Installation guide

otherwise indicated. Exceptions to these rules are noted within the individual probe references.
Important
Some probes have thresholds based on time. In order for such CRITICAL and WARNING
thresholds to work as intended, their values cannot exceed the amount of time allotted to the
timeout period. Otherwise, an UNKNOWN status is returned in all instances of extended latency,
thereby nullifying the thresholds. For this reason, Red Hat strongly recommends ensuring that
timeout periods exceed all timed thresholds.
Run your probes without notifications for a time to establish baseline performance for each of your
systems. Although the default values provided for probes may suit your needs, every organization has a
different environment that may require altering thresholds.
A.2. Apache 1.3.x and 2.0.x
The probes in this section may be applied to instances of the Apache web server. Although the default
values presume you will apply these probes using standard HT T P, you may also use them over secure
connections by changing the application protocol to https and the port to 4 4 3.
A.2.1. Apache::Processes
The Apache::Processes probe monitors the processes executed on an Apache web server and collects
the following metrics:
Data Transferred Per Child - Records data transfer information about individual children. A child
process is one that is created from the parent process or another process.
Data Transferred Per Slot - The cumulative amount of data transferred by a child process that
restarts. The number of slots is configured in the httpd.conf file using the
MaxRequestsPerChild setting.
The ExtendedStatus directive in the httpd.conf file of the Web server must be set to On for this
probe to function properly.
Table A.1. Apache::Processes settings
Field Value
Application Protocol* http
Port* 80
Pathname* /server-status
UserAgent* NOCpulse-ApacheUptime/1.0
Username
Password
Timeout* 15
Critical Maximum Megabytes T ransferred Per Child
Warning Maximum Megabytes T ransferred Per Child
Critical Maximum Megabytes T ransferred Per Slot
Warning Maximum Megabytes T ransferred Per Slot
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