[Pacemaker] Query regarding a Trigger when a node gets online in cluster

Dharmesh cutedharmesh at gmail.com
Sun Aug 3 23:40:50 EDT 2014


I am trying to implement following Scenario :-

i am having a 2 node cluster. Both the nodes are having PostgreSQL as
Database & database replication is on from primary PostgreSQL node to
secondary PostgreSQL node.

Test Scenario :-

In case my Primary node goes down (Powered off or network failure) then i
need to promote the PostgreSQL on secondary to act as Master. This thing is
achieved easily by creating a resource agent and executing PostgreSQL
promote command inside that resource agent. but the problem is that i need
to make PostgreSQL on other node(which is down now) as Standby so that
replication can begin from master to standby. For this purpose i need to
take the base backup of new primary PostgreSQL and put it on to the other
node when that node comes up.

Since i don't have any trigger which will let me know that the other node
is up now so how will PostgreSQL on other node be configured as standby for
this new master.


On Sat, Aug 2, 2014 at 6:53 AM, Andrew Beekhof <andrew at beekhof.net> wrote:

> On 1 Aug 2014, at 8:18 pm, Dharmesh <cutedharmesh at gmail.com> wrote:
> > Hi,
> >
> > I am stuck with a problem in my cluster setup.
> > I am having a 2 node Pacemaker/Heartbeat cluster. My requirement is to
> execute a shell script from the currently online node to the other node
> (via ssh) when it gets online in cluster. Is there any trigger that lets me
> know that other node in cluster is online ??
> Not directly. What are you trying to achieve?
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Dharmesh Kumar
Research Engineer
Center for Development of Telematics
Mehrauli, New Delhi-110 030
(M) : +91-8130535993
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