[ovirt-users] Proper way to change and persist vdsm configuration options

Tue Aug 5 18:45:05 UTC 2014

----- Original Message -----
> From: "Trey Dockendorf" <treydock at gmail.com>
> To: "ybronhei" <ybronhei at redhat.com>
> Cc: "users" <users at ovirt.org>, "Fabian Deutsch" <fabiand at redhat.com>, "Dan Kenigsberg" <danken at redhat.com>, "Itamar
> Heim" <iheim at redhat.com>, "Douglas Landgraf" <dougsland at redhat.com>, "Alon Bar-Lev" <alonbl at redhat.com>
> Sent: Tuesday, August 5, 2014 9:36:24 PM
> Subject: Re: [ovirt-users] Proper way to change and persist vdsm configuration options
> 
> On Tue, Aug 5, 2014 at 12:32 PM, ybronhei <ybronhei at redhat.com> wrote:
> > Hey,
> >
> > Just noticed something that I forgot about..
> > before filing new BZ, see in ovirt-host-deploy README.environment [1] the
> > section:
> > VDSM/configOverride(bool) [True]
> >     Override vdsm configuration file.
> >
> > changing it to false will keep your vdsm.conf file as is after deploying
> > the
> > host again (what happens after node upgrade)
> >
> > [1]
> > https://github.com/oVirt/ovirt-host-deploy/blob/master/README.environment
> >
> > please check if that what you meant..
> >
> > Thanks,
> > Yaniv Bronhaim.
> >
> 
> I was unaware of that package.  I will check that out as that seems to
> be what I am looking for.
> 
> I have not filed this in BZ and will hold off pending
> ovirt-host-deploy.  If you feel a BZ is still necessary then please do
> file one and I would be happy to provide input if it would help.
> 
> Right now this is my workflow.
> 
> 1. Foreman provisions bare-metal server with CentOS 6.5
> 2. Once provisioned and system rebooted Puppet applies puppet-ovirt
> [1] module that adds the necessary yum repos

and should stop here..

> , and installs packages.
> Part of my Puppet deployment is basic things like sudo management
> (vdsm's sudo is account for), sssd configuration, and other aspects
> that are needed by every system in my infrastructure.  Part of the
> ovirt::node Puppet class is managing vdsm.conf, and in my case that
> means ensuring iSER is enabled for iSCSI over IB.

you can create a file /etc/ovirt-host-deploy.conf.d/40-xxx.conf
---
VDSM_CONFIG/section/key=str:content
---

this will create a proper vdsm.conf when host-deploy is initiated.

you should now use the rest api to initiate host-deploy.

> 3. Once host is online and has had the full Puppet catalog applied I
> log into ovirt-engine web interface and add those host (pulling it's
> data via the Foreman provider).

right, but you should let this process install packages and manage configuration.

> What I've noticed is that after step #3, after a host is added by
> ovirt-engine, the vdsm.conf file is reset to default and I have to
> reapply Puppet before it can be used as the one of my Data Storage
> Domains requires iSER (not available over TCP).

right, see above.

> What would be the workflow using ovirt-host-deploy?  Thus far I've had
> to piece together my workflow based on the documentation and filling
> in blanks where possible since I do require customizations to
> vdsm.conf and the documented workflow of adding a host via web UI does
> not allow for such customization.
> 
> Thanks,
> - Trey
> 
> [1] - https://github.com/treydock/puppet-ovirt (README not fully
> updated as still working out how to use Puppet with oVirt)
> 
> >
> > On 08/05/2014 08:12 AM, Trey Dockendorf wrote:
> >>
> >> I'll file BZ.  As far as I can recall this has been an issue since 3.3.x
> >> as
> >> I have been using Puppet to modify values and have had to rerun Puppet
> >> after installing a node via GUI and when performing update from GUI.
> >> Given
> >> that it has occurred when VDSM version didn't change on the node it seems
> >> likely to be something being done by Python code that bootstraps a node
> >> and
> >> performs the other tasks.  I won't have any systems available to test with
> >> for a few days.  New hardware specifically for our oVirt deployment is on
> >> order so should be able to more thoroughly debug and capture logs at that
> >> time.
> >>
> >> Would using vdsm-reg be a better solution for adding new nodes?  I only
> >> tried using vdsm-reg once and it went very poorly...lots of missing
> >> dependencies not pulled in from yum install I had to install manually via
> >> yum.  Then the node was auto added to newest cluster with no ability to
> >> change the cluster.  Be happy to debug that too if there's some docs that
> >> outline the expected behavior.
> >>
> >> Using vdsm-reg or something similar seems like a better fit for puppet
> >> deployed nodes, as opposed to requiring GUI steps to add the node.
> >>
> >> Thanks
> >> - Trey
> >> On Aug 4, 2014 5:53 AM, "ybronhei" <ybronhei at redhat.com> wrote:
> >>
> >>> On 07/31/2014 01:28 AM, Trey Dockendorf wrote:
> >>>
> >>>> I'm running ovirt nodes that are stock CentOS 6.5 systems with VDSM
> >>>> installed.  I am using iSER to do iSCSI over RDMA and to make that
> >>>> work I have to modify /etc/vdsm/vdsm.conf to include the following:
> >>>>
> >>>> [irs]
> >>>> iscsi_default_ifaces = iser,default
> >>>>
> >>>> I've noticed that any time I upgrade a node from the engine web
> >>>> interface that changes to vdsm.conf are wiped out.  I don't know if
> >>>> this is being done by the configuration code or by the vdsm package.
> >>>> Is there a more reliable way to ensure changes to vdsm.conf are NOT
> >>>> removed automatically?
> >>>>
> >>>
> >>> Hey,
> >>>
> >>> vdsm.conf shouldn't wiped out and shouldn't changed at all during
> >>> upgrade.
> >>> other related conf files (such as libvirtd.conf) might be overrided to
> >>> keep
> >>> defaults configurations for vdsm. but vdsm.conf should persist with
> >>> user's
> >>> modification. from my check, regular yum upgrade doesn't touch vdsm.conf
> >>>
> >>> Douglas can you verify that with node upgrade? might be specific to that
> >>> flow..
> >>>
> >>> Trey, can file a bugzilla on that and describe your steps there?
> >>>
> >>> Thanks
> >>>
> >>> Yaniv Bronhaim,
> >>>
> >>>>
> >>>> Thanks,
> >>>> - Trey
> >>>> _______________________________________________
> >>>> Users mailing list
> >>>> Users at ovirt.org
> >>>> http://lists.ovirt.org/mailman/listinfo/users
> >>>>
> >>>>
> >>>
> >>> --
> >>> Yaniv Bronhaim.
> >>>
> >>
> >
> 