HP Serviceguard Extension for RAC (SGeRAC) Setting up Periodic Cluster Verification, Example

Table 5 Verifying Cluster Components (continued)

Component (Context)	Tool or Command; More Information	Comments
		exist and are executable. Service
		commands whose paths are nested
		within an unmounted shared
		filesystem are not checked.
IP addresses (cluster)	cmcheckconf (1m), cmapplyconf	Commands check that all IP
	(1m)	addresses configured into the
		cluster are in each node's /etc/
		hosts.
Package IP addresses (package)	cmcheckconf (1m), cmapplyconf
	(1m)
File systems (package)	cmcheckconf (1m), cmapplyconf	For LVM only, commands check
	(1m)	that file systems have been built on
		the logical volumes identified by
		the fs_name parameter.
EMS resources (package)	cmcheckconf (1m), cmapplyconf	Commands check that configured
	(1m)	resources are available on each
		node that can run the package.
External scripts and pre-scripts	cmcheckconf (1m), cmapplyconf	A non-zero return value from any
(modular package)	(1m)	script will cause the commands to
		fail.
SGeRAC Toolkit files consistency	cmcheckconf (1m), cmapplyconf	Checked for modular packages
(package)	(1m)	only, as part of package validation
		(cmcheckconf -P).
Cluster Interconnect subnet (package)	cmcheckconf (1m), cmapplyconf	Checked for modular packages
	(1m)	only, as part of package validation
		(cmcheckconf -P).

Setting up Periodic Cluster Verification

You can use cron (1m) to run cluster verification at a fixed interval. Specify the commands to run in a crontab file (see crontab (1)).

NOTE: The job must run on one of the nodes in the cluster. Because only the root user can run cluster verification, and cron (1m) sets the job’s user and group ID’s to those of the user who submitted the job, you must edit the file /var/spool/cron/crontabs/root as the root user.

Example

The short script that follows runs cluster verification and sends an email to admin@hp.com when verification fails.

#!/bin/sh

cmcheckconf -v >/tmp/cmcheckconf.output if (( $? != 0 ))

then

mailx -s "Cluster verification failed" admin@hp.com 2>&1 </tmp/cmcheckconf.output

fi

To run this script from cron, you would create the following entry in /var/spool/cron/ crontabs/root:

0 8,20 * * * verification.sh

See the cron (1m) manpage for more information.

Checking the Cluster Configuration and Components 125