[ClusterLabs] Beginner with STONITH Problem

[stefan.schmitz at farmpartner-tec.com]

Hello and thank you both for the help,

 >> Are the VMs in the same VLAN like the hosts?
Yes the VMs and Hosts are all in the same VLan. So I will try the 
fence_xvm solution.

 > https://wiki.clusterlabs.org/wiki/Guest_Fencing
Thank you for the pointer to that walk-through. Sadly every VM is on its 
own host which is marked as "Not yet supported" but still this how to is 
a good starting point and I will try to work and tweak my way through it 
for out setup.

Thanks again!

Kind regards
Stefan Schmitz

Am 24.06.2020 um 15:51 schrieb Ken Gaillot:
> On Wed, 2020-06-24 at 15:47 +0300, Strahil Nikolov wrote:
>> Hello Stefan,
>>
>> There are multiple options for stonith, but it depends on the
>> environment.
>> Are the VMs in the same VLAN like the hosts? I am asking this , as
>> the most popular candidate is 'fence_xvm' but it requires the VM to
>> send fencing request to the KVM host (multicast) where the partner VM
>> is hosted .
> 
> FYI a fence_xvm walk-through for the simple case is available on the
> ClusterLabs wiki:
> 
> https://wiki.clusterlabs.org/wiki/Guest_Fencing
> 
>> Another approach is to use a shared disk (either over iSCSI or
>> SAN)  and use sbd for power-based fencing,  or  use SCSI3 Persistent
>> Reservations (which can also be converted into a power-based
>> fencing).
>>
>>
>> Best Regards,
>> Strahil Nikolov
>>
>>
>> На 24 юни 2020 г. 13:44:27 GMT+03:00, "
>> stefan.schmitz at farmpartner-tec.com" <
>> stefan.schmitz at farmpartner-tec.com> написа:
>>> Hello,
>>>
>>> I am an absolute beginner trying to setup our first HA Cluster.
>>> So far I have been working with the "Pacemaker 1.1 Clusters from
>>> Scratch" Guide wich worked for me perfectly up to the Point where I
>>> need
>>> to install and configure STONITH.
>>>
>>> Curerent Situation is:2 Ubuntu Server as the cluster. Both of
>>> those
>>> Servers are virtual machines running on 2 Centos KVM Hosts.
>>> Those are the devices or ressources we can use for a STONITH
>>> implementation. In this and other guides I do read a lot about
>>> external
>>>
>>> devices and in the "pcs stonith list" there are some XEN but sadly
>>> I
>>> cannot find anything about KVM. At this point I am stumped and have
>>> no
>>> clue in how to proceed, I am not even sure what further inforamtion
>>> I
>>> shopuld provide that would be useful for giving advise?
>>>
>>> The current pcs status is:
>>>
>>> # pcs status
>>> Cluster name: pacemaker_cluster
>>> WARNING: corosync and pacemaker node names do not match (IPs used
>>> in
>>> setup?)
>>> Stack: corosync
>>> Current DC: server2ubuntu1 (version 1.1.18-2b07d5c5a9) - partition
>>> with
>>>
>>> quorum
>>> Last updated: Wed Jun 24 12:43:24 2020
>>> Last change: Wed Jun 24 12:35:17 2020 by root via cibadmin on
>>> server4ubuntu1
>>>
>>> 2 nodes configured
>>> 12 resources configured
>>>
>>> Online: [ server2ubuntu1 server4ubuntu1 ]
>>>
>>> Full list of resources:
>>>
>>>   Master/Slave Set: r0_pacemaker_Clone [r0_pacemaker]
>>>       Masters: [ server4ubuntu1 ]
>>>       Slaves: [ server2ubuntu1 ]
>>>   Clone Set: dlm-clone [dlm]
>>>       Stopped: [ server2ubuntu1 server4ubuntu1 ]
>>>   Clone Set: ClusterIP-clone [ClusterIP] (unique)
>>>       ClusterIP:0        (ocf::heartbeat:IPaddr2):       Started
>>> server4ubuntu1
>>>       ClusterIP:1        (ocf::heartbeat:IPaddr2):       Started
>>> server4ubuntu1
>>>   Master/Slave Set: WebDataClone [WebData]
>>>       Masters: [ server2ubuntu1 server4ubuntu1 ]
>>>   Clone Set: WebFS-clone [WebFS]
>>>       Stopped: [ server2ubuntu1 server4ubuntu1 ]
>>>   Clone Set: WebSite-clone [WebSite]
>>>       Stopped: [ server2ubuntu1 server4ubuntu1 ]
>>>
>>> Failed Actions:
>>> * dlm_start_0 on server2ubuntu1 'not configured' (6): call=437,
>>> status=complete, exitreason='',
>>>      last-rc-change='Wed Jun 24 12:35:30 2020', queued=0ms,
>>> exec=86ms
>>> * r0_pacemaker_monitor_60000 on server2ubuntu1 'master' (8):
>>> call=438,
>>> status=complete, exitreason='',
>>>      last-rc-change='Wed Jun 24 12:36:30 2020', queued=0ms, exec=0ms
>>> * dlm_start_0 on server4ubuntu1 'not configured' (6): call=441,
>>> status=complete, exitreason='',
>>>      last-rc-change='Wed Jun 24 12:35:30 2020', queued=0ms,
>>> exec=74ms
>>>
>>>
>>> Daemon Status:
>>>    corosync: active/disabled
>>>    pacemaker: active/disabled
>>>    pcsd: active/enabled
>>>
>>>
>>>
>>> I have researched the shown dlm Problem but everything I have found
>>> says
>>> that configuring STONITH would solve that issue.
>>> Could please someone advise on how to proceed?
>>>
>>> Thank you in advance!
>>>
>>> Kind regards
>>> Stefan Schmitz
>>>
>>>
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