[ClusterLabs] Antw: [EXT] Re: Upgrading/downgrading cluster configuration

[Ulrich Windl]

>>> Strahil Nikolov <hunter86_bg at yahoo.com> schrieb am 23.10.2020 um 17:04 in
Nachricht <362944335.2019534.1603465466854 at mail.yahoo.com>:
> Usually I prefer to use "crm configure show" and later "crm configure edit"

> and replace the config.

I guess you use "edit" because of the lack of support for massive
configuration changes (like "replace all timeouts for... with ..."), right?

> 
> I am not sure if this will work with such downgrade scenario, but it 
> shouldn't be a problem.
> 
> Best Regards,
> Strahil Nikolov
> 
> 
> 
> 
> 
> 
> В четвъртък, 22 октомври 2020 г., 21:30:55 Гринуич+3, Vitaly Zolotusky 
> <vitaly at unitc.com> написа: 
> 
> 
> 
> 
> 
> Thanks for the reply.
> I do see backup config command in pcs, but not in crmsh. 
> What would that be in crmsh? Would something like this work after Corosync 
> started in the state with all resources inactive? I'll try this: 
> 
> crm configure save <FILE>
> crm configure load <FILE>
> 
> Thank you!
> _Vitaly Zolotusky
> 
>> On October 22, 2020 1:54 PM Strahil Nikolov <hunter86_bg at yahoo.com> wrote:
>> 
>>  
>> Have you tried to backup the config via crmsh/pcs and when you downgrade to

> restore from it ?
>> 
>> Best Regards,
>> Strahil Nikolov
>> 
>> 
>> 
>> 
>> 
>> 
>> В четвъртък, 22 октомври 2020 г., 15:40:43 Гринуич+3, Vitaly Zolotusky 
> <vitaly at unitc.com> написа: 
>> 
>> 
>> 
>> 
>> 
>> Hello,
>> We are trying to upgrade our product from Corosync 2.X to Corosync 3.X. Our

> procedure includes upgrade where we stopthe cluster, replace rpms and
restart 
> the cluster. Upgrade works fine, but we also need to implement rollback in 
> case something goes wrong. 
>> When we rollback and reload old RPMs cluster says that there are no active

> resources. It looks like there is a problem with cluster configuration 
> version.
>> Here is output of the crm_mon:
>> ************
>> d21-22-left.lab.archivas.com /opt/rhino/sil/bin # crm_mon -A1
>> Stack: corosync
>> Current DC: NONE
>> Last updated: Thu Oct 22 12:39:37 2020
>> Last change: Thu Oct 22 12:04:49 2020 by root via crm_attribute on 
> d21-22-left.lab.archivas.com
>> 
>> 2 nodes configured
>> 15 resources configured
>> 
>> Node d21-22-left.lab.archivas.com: UNCLEAN (offline)
>> Node d21-22-right.lab.archivas.com: UNCLEAN (offline)
>> 
>> No active resources
>> 
>> 
>> Node Attributes:
>> 
>> ***********
>> What would be the best way to implement downgrade of the configuration? 
> Should we just change crm feature set, or we need to rebuild the whole 
> config?
>> Thanks!
>> _Vitaly Zolotusky
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