Dutf-8 Content-Transfer-Encoding: quoted-printable

Le 23/01/2017 =3DC3=3DA0 13:08, Yaniv = Kaul=3D a =3DC3=3DA9crit=3DC2=3DA0:

On Mon, Jan 23, 2017 at 1:38 PM, Nathana=3DC3=3DABl Blanchet <blanchet(a)abes.fr> w= rote=3D :

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.

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 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=3DC2=3DA0 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.

=3DC2=3DA0

--
Nathana=3DC3=3DABl Blanchet

Supervision r=3DC3=3DA9seau
P=3DC3=3DB4le Infrastrutures Informatiques
227 avenue Professeur-Jean-Louis-Viala
34193 MONTPELLIER CEDEX 5=3DC2=3DA0 =3DC2=3DA0 =3DC2=3DA0 =3D= C2=3DA0
T=3DC3=3DA9l. 33 (0)4 67 54 84 55
Fax=3DC2=3DA0 33 (0)4 67 54 84 14
blanchet(a)abes.fr

_______________________________________________
Users mailing list
Users(a)ovirt.org
http://lists.ovirt= .o=3D rg/mailman/listinfo/users

--=3D20
Nathana=3DC3=3DABl Blanchet

Supervision r=3DC3=3DA9seau
P=3DC3=3DB4le Infrastrutures Informatiques
227 avenue Professeur-Jean-Louis-Viala
34193 MONTPELLIER CEDEX 5 =3D09
T=3DC3=3DA9l. 33 (0)4 67 54 84 55
Fax  33 (0)4 67 54 84 14
bl=3D
anchet(a)abes.fr

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