[ovirt-users] Hosted engine on gluster problem

David Gossage dgossage at carouselchecks.com
Mon Aug 29 12:11:53 EDT 2016 

On Mon, Aug 29, 2016 at 10:47 AM, Simone Tiraboschi <stirabos at redhat.com>
wrote:

>
>
> On Fri, Aug 26, 2016 at 8:54 AM, Sandro Bonazzola <sbonazzo at redhat.com>
> wrote:
>
>>
>>
>> On Tue, Aug 23, 2016 at 8:44 PM, David Gossage <
>> dgossage at carouselchecks.com> wrote:
>>
>>>
>>> On Fri, Apr 15, 2016 at 8:00 AM, Luiz Claudio Prazeres Goncalves <
>>> luizcpg at gmail.com> wrote:
>>>
>>>> I'm not planning to move to ovirt 4 until it gets stable, so would be
>>>> great to backport to 3.6 or ,ideally, gets developed on the next release of
>>>> 3.6 branch. Considering the urgency (its a single point of failure) x
>>>> complexity wouldn't be hard to make the proposed fix.
>>>>
>>>>
>>> Bumping old email sorry.  Looks like https://bugzilla.redhat.com/sh
>>> ow_bug.cgi?id=1298693 was finished against 3.6.7 according to that RFE.
>>>
>>> So does that mean if I add appropriate lines to my
>>>  /etc/ovirt-hosted-engine/hosted-engine.conf the next time I restart
>>> engine and agent/brokers to mount that storage point it will utilize the
>>> backupvol-server features?
>>>
>>> If so are appropriate settings outlined in docs somewhere?
>>>
>>> Running ovirt 3.6.7 and gluster 3.8.2 on centos 7 nodes.
>>>
>>
>> Adding Simone
>>
>
>
> First step, you have to edit
> /etc/ovirt-hosted-engine/hosted-engine.conf on all your hosted-engine
> hosts to ensure that the storage field always point to the same entry
> point (host01 for instance)
> Then on each host you can add something like:
> mnt_options=backupvolfile-server=host02.yourdomain.com:host03.
> <http://ost03.ovirt.forest.go.th/>yourdomain.com,fetch-
> attempts=2,log-level=WARNING,log-file=/var/log/engine_domain.log
>
> Then check the representation of your storage connection in the table
> storage_server_connections of the engine DB and make sure that connection
> refers to the entry point you used in hosted-engine.conf on all your
> hosts, you have lastly to set the value of mount_options also here.
>
> Please tune also the value of network.ping-timeout for your glusterFS volume
> to avoid this:
>  https://bugzilla.redhat.com/show_bug.cgi?id=1319657#c17
>
> You can find other information here:
> https://www.ovirt.org/develop/release-management/features/
> engine/self-hosted-engine-gluster-support/
>
>
Thanks, I'll review all that information.

>
>
>>
>>
>>>
>>>
>>> I'm using today a production environment on top of gluster replica 3 and
>>>> this is the only SPF I have.
>>>>
>>>> Thanks
>>>> Luiz
>>>>
>>>> Em sex, 15 de abr de 2016 03:05, Sandro Bonazzola <sbonazzo at redhat.com>
>>>> escreveu:
>>>>
>>>>> On Thu, Apr 14, 2016 at 7:35 PM, Nir Soffer <nsoffer at redhat.com>
>>>>> wrote:
>>>>>
>>>>>> On Wed, Apr 13, 2016 at 4:34 PM, Luiz Claudio Prazeres Goncalves
>>>>>> <luizcpg at gmail.com> wrote:
>>>>>> > Nir, here is the problem:
>>>>>> > https://bugzilla.redhat.com/show_bug.cgi?id=1298693
>>>>>> >
>>>>>> > When you do a hosted-engine --deploy and pick "glusterfs" you don't
>>>>>> have a
>>>>>> > way to define the mount options, therefore, the use of the
>>>>>> > "backupvol-server", however when you create a storage domain from
>>>>>> the UI you
>>>>>> > can, like the attached screen shot.
