[ovirt-users] MoM is failing!!!

Mon Oct 16 13:59:30 UTC 2017

Hi,

The issue is the following, after installation of ovirt 4.1 on three 
nodes with glusterFS as a storage, oVirt engine reported the failed 
events, with the following message

*VDSM hostname command GetStatsVDS failed: Connection reset by peer*

after that oVirt was trying to fence the affected host and it was 
excluded from production, luckily I am not running any VMs on it yet.

The**logs are attached, don't be surprised with the hostnames :)

Thanks in advance

Cheers

Erekle

On 10/16/2017 03:37 PM, Dafna Ron wrote:
> Hi,
>
> Can you please tell us what is the issue that you are actually facing? 
> :) it would be easier to debug an issue and not an error message that 
> can be cause by several things.
>
> Also, can you provide the engine and the vdsm logs?
>
> thank you,
> Dafna
>
>
> On 10/16/2017 02:30 PM, Erekle Magradze wrote:
>>
>> It's was a typo in the failure message,
>>
>> that's what I was getting:
>>
>> *VDSM hostname command GetStatsVDS failed: Connection reset by peer*
>>
>>
>> On 10/16/2017 03:21 PM, Erekle Magradze wrote:
>>>
>>> Hi,
>>>
>>> It's getting clear now, indeed momd service is disabled
>>>
>>> ● momd.service - Memory Overcommitment Manager Daemon
>>>    Loaded: loaded (/usr/lib/systemd/system/momd.service; static; 
>>> vendor preset: disabled)
>>>    Active: inactive (dead)
>>>
>>> mom-vdsm is enable and running.
>>>
>>> ● mom-vdsm.service - MOM instance configured for VDSM purposes
>>>    Loaded: loaded (/usr/lib/systemd/system/mom-vdsm.service; 
>>> enabled; vendor preset: enabled)
>>>    Active: active (running) since Mon 2017-10-16 15:14:35 CEST; 1min 
>>> 3s ago
>>>  Main PID: 27638 (python)
>>>    CGroup: /system.slice/mom-vdsm.service
>>>            └─27638 python /usr/sbin/momd -c /etc/vdsm/mom.conf
>>>
>>> The reason why I came up with digging in mom problems is the 
>>> following problem
>>>
>>>
>>> *VDSM hostname command GetStatsVDSThanks failed: Connection reset by 
>>> peer*
>>>
>>> that is causing fencing of the node where the failure is happening, 
>>> what could be the reason of GetStatsVDS failure?
>>>
>>> Best Regards
>>> Erekle
>>>
>>>
>>> On 10/16/2017 03:11 PM, Martin Sivak wrote:
>>>> Hi,
>>>>
>>>> how do you start MOM? MOM is supposed to talk to vdsm, we do not talk
>>>> to libvirt directly. The line you posted comes from vdsm and vdsm is
>>>> telling you it can't talk to MOM.
>>>>
>>>> Which MOM service is enabled? Because there are two momd and mom-vdsm,
>>>> the second one is the one that should be enabled.
>>>>
>>>> Best regards
>>>>
>>>> Martin Sivak
>>>>
>>>>
>>>> On Mon, Oct 16, 2017 at 3:04 PM, Erekle Magradze
>>>> <erekle.magradze at recogizer.de>  wrote:
>>>>> Hi Martin,
>>>>>
>>>>> Thanks for the answer, unfortunately this warning message persists, does it
>>>>> mean that mom cannot communicate with libvirt? how critical is it?
>>>>>
>>>>> Best
>>>>>
>>>>> Erekle
>>>>>
>>>>>
>>>>>
>>>>> On 10/16/2017 03:03 PM, Martin Sivak wrote:
>>>>>> Hi,
>>>>>>
>>>>>> it is just a warning, there is nothing you have to solve unless it
>>>>>> does not resolve itself within a minute or so. If it happens only once
>>>>>> or twice after vdsm or mom restart then you are fine.
>>>>>>
>>>>>> Best regards
>>>>>>
>>>>>> --
>>>>>> Martin Sivak
>>>>>> SLA / oVirt
>>>>>>
>>>>>> On Mon, Oct 16, 2017 at 2:44 PM, Erekle Magradze
>>>>>> <erekle.magradze at recogizer.de>  wrote:
>>>>>>> Hi,
>>>>>>>
>>>>>>> after running
>>>>>>>
>>>>>>> systemctl status vdsm I am getting that it's running and this message at
>>>>>>> the
>>>>>>> end.
>>>>>>>
>>>>>>> Oct 16 14:26:52 hostname vdsmd[2392]: vdsm throttled WARN MOM not
>>>>>>> available.
>>>>>>> Oct 16 14:26:52 hostname vdsmd[2392]: vdsm throttled WARN MOM not
>>>>>>> available,
>>>>>>> KSM stats will be missing.
>>>>>>> Oct 16 14:26:57 hostname vdsmd[2392]: vdsm root WARN ping was deprecated
>>>>>>> in
>>>>>>> favor of ping2 and confirmConnectivity
>>>>>>>
>>>>>>> how critical it is? and how to solve that warning?
>>>>>>>
>>>>>>> I am using libvirt
>>>>>>>
>>>>>>> Cheers
>>>>>>>
>>>>>>> _______________________________________________
>>>>>>> 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
>>
>> -- 
>> Recogizer Group GmbH
>>
>> Dr.rer.nat. Erekle Magradze
>> Lead Big Data Engineering & DevOps
>> Rheinwerkallee 2, 53227 Bonn
>> Tel: +49 228 29974555
>>
>> E-Mailerekle.magradze at recogizer.de
>> Web:www.recogizer.com
>>   
>> Recogizer auf LinkedInhttps://www.linkedin.com/company-beta/10039182/
>> Folgen Sie uns auf Twitterhttps://twitter.com/recogizer
>>   
>> -----------------------------------------------------------------
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>> Geschäftsführer: Oliver Habisch, Carsten Kreutze
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>
>

-- 
Recogizer Group GmbH

Dr.rer.nat. Erekle Magradze
Lead Big Data Engineering & DevOps
Rheinwerkallee 2, 53227 Bonn
Tel: +49 228 29974555

E-Mail erekle.magradze at recogizer.de
Web: www.recogizer.com

Recogizer auf LinkedIn https://www.linkedin.com/company-beta/10039182/
Folgen Sie uns auf Twitter https://twitter.com/recogizer

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Geschäftsführer: Oliver Habisch, Carsten Kreutze
Handelsregister: Amtsgericht Bonn HRB 20724
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Diese E-Mail enthält vertrauliche und/oder rechtlich geschützte Informationen.
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