[ClusterLabs] Antw: Re: Antw: why is node fenced ?

[Ulrich Windl]

>>> "Lentes, Bernd" <bernd.lentes at helmholtz-muenchen.de> schrieb am 13.08.2019
um
10:54 in Nachricht
<848962511.1856599.1565686469666.JavaMail.zimbra at helmholtz-muenchen.de>:

> 
> ‑‑‑‑‑ On Aug 13, 2019, at 9:00 AM, Ulrich Windl
Ulrich.Windl at rz.uni‑regensburg.de 
> wrote:
> 
>> Personally I feel more save with updates when the whole cluster node is
>> offline, not standby. When you are going to boot anyway, it won't make much

> of
>> a difference. Also you don't have to remember to put the node back online
in
>> the configuration.
> 
> OK.
>  
>> For your case: After Rebooting the first node, the second one was DC. If
you
>> reboot that, the first node becomes DC, but when booting node 2 it still 
> have
>> the old config saying it it the DC. So both nodes have to agree on that. 
> Maybe
>> that's why the cluster is "unclean" for a while. Did it "go away" after
some
>> time?
> 
> For debugging, e.g. after fencing: is there something in the logs form
where
> i recognize which one was DC and which not ? E.g. some differences in the 
> pacemaker.log ?

In SLES12 it's in /var/log/pacemaker.log: Look for strings like "Set DC to "
and "Unset DC. Was ", or "I_ELECTION_DC" and "I_NOT_DC".

> 
> What is about changes of the CIB and the following actions ? If after a diff

> in the CIB pengine is doing s.th.,
> this must be the DC i guess.

Correct.

> 
> 
> Bernd
>  
> 
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