[ovirt-users] Ovirt-3.4.1: How to: Upgrading Hosted Engine Cluster

[Doron Fediuck]

----- Original Message -----
> From: "Doron Fediuck" <dfediuck at redhat.com>
> To: "Daniel Helgenberger" <daniel.helgenberger at m-box.de>
> Cc: users at ovirt.org
> Sent: Saturday, May 10, 2014 9:47:29 AM
> Subject: Re: [ovirt-users] Ovirt-3.4.1: How to: Upgrading Hosted Engine Cluster
> 
> 
> 
> ----- Original Message -----
> > From: "Daniel Helgenberger" <daniel.helgenberger at m-box.de>
> > To: users at ovirt.org
> > Sent: Friday, May 9, 2014 6:45:36 PM
> > Subject: [ovirt-users] Ovirt-3.4.1: How to: Upgrading Hosted Engine Cluster
> > 
> > Hello,
> > 
> > failing to find a procedure how to actually upgrade a HA cluster, I did
> > the following witch turned out to be working pretty well.
> > 
> > I am somewhat new to oVirt and was amazed how well actually; I did not
> > need to shutdown a single VM (well, one because of mem usage; many of my
> > running VMs have fancy stuff like iscsi and FC luns via a Quantum
> > Stornext HA Cluster):
> > 
> >      1. Set cluster to global maintance
> >      2. Login to ovit engine and to the upgrade according to the release
> >         nodes.
> >      3. After the upgrade is finished and the engine running, set the
> >         first Node in local maintenance.
> >      4. Login the first node and yum update (with the removal of
> >         ovirt-release as mentioned in release notes).* I rebooted the
> >         node because of the kernel update.
> >      5. Return to oVirt and reinstall the Node from GUI, it will be set
> >         to operational automatically**
> >      6. Repeat steps 3-6 for the rest of the Nodes.
> >      7. Remove global maintenance.
> >      8. Update the last Node.***
> > 
> > * I first tried to do this with re-install from GUI. This failed; so I
> > used the yum - update method to update all relevant services
> > 
> > ** I do not know if this was necessary. I did this because the
> > hosted-engine --deploy does the same thing when adding a host.
> > 
> > *** I found this to be necessary because I had all my Nodes in local
> > maintenance and could not migrate the Hosted engine from the last node
> > any more. The host activation in oVirt did not remove the local
> > maintenance set prior to the update (witch it should, IMHO). It might be
> > desirable to have a hosted-engine command option to remove local
> > maintenance for that reason.
> > 
> > 
> > 
> > --
> > 
> > Daniel Helgenberger
> > m box bewegtbild GmbH
> > 
> > P: +49/30/2408781-22
> > F: +49/30/2408781-10
> > 
> > ACKERSTR. 19
> > D-10115 BERLIN
> > 
> > 
> > www.m-box.de  www.monkeymen.tv
> > 
> > Geschäftsführer: Martin Retschitzegger / Michaela Göllner
> > Handeslregister: Amtsgericht Charlottenburg / HRB 112767
> > 
> 
> Hi Martin,
> Thanks for sharing!
> 
> A few notes on your nice 8 steps ;)
> 
> - There are 2 maintenance modes to cover host maintenance (local) and
>   VM maintenance (global). Global maintenance disarms all HA hosts in
>   the cluster, so use it with caution as there's no fail over in this
>   mode.
> 
> - Initially these were available only as a command line[1]. Since 3.4.0,
>   this was integrated into the UI, so all you need to do is move a host
>   to maintenance in order to achieve local maintenance, and activate it
>   to remove the maintenance mode. For global maintenance, right click
>   the engine VM, and you will see enable/disable ha-maintenance for
>   the global mode.
> 
> - No need to re-install nodes. All you need to do is activate it.
> 
> - Basically a standard procedure should include:
>   * Move host to maintenance, login and update the host, activate the host.
>   * Follow the above for all other HA hosts
>   * Set the engine VM to ha maintenance (global), login to the vm and
>     upgrade it, unset vm's ha-maintenance.
> 
> Appreciate your feedback.
> Also, were you aware of [1] or did you look for info elsewhere? I'd like
> to know what we can do to improve documentation.
> 
> Thanks again,
> Doron
> 
> [1] http://www.ovirt.org/Hosted_Engine_Howto#Maintaining_the_setup

My apologies- s/Martin/Daniel.