Operator Alerts: Audible Alarm

To cause an alarm to sound when the backup server has to take over for the primary server, use a haresources entry like this:

 primarynode AudibleAlarm::primarynode 

This entry says that the host named primarynode should normally "own" the resource AudibleAlarm, but that the AudibleAlarm should never sound on the primary server. The AudibleAlarm resource, or script, allows you to specify a list of host names that should never sound an alarm. In this case, we are telling the AudibleAlarm script not to run or sound on the primarynode. When a failover occurs, Heartbeat running on the backup server will sound the alarm (an audible beep every one second).

Note 

These haresources entries rely on the scripts /etc/ha.d/resource.d/AudibleAlarm and / etc/ha.d/resource.d/MailTo. These scripts are located in the chapter8 subdirectory on the CD-ROM. You can also download them from the Linux-ha CVS repository (see the heartbeat/resource.d directory for additional scripts).

The AudibleAlarm script can also be modified to flash the floppy drive light if you have installed the fdutils packages. The fdutils package contains a utility called floppycontrol. You can easily download and compile the fdutils package (download the tar file from http://fdutils.linux.lu, then run ./configure, then make) and uncomment the lines in the /etc/ha.d/ resource.d/AudibleAlarm script to make the floppy drive light flash.