HP XC System Software Administration Guide Version 3.2

• “Changing Sensor Thresholds” (page 117)
• “Adjusting the Time Allotted for Metrics Collection” (page 118)
• “Changing the Default Nagios User Name” (page 118)
• “Disabling Individual Nagios Plug-Ins” (page 120)
8.3.1 Stopping and Restarting Nagios
Nagios can record a multitude of alerts on large systems when many nodes undergo known
maintenance operations. These operations can include restarting or shutting down the HP XC
system.
To avoid these alerts, shut down Nagios on the head node immediately before these maintenance
operations with the following command:
# pdsh -a "service nagios stop"
To restart Nagios after a maintenance operation, use the following command:
# pdsh -a "service nagios start"
To restart Nagios after changing its configuration, use the following command:
# pdsh -a "service nagios restart"
Improved Availability Is in Effect
If improved availability is in effect, you must restart the nagios service (that is, the Nagios
master) using the system's availability tool. Following is an example of how to restart the nagios
service using HP Serviceguard. This example restarts the Nagios master, which is running on
node n128.
1. Run the /usr/local/cmcluster/bin/cmviewcl command to determine which node
the Nagios master is running on:
# /usr/local/cmcluster/bin/cmviewcl | grep nagios
nagios.n128 up running enabled n128
2. • Stop Nagios using this Serviceguard command:
# /usr/local/cmcluster/bin/cmhaltpkg nagios.n128
• Restart Nagios using the following Serviceguard commands:
# /usr/local/cmcluster/bin/cmhaltpkg nagios.n128
# /usr/local/cmcluster/bin/cmrunpkg -n n128 nagios.n128
# /usr/local/cmcluster/bin/cmmodpkg -e nagios.n128
8.3.2 Updating the Nagios Configuration
Most of the following sections provide you with information on which template files to update
to accomplish a given task. The nagios_vars.ini file contains most of the parameters that
define the Nagios configuration. Editing this file is key for most of the configuration updates
you want to perform. The HP XC System Software also features Nagios template files that define
configurable parameters.
As shown in Figure 8-8, the template files, the nagios_vars.ini file, and data from the
configuration and management database (CMDB) are processed by a Nagios configurator to
generate include files that form the basis for the configured Nagios application.
8.3 Adjusting the Nagios Configuration 115