[Pacemaker] Notification when a node is down

[Ken Gaillot]

On 09/12/2014 02:30 AM, Sihan Goi wrote:
> Is there any way for a Pacemaker/Corosync/PCS setup to send a
> notification when it detects that a node in a cluster is down? I read
> that Pacemaker and Corosync logs events to syslog, but where is the
> syslog file in CentOS? Do they log events such as a failover occurrence?

Pacemaker/corosync do extensive logging, even more so if debug is set to 
on in corosync.conf. Syslog is configurable to log the messages however 
you want; the default file locations vary from OS to OS.

Monitoring and notification are usually handled by a dedicated package 
for that purpose, such as nagios, icinga, monit or zabbix. These 
packages can monitor services on the nodes directly, as well as the 
health of pacemaker itself. Here, we use icinga with Phil Garner's 
check_crm plugin:

https://www.icinga.org/

https://github.com/dnsmichi/icinga-plugins/blob/master/scripts/check_crm

-- Ken Gaillot <kjgaillo at gleim.com>
Network Operations Center, Gleim Publications