>>>>>> >
>>>>>> >
>>>>>> > In the hosted-engine --deploy, I would expect a flow which includes
>>>>>> not only
>>>>>> > the "gluster" entrypoint, but also the gluster mount options which
>>>>>> is
>>>>>> > missing today. This option would be optional, but would remove the
>>>>>> single
>>>>>> > point of failure described on the Bug 1298693.
>>>>>> >
>>>>>> > for example:
>>>>>> >
>>>>>> > Existing entry point on the "hosted-engine --deploy" flow
>>>>>> > gluster1.xyz.com:/engine
>>>>>>
>>>>>> I agree, this feature must be supported.
>>>>>>
>>>>>
>>>>> It will, and it's currently targeted to 4.0.
>>>>>
>>>>>
>>>>>
>>>>>>
>>>>>> > Missing option on the "hosted-engine --deploy" flow :
>>>>>> > backupvolfile-server=gluster2.xyz.com,fetch-attempts=3,log-l
>>>>>> evel=WARNING,log-file=/var/log/glusterfs/gluster_engine_domain.log
>>>>>> >
>>>>>> > Sandro, it seems to me a simple solution which can be easily fixed.
>>>>>> >
>>>>>> > What do you think?
>>>>>> >
>>>>>> > Regards
>>>>>> > -Luiz
>>>>>> >
>>>>>> >
>>>>>> >
>>>>>> > 2016-04-13 4:15 GMT-03:00 Sandro Bonazzola <sbonazzo at redhat.com>:
>>>>>> >>
>>>>>> >>
>>>>>> >>
>>>>>> >> On Tue, Apr 12, 2016 at 6:47 PM, Nir Soffer <nsoffer at redhat.com>
>>>>>> wrote:
>>>>>> >>>
>>>>>> >>> On Tue, Apr 12, 2016 at 3:05 PM, Luiz Claudio Prazeres Goncalves
>>>>>> >>> <luizcpg at gmail.com> wrote:
>>>>>> >>> > Hi Sandro, I've been using gluster with 3 external hosts for a
>>>>>> while
>>>>>> >>> > and
>>>>>> >>> > things are working pretty well, however this single point of
>>>>>> failure
>>>>>> >>> > looks
>>>>>> >>> > like a simple feature to implement,but critical to anyone who
>>>>>> wants to
>>>>>> >>> > use
>>>>>> >>> > gluster on production  . This is not hyperconvergency which has
>>>>>> other
>>>>>> >>> > issues/implications. So , why not have this feature out on 3.6
>>>>>> branch?
>>>>>> >>> > It
>>>>>> >>> > looks like just let vdsm use the 'backupvol-server' option when
>>>>>> >>> > mounting the
>>>>>> >>> > engine domain and make the property tests.
>>>>>> >>>
>>>>>> >>> Can you explain what is the problem, and what is the suggested
>>>>>> solution?
>>>>>> >>>
>>>>>> >>> Engine and vdsm already support the backupvol-server option - you
>>>>>> can
>>>>>> >>> define this option in the storage domain options when you create a
>>>>>> >>> gluster
>>>>>> >>> storage domain. With this option vdsm should be able to connect to
>>>>>> >>> gluster
>>>>>> >>> storage domain even if a brick is down.
>>>>>> >>>
>>>>>> >>> If you don't have this option in engine , you probably cannot add
>>>>>> it with
>>>>>> >>> hosted
>>>>>> >>> engine setup, since for editing it you must put the storage
>>>>>> domain in
>>>>>> >>> maintenance
>>>>>> >>> and if you do this the engine vm will be killed :-) This is is
>>>>>> one of
>>>>>> >>> the issues with
>>>>>> >>> engine managing the storage domain it runs on.
>>>>>> >>>
>>>>>> >>> I think the best way to avoid this issue, is to add a DNS entry
>>>>>> >>> providing the addresses
>>>>>> >>> of all the gluster bricks, and use this address for the gluster
>>>>>> >>> storage domain. This way
>>>>>> >>> the glusterfs mount helper can mount the domain even if one of the
>>>>>> >>> gluster bricks
>>>>>> >>> are down.
>>>>>> >>>
>>>>>> >>> Again, we will need some magic from the hosted engine developers
>>>>>> to
>>>>>> >>> modify the
>>>>>> >>> address of the hosted engine gluster domain on existing system.
