This is a multi-part message in MIME format. --------------E83A5F83A0804BCBACCC816A Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: quoted-printable Le 23/01/2017 =C3=A0 13:08, Yaniv Kaul a =C3=A9crit :
On Mon, Jan 23, 2017 at 1:38 PM, Nathana=C3=ABl Blanchet <blanchet@abes=
.fr=20
<mailto: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,=20 it's a bug. The last time I did a qemu-kvm upgrade, my host became down and the vms=20 on it with a question mark and no possibility to interact with them. My=20 only solution was to use the "confirm host has rebooted" to fence the=20 vms, and then the nightmare began : the high availaible vms rebooted on=20 an other host while they were still active on the first one, so they=20 were up on two hosts at the same time. Their disk began to be written by=20 two vms at the same time and I had to fscsk them to make them up on the=20 next boot. Some database vms were completely unusabled!
So I'm very surprised to hear that it is possible to do hot-updating on=20 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=20 I expect users to put hosts to maintenance before performing any upgrad= e.
We cannot tell which update requires maintenance and which doesn't (or=20 for that matter - requires a reboot or a service restart) - there's no=20 metadata available to do attached to the packages that can tell us that= . Y.
--=20 Nathana=C3=ABl Blanchet
Supervision r=C3=A9seau P=C3=B4le Infrastrutures Informatiques 227 avenue Professeur-Jean-Louis-Viala 34193 MONTPELLIER CEDEX 5 T=C3=A9l. 33 (0)4 67 54 84 55 Fax 33 (0)4 67 54 84 14 blanchet@abes.fr <mailto:blanchet@abes.fr>
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--=20 Nathana=C3=ABl Blanchet Supervision r=C3=A9seau P=C3=B4le Infrastrutures Informatiques 227 avenue Professeur-Jean-Louis-Viala 34193 MONTPELLIER CEDEX 5 =09 T=C3=A9l. 33 (0)4 67 54 84 55 Fax 33 (0)4 67 54 84 14 blanchet@abes.fr --------------E83A5F83A0804BCBACCC816A Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable <html> <head> <meta content=3D"text/html; charset=3Dutf-8" http-equiv=3D"Content-Ty= pe"> </head> <body text=3D"#000000" bgcolor=3D"#FFFFFF"> <p><br> </p> <br> <div class=3D"moz-cite-prefix">Le 23/01/2017 =C3=A0 13:08, Yaniv Kaul= a =C3=A9crit=C2=A0:<br> </div> <blockquote cite=3D"mid:CAJgorsZscAF9uQ=3DWcjwFEg0EB1XNOEV2Abnrr0NxNiKZrpHwaA@mail.gm= ail.com" type=3D"cite"> <div dir=3D"ltr"><br> <div class=3D"gmail_extra"><br> <div class=3D"gmail_quote">On Mon, Jan 23, 2017 at 1:38 PM, Nathana=C3=ABl Blanchet <span dir=3D"ltr"><<a moz-do-not-send=3D"true" href=3D"mailto:blanchet@abes.fr" target=3D"_blank"><a class=3D"moz-txt-link-abbreviated" h= ref=3D"mailto:blanchet@abes.fr">blanchet@abes.fr</a></a>></span> wrote= :<br> <blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi<br> <br> 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?<br> </blockquote> <div><br> </div> <div>Hot-updating any package should not break any running VMs. If it does, it's a bug.</div> </div> </div> </div> </blockquote> 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!<br> <br> So I'm very surprised to hear that it is possible to do=C2=A0 hot-updating on these kind of upgrade, and I won't do it anymore!<br> <blockquote cite=3D"mid:CAJgorsZscAF9uQ=3DWcjwFEg0EB1XNOEV2Abnrr0NxNiKZrpHwaA@mail.gm= ail.com" type=3D"cite"> <div dir=3D"ltr"> <div class=3D"gmail_extra"> <div class=3D"gmail_quote"> <div>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.</div> <div><br> </div> <div>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.</div> <div>Y.</div> <div>=C2=A0</div> <blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> <br> <br> -- <br> Nathana=C3=ABl Blanchet<br> <br> Supervision r=C3=A9seau<br> P=C3=B4le Infrastrutures Informatiques<br> 227 avenue Professeur-Jean-Louis-Viala<br> 34193 MONTPELLIER CEDEX 5=C2=A0 =C2=A0 =C2=A0 =C2=A0<br> T=C3=A9l. 33 (0)4 67 54 84 55<br> Fax=C2=A0 33 (0)4 67 54 84 14<br> <a moz-do-not-send=3D"true" href=3D"mailto:blanchet@abes.fr= " target=3D"_blank">blanchet@abes.fr</a><br> <br> ______________________________<wbr>_________________<br> Users mailing list<br> <a moz-do-not-send=3D"true" href=3D"mailto:Users@ovirt.org" target=3D"_blank">Users@ovirt.org</a><br> <a moz-do-not-send=3D"true" href=3D"http://lists.ovirt.org/mailman/listinfo/users" rel=3D"noreferrer" target=3D"_blank">http://lists.ovirt.o= rg/mailman<wbr>/listinfo/users</a><br> </blockquote> </div> <br> </div> </div> </blockquote> <br> <pre class=3D"moz-signature" cols=3D"72">--=20 Nathana=C3=ABl Blanchet Supervision r=C3=A9seau P=C3=B4le Infrastrutures Informatiques 227 avenue Professeur-Jean-Louis-Viala 34193 MONTPELLIER CEDEX 5 =09 T=C3=A9l. 33 (0)4 67 54 84 55 Fax 33 (0)4 67 54 84 14 <a class=3D"moz-txt-link-abbreviated" href=3D"mailto:blanchet@abes.fr">bl= anchet@abes.fr</a> </pre> </body> </html> --------------E83A5F83A0804BCBACCC816A--