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Appendix C.
Probes
As described in Section 6.9 Monitoring — , Monitoring-entitled systems can have
probes applied to them that constantly confirm their health and full operability. This
appendix lists the available probes broken down by command group, such as Apache.
Many probes that monitor internal system aspects (such as the Linux::Disk Usage probe)
rather than external aspects (such as the Network Services::SSH probe) require the instal-
lation of the Red Hat Network Monitoring Daemon (
rhnmd
). This requirement is noted
within the individual probe reference.
Each probe has its own reference in this appendix that identifies required fields (marked
with *), default values, and the thresholds that may be set to trigger alerts. Similarly, the
beginning of each command group’s section contains information applicable to all probes
in that group. Section C.1 Probe Guidelines covers general guidelines; the remaining sec-
tions examine individual probes.
Note
Nearly all of the probes use Transmission Control Protocol (TCP) as their transport pro-
tocol. Exceptions to this are noted within the individual probe references.
C.1. Probe Guidelines
The following general guidelines outline the meaning of each probe state, and provide
guidance in setting thresholds for your probes.
The following list provides a brief description of the meaning of each probe state:
Unknown
The probes that cannot collect the metrics needed to determine probe state. Most
(though not all) probes enter this state when exceeding their timeout period. Probes in
this state may be configured incorrectly, as well.
Pending
The probes whose data has not been received by the RHN Satellite Server. It is normal
for new probes to be in this state. However, if all probes move into this state, your
monitoring infrastructure may be failing.