>>>>>> >>
>>>>>> >>
>>>>>> >> Magic won't happen without a bz :-) please open one describing
>>>>>> what's
>>>>>> >> requested.
>>>>>> >>
>>>>>> >>
>>>>>> >>>
>>>>>> >>>
>>>>>> >>> Nir
>>>>>> >>>
>>>>>> >>> >
>>>>>> >>> > Could you add this feature to the next release of 3.6 branch?
>>>>>> >>> >
>>>>>> >>> > Thanks
>>>>>> >>> > Luiz
>>>>>> >>> >
>>>>>> >>> > Em ter, 12 de abr de 2016 05:03, Sandro Bonazzola <
>>>>>> sbonazzo at redhat.com>
>>>>>> >>> > escreveu:
>>>>>> >>> >>
>>>>>> >>> >> On Mon, Apr 11, 2016 at 11:44 PM, Bond, Darryl <
>>>>>> dbond at nrggos.com.au>
>>>>>> >>> >> wrote:
>>>>>> >>> >>>
>>>>>> >>> >>> My setup is hyperconverged. I have placed my test results in
>>>>>> >>> >>> https://bugzilla.redhat.com/show_bug.cgi?id=1298693
>>>>>> >>> >>>
>>>>>> >>> >>
>>>>>> >>> >> Ok, so you're aware about the limitation of the single point of
>>>>>> >>> >> failure.
>>>>>> >>> >> If you drop the host referenced in hosted engine configuration
>>>>>> for the
>>>>>> >>> >> initial setup it won't be able to connect to shared storage
>>>>>> even if
>>>>>> >>> >> the
>>>>>> >>> >> other hosts in the cluster are up since the entry point is
>>>>>> down.
>>>>>> >>> >> Note that hyperconverged deployment is not supported in 3.6.
>>>>>> >>> >>
>>>>>> >>> >>
>>>>>> >>> >>>
>>>>>> >>> >>>
>>>>>> >>> >>> Short description of setup:
>>>>>> >>> >>>
>>>>>> >>> >>> 3 hosts with 2 disks each set up with gluster replica 3
>>>>>> across the 6
>>>>>> >>> >>> disks volume name hosted-engine.
>>>>>> >>> >>>
>>>>>> >>> >>> Hostname hosted-storage configured in /etc//hosts to point to
>>>>>> the
>>>>>> >>> >>> host1.
>>>>>> >>> >>>
>>>>>> >>> >>> Installed hosted engine on host1 with the hosted engine
>>>>>> storage path
>>>>>> >>> >>> =
>>>>>> >>> >>> hosted-storage:/hosted-engine
>>>>>> >>> >>>
>>>>>> >>> >>> Install first engine on h1 successful. Hosts h2 and h3 added
>>>>>> to the
>>>>>> >>> >>> hosted engine. All works fine.
>>>>>> >>> >>>
>>>>>> >>> >>> Additional storage and non-hosted engine hosts added etc.
>>>>>> >>> >>>
>>>>>> >>> >>> Additional VMs added to hosted-engine storage (oVirt Reports
>>>>>> VM and
>>>>>> >>> >>> Cinder VM). Additional VM's are hosted by other storage -
>>>>>> cinder and
>>>>>> >>> >>> NFS.
>>>>>> >>> >>>
>>>>>> >>> >>> The system is in production.
>>>>>> >>> >>>
>>>>>> >>> >>>
>>>>>> >>> >>> Engine can be migrated around with the web interface.
>>>>>> >>> >>>
>>>>>> >>> >>>
>>>>>> >>> >>> - 3.6.4 upgrade released, follow the upgrade guide, engine is
>>>>>> >>> >>> upgraded
>>>>>> >>> >>> first , new Centos kernel requires host reboot.
>>>>>> >>> >>>
>>>>>> >>> >>> - Engine placed on h2 -  h3 into maintenance (local) upgrade
>>>>>> and
>>>>>> >>> >>> Reboot
>>>>>> >>> >>> h3 - No issues - Local maintenance removed from h3.
>>>>>> >>> >>>
>>>>>> >>> >>> - Engine placed on h3 -  h2 into maintenance (local) upgrade
>>>>>> and
>>>>>> >>> >>> Reboot
>>>>>> >>> >>> h2 - No issues - Local maintenance removed from h2.
