HP Serviceguard manual Managing the Cluster and Nodes, Setting up Periodic Cluster Verification

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.

Limitations

Serviceguard does not check the following conditions:

•Access Control Policies properly configured (see “Controlling Access to the Cluster” (page 192) for information about Access Control Policies)

•File systems configured to mount automatically on boot (that is, Serviceguard does not check

/etc/fstab)

•Shared volume groups configured to activate on boot

•Volume group major and minor numbers unique

•Redundant storage paths functioning properly

•Kernel parameters and driver configurations consistent across nodes

•Mount point overlaps (such that one file system is obscured when another is mounted)

•Unreachable DNS server

•Consistency of settings in .rhosts and /var/admin/inetd.sec

•Consistency across cluster of major and minor numbers device-file numbers

•Nested mount points

•Staleness of mirror copies

Managing the Cluster and Nodes

This section covers the following tasks:

•Starting the Cluster When All Nodes are Down

•Adding Previously Configured Nodes to a Running Cluster

•Removing Nodes from Operation in a Running Cluster

Managing the Cluster and Nodes 277