Red Hat NETWORK SATELLITE 5.1.1 - RELEASE NOTES, Справочное руководство

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Appendix C. Probes
204
While adding probes, select meaningful thresholds that, when crossed, notify you and your
administrators of problems within your infrastructure. Timeout periods are entered in seconds unless
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.
Remember that Red Hat recommends running 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.
C.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 HTTP, you may also use them over
secure connections by changing the application protocol to
https
and the port to
443
.
C.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 only on 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.
Field Value
Application Protocol* http
Port* 80
Pathname* /server-status
UserAgent* NOCpulse-ApacheUptime/1.0
Username
Password
Timeout*
15
Critical Maximum Megabytes Transferred Per Child
Warning Maximum Megabytes Transferred Per Child
Critical Maximum Megabytes Transferred Per Slot