>>>>>> >>> >>>
>>>>>> >>> >>> - Engine placed on h3 -h1 into mainteance (local) upgrade and
>>>>>> reboot
>>>>>> >>> >>> h1 -
>>>>>> >>> >>> engine crashes and does not start elsewhere, VM(cinder)  on
>>>>>> h3 on
>>>>>> >>> >>> same
>>>>>> >>> >>> gluster volume pauses.
>>>>>> >>> >>>
>>>>>> >>> >>> - Host 1 takes about 5 minutes to reboot (Enterprise box with
>>>>>> all
>>>>>> >>> >>> it's
>>>>>> >>> >>> normal BIOS probing)
>>>>>> >>> >>>
>>>>>> >>> >>> - Engine starts after h1 comes back and stabilises
>>>>>> >>> >>>
>>>>>> >>> >>> - VM(cinder) unpauses itself,  VM(reports) continued fine the
>>>>>> whole
>>>>>> >>> >>> time.
>>>>>> >>> >>> I can do no diagnosis on the 2 VMs as the engine is not
>>>>>> available.
>>>>>> >>> >>>
>>>>>> >>> >>> - Local maintenance removed from h1
>>>>>> >>> >>>
>>>>>> >>> >>>
>>>>>> >>> >>> I don't believe the issue is with gluster itself as the volume
>>>>>> >>> >>> remains
>>>>>> >>> >>> accessible on all hosts during this time albeit with a
>>>>>> missing server
>>>>>> >>> >>> (gluster volume status) as each gluster server is rebooted.
>>>>>> >>> >>>
>>>>>> >>> >>> Gluster was upgraded as part of the process, no issues were
>>>>>> seen
>>>>>> >>> >>> here.
>>>>>> >>> >>>
>>>>>> >>> >>>
>>>>>> >>> >>> I have been able to duplicate the issue without the upgrade by
>>>>>> >>> >>> following
>>>>>> >>> >>> the same sort of timeline.
>>>>>> >>> >>>
>>>>>> >>> >>>
>>>>>> >>> >>> ________________________________
>>>>>> >>> >>> From: Sandro Bonazzola <sbonazzo at redhat.com>
>>>>>> >>> >>> Sent: Monday, 11 April 2016 7:11 PM
>>>>>> >>> >>> To: Richard Neuboeck; Simone Tiraboschi; Roy Golan; Martin
>>>>>> Sivak;
>>>>>> >>> >>> Sahina
>>>>>> >>> >>> Bose
>>>>>> >>> >>> Cc: Bond, Darryl; users
>>>>>> >>> >>> Subject: Re: [ovirt-users] Hosted engine on gluster problem
>>>>>> >>> >>>
>>>>>> >>> >>>
>>>>>> >>> >>>
>>>>>> >>> >>> On Mon, Apr 11, 2016 at 9:37 AM, Richard Neuboeck
>>>>>> >>> >>> <hawk at tbi.univie.ac.at<mailto:hawk at tbi.univie.ac.at>> wrote:
>>>>>> >>> >>> Hi Darryl,
>>>>>> >>> >>>
>>>>>> >>> >>> I'm still experimenting with my oVirt installation so I tried
>>>>>> to
>>>>>> >>> >>> recreate the problems you've described.
>>>>>> >>> >>>
>>>>>> >>> >>> My setup has three HA hosts for virtualization and three
>>>>>> machines
>>>>>> >>> >>> for the gluster replica 3 setup.
>>>>>> >>> >>>
>>>>>> >>> >>> I manually migrated the Engine from the initial install host
>>>>>> (one)
>>>>>> >>> >>> to host three. Then shut down host one manually and
>>>>>> interrupted the
>>>>>> >>> >>> fencing mechanisms so the host stayed down. This didn't
>>>>>> bother the
>>>>>> >>> >>> Engine VM at all.
>>>>>> >>> >>>
>>>>>> >>> >>> Did you move the host one to maintenance before shutting down?
>>>>>> >>> >>> Or is this a crash recovery test?
