[ClusterLabs] Beginner with STONITH Problem

[Strahil Nikolov]

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 .
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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