[ClusterLabs] CCIB migration from Pacemaker 1.x to 2.x

[damiano giuliani]

Hi jaikumar,
Ilo/sbd fencing should provide node reboot in case of network split. Is
your node properly fenced?
Anyway if your cluster is managing a db services like postgres as
replication throught wal log when a failover occurs you MUST resync or
pg_rewind in order to guarantee the cosistency. Pacemaker for postgres
doesnt supoort(as far i know) any kind of autohealing of the "new" slave.

Hope it helps

Damiano


On Sat, 30 Jan 2021, 13:41 Sharma, Jaikumar, <jaikumar-sharma at outlook.com>
wrote:

>
> > fence_drac5 , fence_drac (not sure about that) , SBD
> I've configured IPMI over LAN giving static IP addresses to both nodes (at
> iDRAC level) in cluster and I can power reset/reboot both nodes in the
> cluster by sending commands from OS using ipmitool, but not sure how
> fencing is going to work if one node out of two has network cable plugged
> out? Since it is out of the cluster, not possible to reboot it as it is
> already out of the cluster and without network connectivity.
>
> Reason to implement fencing (as this thread started with) is that in two
> node cluster (master/slave), one node losing network connectivity (because
> of pulling out the network cable of master node) and slave will become new
> master and provide the necessary services , but as soon as I plug-in the
> cable back to the node race of joining this node as master starts while
> there is already a master and database sync issue occur between the two
> nodes.
>
> How will fencing (node or resource ?) will help in this case?
>
> OR
>
> As soon as other node joins the cluster it does not come into race of
> becoming master but just join the cluster as a slave.
>
> Any further pointers will be appreciated,
>
> Thank you.
>
> Regards,
> Jaikumar
>
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> On Mon, Jan 25, 2021 at 11:23, Sharma, Jaikumar
> <jaikumar-sharma at outlook.com> wrote:
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