>>>>>> >>> >>>
>>>>>> >>> >>>
>>>>>> >>> >>>
>>>>>> >>> >>> To make things a bit more challenging I then shut down host
>>>>>> three
>>>>>> >>> >>> while running the Engine VM. Of course the Engine was down
>>>>>> for some
>>>>>> >>> >>> time until host two detected the problem. It started the
>>>>>> Engine VM
>>>>>> >>> >>> and everything seems to be running quite well without the
>>>>>> initial
>>>>>> >>> >>> install host.
>>>>>> >>> >>>
>>>>>> >>> >>> Thanks for the feedback!
>>>>>> >>> >>>
>>>>>> >>> >>>
>>>>>> >>> >>>
>>>>>> >>> >>> My only problem is that the HA agent on host two and three
>>>>>> refuse to
>>>>>> >>> >>> start after a reboot due to the fact that the configuration
>>>>>> of the
>>>>>> >>> >>> hosted engine is missing. I wrote another mail to
>>>>>> >>> >>> users at ovirt.org<mailto:users at ovirt.org>
>>>>>> >>> >>> about that.
>>>>>> >>> >>>
>>>>>> >>> >>> This is weird. Martin,  Simone can you please investigate on
>>>>>> this?
>>>>>> >>> >>>
>>>>>> >>> >>>
>>>>>> >>> >>>
>>>>>> >>> >>>
>>>>>> >>> >>> Cheers
>>>>>> >>> >>> Richard
>>>>>> >>> >>>
>>>>>> >>> >>> On 04/08/2016 01:38 AM, Bond, Darryl wrote:
>>>>>> >>> >>> > There seems to be a pretty severe bug with using hosted
>>>>>> engine on
>>>>>> >>> >>> > gluster.
>>>>>> >>> >>> >
>>>>>> >>> >>> > If the host that was used as the initial hosted-engine
>>>>>> --deploy
>>>>>> >>> >>> > host
>>>>>> >>> >>> > goes away, the engine VM wil crash and cannot be restarted
>>>>>> until
>>>>>> >>> >>> > the host
>>>>>> >>> >>> > comes back.
>>>>>> >>> >>>
>>>>>> >>> >>> is this an Hyperconverged setup?
>>>>>> >>> >>>
>>>>>> >>> >>>
>>>>>> >>> >>> >
>>>>>> >>> >>> > This is regardless of which host the engine was currently
>>>>>> running.
>>>>>> >>> >>> >
>>>>>> >>> >>> >
>>>>>> >>> >>> > The issue seems to be buried in the bowels of VDSM and is
>>>>>> not an
>>>>>> >>> >>> > issue
>>>>>> >>> >>> > with gluster itself.
>>>>>> >>> >>>
>>>>>> >>> >>> Sahina, can you please investigate on this?
>>>>>> >>> >>>
>>>>>> >>> >>>
>>>>>> >>> >>> >
>>>>>> >>> >>> > The gluster filesystem is still accessable from the host
>>>>>> that was
>>>>>> >>> >>> > running the engine. The issue has been submitted to
>>>>>> bugzilla but
>>>>>> >>> >>> > the fix is
>>>>>> >>> >>> > some way off (4.1).
>>>>>> >>> >>> >
>>>>>> >>> >>> >
>>>>>> >>> >>> > Can my hosted engine be converted to use NFS (using the
>>>>>> gluster NFS
>>>>>> >>> >>> > server on the same filesystem) without rebuilding my hosted
>>>>>> engine
>>>>>> >>> >>> > (ie
>>>>>> >>> >>> > change domainType=glusterfs to domainType=nfs)?
>>>>>> >>> >>>
>>>>>> >>> >>> >
>>>>>> >>> >>> > What effect would that have on the hosted-engine storage
>>>>>> domain
>>>>>> >>> >>> > inside
>>>>>> >>> >>> > oVirt, ie would the same filesystem be mounted twice or
>>>>>> would it
>>>>>> >>> >>> > just break.
>>>>>> >>> >>> >
>>>>>> >>> >>> >
>>>>>> >>> >>> > Will this actually fix the problem, does it have the same
>>>>>> issue
>>>>>> >>> >>> > when
>>>>>> >>> >>> > the hosted engine is on NFS?
