Configure Failover Notification

Describes when and how to set up an email sent out when a SMW HA failover occurs.

Failover notification requires email to be configured on both SMWs. For information about configuring email, see http://www.postfix.org/BASIC_CONFIGURATION_README.html.

The SMW HA software includes a Notification resource that automatically sends email when a failover occurs.

The failover notification can be configured either during initial installation or after the HA system is installed and running.

Execute the crm resource command.
```
smw1# crm resource param Notification set email address@thedomain.com 
```
Only one email address is allowed. To send notifications to multiple addresses, create a group email alias that includes these email addresses.

Verify the setting.

smw1# crm resource param Notification show email
address@thedomain.com

If a failover occurs, the Notification resource sends several messages that are similar to the following examples.

From: root [mailto:root@smw.none] 
Sent: Thursday, June 06, 2013 9:20 PM
To: Cray Cluster Administrator
Subject: ***Alert*** A Failover may have occurred. Please investigate! Migrating resource 
away at Thu Jun 6 21:20:25 CDT 2013 from smw1

        ***Alert*** A Failover may have occurred. Please investigate! Migrating resource away 
                    at Thu Jun  6 21:20:25 CDT 2013 from smw1
 
        Command line was:
        /usr/lib/ocf/resource.d//heartbeat/MailTo stop
From: root [mailto:root@smw.none] 
Sent: Thursday, June 06, 2013 9:20 PM
To: Cray Cluster Administrator
Subject: ***Alert*** A Failover may have occurred. Please investigate! Takeover in progress 
at Thu Jun 6 21:20:25 CDT 2013 on smw2

        ***Alert*** A Failover may have occurred. Please investigate! Takeover in progress 
                    at Thu Jun  6 21:20:25 CDT 2013 on smw2
 
        Command line was:
        /usr/lib/ocf/resource.d//heartbeat/MailTo start