Red Hat NETWORK 4.0 -, Справочное руководство

Страница: 240 / 290

224 Appendix C. Probes
C.5.12. Linux::Swap Usage
The Linux::Swap Usage probe monitors the swap partitions running on a system and re-
ports the following metric:
•
Swap Free — The percent of swap memory currently free.
Requirements — The Red Hat Network Monitoring Daemon (
rhnmd
) must be running on
the monitored system to execute this probe.
Field Value
Timeout* 15
Warning Minimum Swap Free
Critical Minimum Swap Free
Table C-26. Linux::Swap Usage settings
C.5.13. Linux::TCP Connections by State
The Linux::TCP Connections by State probe identifies the total number of TCP connec-
tions, as well as the quantity of each in the following states:
•
TIME_WAIT — The socket is waiting after close for remote shutdown transmission so
it may handle packets still in the network.
•
CLOSE_WAIT — The remote side has been shut down and is now waiting for the socket
to close.
•
FIN_WAIT — The socket is closed, and the connection is now shutting down.
•
ESTABLISHED — The socket has a connection established.
•
SYN_RCVD — The connection request has been received from the network.
This probe can be helpful in finding and isolating network traffic to specific IP addresses
or examining network connections into the monitored system.
The filter parameters for the probe let you narrow the probe’s scope. This probe uses the
netstat -ant
command to retrieve data. The Local IP address and Local port param-
eters use values in the Local Address column of the output; the Remote IP address and
Remote port parameters use values in the Foreign Address column of the output for re-
porting.
Requirements — The Red Hat Network Monitoring Daemon (
rhnmd
) must be running on
the monitored system to execute this probe.