[ClusterLabs] Antw: Re: VirtualDomain started in two hosts

[Souvignier, Daniel]

Hi,

if you have a cluster between VMs, please note that it may be problematic to
use multicast (which is the default after setting up the cluster with pcs
cluster setup), instead use unicast. That was what I ran into initially.

Regards,
Daniel



--
Daniel Souvignier

IT Center
Gruppe: Linux-basierte Anwendungen
Abteilung: Systeme und Betrieb
RWTH Aachen University
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52074 Aachen
Tel.: +49 241 80-29267
souvignier at itc.rwth-aachen.de
www.itc.rwth-aachen.de


-----Ursprüngliche Nachricht-----
Von: Ulrich Windl [mailto:Ulrich.Windl at rz.uni-regensburg.de] 
Gesendet: Dienstag, 17. Januar 2017 15:53
An: users at clusterlabs.org
Betreff: [ClusterLabs] Antw: Re: VirtualDomain started in two hosts

>>> Oscar Segarra <oscar.segarra at gmail.com> schrieb am 17.01.2017 um 
>>> 10:15 in
Nachricht
<CAJq8taG8VhX5J1xQpqMRQ-9omFNXKHQs54mBzz491_6df9akzA at mail.gmail.com>:
> Hi,
> 
> Yes, I will try to explain myself better.
> 
> *Initially*
> On node1 (vdicnode01-priv)
>>virsh list
> ==============
> vdicdb01     started
> 
> On node2 (vdicnode02-priv)
>>virsh list
> ==============
> vdicdb02     started
> 
> --> Now, I execute the migrate command (outside the cluster <-- not 
> --> using
> pcs resource move)
> virsh migrate --live vdicdb01 qemu:/// qemu+ssh://vdicnode02-priv 
> tcp://vdicnode02-priv

One of the rules of successful clustering is: If resurces are managed by the
cluster, they are managed by the cluster only! ;-)

I guess one node is trying to restart the VM once it vanished, and the other
node might try to shut down the VM while it's being migrated.
Or any other undesired combination...

> 
> *Finally*
> On node1 (vdicnode01-priv)
>>virsh list
> ==============
> *vdicdb01     started*
> 
> On node2 (vdicnode02-priv)
>>virsh list
> ==============
> vdicdb02     started
> vdicdb01     started
> 
> If I query cluster pcs status, cluster thinks resource vm-vdicdb01 is 
> only started on node vdicnode01-priv.
> 
> Thanks a lot.
> 
> 
> 
> 2017-01-17 10:03 GMT+01:00 emmanuel segura <emi2fast at gmail.com>:
> 
>> sorry,
>>
>> But do you mean, when you say, you migrated the vm outside of the 
>> cluster? one server out side of you cluster?
>>
>> 2017-01-17 9:27 GMT+01:00 Oscar Segarra <oscar.segarra at gmail.com>:
>> > Hi,
>> >
>> > I have configured a two node cluster whewe run 4 kvm guests on.
>> >
>> > The hosts are:
>> > vdicnode01
>> > vdicnode02
>> >
>> > And I have created a dedicated network card for cluster management. 
>> > I
>> have
>> > created required entries in /etc/hosts:
>> > vdicnode01-priv
>> > vdicnode02-priv
>> >
>> > The four guests have collocation rules in order to make them 
>> > distribute proportionally between my two nodes.
>> >
>> > The problem I have is that if I migrate a guest outside the 
>> > cluster, I
>> mean
>> > using the virsh migrate - - live...  Cluster,  instead of moving 
>> > back the guest to its original node (following collocation sets),  
>> > Cluster starts again the guest and suddenly I have the same guest 
>> > running on both nodes causing xfs corruption in guest.
>> >
>> > Is there any configuration applicable to avoid this unwanted behavior?
>> >
>> > Thanks a lot
>> >
>> > _______________________________________________
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>> > http://lists.clusterlabs.org/mailman/listinfo/users
>> >
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>> >
>>
>>
>>
>> --
>>   .~.
>>   /V\
>>  //  \\
>> /(   )\
>> ^`~'^
>>
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>>
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