>>>>>> >>> >>> >
>>>>>> >>> >>> >
>>>>>> >>> >>> > Darryl
>>>>>> >>> >>> >
>>>>>> >>> >>> >
>>>>>> >>> >>> >
>>>>>> >>> >>> >
>>>>>> >>> >>> > ________________________________
>>>>>> >>> >>> >
>>>>>> >>> >>> > The contents of this electronic message and any attachments
>>>>>> are
>>>>>> >>> >>> > intended only for the addressee and may contain legally
>>>>>> privileged,
>>>>>> >>> >>> > personal, sensitive or confidential information. If you are
>>>>>> not the
>>>>>> >>> >>> > intended
>>>>>> >>> >>> > addressee, and have received this email, any transmission,
>>>>>> >>> >>> > distribution,
>>>>>> >>> >>> > downloading, printing or photocopying of the contents of
>>>>>> this
>>>>>> >>> >>> > message or
>>>>>> >>> >>> > attachments is strictly prohibited. Any legal privilege or
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>>>>>> >>> >>> > attached to this message and attachments is not waived,
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>>>>>> >>> >>> > you have
>>>>>> >>> >>> > received this message and are not the intended addressee
>>>>>> you should
>>>>>> >>> >>> > notify
>>>>>> >>> >>> > the sender by return email and destroy all copies of the
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>>>>>> >>> >>> > _______________________________________________
>>>>>> >>> >>> > Users mailing list
>>>>>> >>> >>> > Users at ovirt.org<mailto:Users at ovirt.org>
>>>>>> >>> >>> > http://lists.ovirt.org/mailman/listinfo/users
>>>>>> >>> >>> >
>>>>>> >>> >>>
>>>>>> >>> >>>
>>>>>> >>> >>> --
>>>>>> >>> >>> /dev/null
>>>>>> >>> >>>
>>>>>> >>> >>>
>>>>>> >>> >>> _______________________________________________
>>>>>> >>> >>> Users mailing list
>>>>>> >>> >>> Users at ovirt.org<mailto:Users at ovirt.org>
>>>>>> >>> >>> http://lists.ovirt.org/mailman/listinfo/users
>>>>>> >>> >>>
>>>>>> >>> >>>
>>>>>> >>> >>>
>>>>>> >>> >>>
>>>>>> >>> >>> --
>>>>>> >>> >>> Sandro Bonazzola
>>>>>> >>> >>> Better technology. Faster innovation. Powered by community
>>>>>> >>> >>> collaboration.
>>>>>> >>> >>> See how it works at redhat.com<http://redhat.com>
>>>>>> >>> >>
>>>>>> >>> >>
>>>>>> >>> >>
>>>>>> >>> >>
>>>>>> >>> >> --
>>>>>> >>> >> Sandro Bonazzola
>>>>>> >>> >> Better technology. Faster innovation. Powered by community
>>>>>> >>> >> collaboration.
>>>>>> >>> >> See how it works at redhat.com
>>>>>> >>> >> _______________________________________________
>>>>>> >>> >> Users mailing list
>>>>>> >>> >> Users at ovirt.org
>>>>>> >>> >> http://lists.ovirt.org/mailman/listinfo/users
>>>>>> >>> >
>>>>>> >>> >
>>>>>> >>> > _______________________________________________
>>>>>> >>> > Users mailing list
>>>>>> >>> > Users at ovirt.org
>>>>>> >>> > http://lists.ovirt.org/mailman/listinfo/users
>>>>>> >>> >
>>>>>> >>
>>>>>> >>
>>>>>> >>
>>>>>> >>
>>>>>> >> --
>>>>>> >> Sandro Bonazzola
>>>>>> >> Better technology. Faster innovation. Powered by community
>>>>>> collaboration.
>>>>>> >> See how it works at redhat.com
>>>>>> >
>>>>>> >
>>>>>>
>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> Sandro Bonazzola
>>>>> Better technology. Faster innovation. Powered by community
>>>>> collaboration.
>>>>> See how it works at redhat.com
>>>>>
>>>>
>>>> _______________________________________________
>>>> Users mailing list
>>>> Users at ovirt.org
>>>> http://lists.ovirt.org/mailman/listinfo/users
>>>>
>>>>
>>>
>>
>>
>> --
>> Sandro Bonazzola
>> Better technology. Faster innovation. Powered by community collaboration.
>> See how it works at redhat.com
>>
>
>
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