[ClusterLabs] Loss of quoram not detected. corosync 1.4.8 , pacemaker 1.1.14. CentOS 6

[Digimer]

Neither option is feasible. There are compatibility issues with corosync
v2 on EL6, and adapting corosync v1 to be a quorum provider is basically
recreate corosync v2.

The pcs tool makes the overhead of adding cman to the mix go away, and
it's part of why it was created in the first place. Use it, and you can
pretend cman doesn't exist for all intent and purpose.

If that's not good enough, switch to EL7 where it's pure pacemaker and
corosync v2.

digimer

On 13/04/17 06:18 PM, neeraj ch wrote:
> I have dreaded that answer. Maybe I can fix vote quorum on corosync 1.4.
> Or maybe I can get 2.X working on EL6.  Really don't wanna deal with
> another layer. 
> 
> Thanks. 
> 
> 
> On Thu, Apr 13, 2017 at 2:10 PM, Digimer <lists at alteeve.ca
> <mailto:lists at alteeve.ca>> wrote:
> 
>     On 13/04/17 05:07 PM, neeraj ch wrote:
>     > Hi,
>     >
>     > I have three node cluster set up. My corosync config is as follows.
>     >
>     > compatibility: whitetank
>     > totem {
>     >     version: 2
>     >     secauth: on
>     >     threads: 0
>     >     interface {
>     >     member{
>     >         memberaddr: ip
>     >         }
>     >     member{
>     >         memberaddr:ip
>     >          }
>     >     member{
>     >         memberaddr:ip
>     >         }
>     >     bindnetaddr:172.31.31.12
>     >     ringnumber: 0
>     >     mcastport: 5405
>     >     ttl: 1
>     >     }
>     >     transport: udpu
>     > }
>     > logging {
>     >     fileline: off
>     >     to_stderr:yes
>     >     to_logfile: yes
>     >     to_syslog:yes
>     >     logfile:/var/log/cluster/corosync.log
>     >     debug:off
>     >     timestamp: on
>     >     logger_subsys {
>     >     subsys: AMF
>     >     debug:off
>     >     }
>     > }
>     > service {
>     >     name: pacemaker
>     >     ver: 1
>     > }
>     > amf {
>     >     mode: disabled
>     > }
>     >
>     >
>     >
>     > I went on to partition the master, the rest of the cluster considered
>     > the master down and elected a new master.
>     >
>     > But the corosync on the partitoned node didnt realize loss of
>     quoram and
>     > consequently pacemaker didnt shut down the resources. Giving me a
>     > multi-master scenario.
>     >
>     > I have tried adding , quorum tool as votequoram and it seems to
>     give the
>     > same result.
>     >
>     > Why isn't corosync not detecting this scenario ? any ideas.
>     >
>     > I used IP tables to block all UDP traffic in and out of the node . I
>     > didn't block traffic on lo.
>     >
>     > any help would be appreciated.
> 
>     On EL6, cman is the quorum provider. You need to have a skeleton
>     cluster.conf setup with it's fencing passed over to pacemaker via
>     fence_pcmk.
> 
>     It you use pcs/pcsd, it will configure everything for you. Do NOT
>     configure corosync directly; You need to configure it inside cman
>     itself. Reset corosync.conf back to defaults.
> 
>     Reference;
> 
>     http://clusterlabs.org/doc/en-US/Pacemaker/1.1-plugin/html-single/Clusters_from_Scratch/index.html
>     <http://clusterlabs.org/doc/en-US/Pacemaker/1.1-plugin/html-single/Clusters_from_Scratch/index.html>
> 
>     --
>     Digimer
>     Papers and Projects: https://alteeve.com/w/
>     "I am, somehow, less interested in the weight and convolutions of
>     Einstein’s brain than in the near certainty that people of equal talent
>     have lived and died in cotton fields and sweatshops." - Stephen Jay
>     Gould
> 
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-- 
Digimer
Papers and Projects: https://alteeve.com/w/
"I am, somehow, less interested in the weight and convolutions of
Einstein’s brain than in the near certainty that people of equal talent
have lived and died in cotton fields and sweatshops." - Stephen Jay Gould