Red Hat NETWORK 3.7 -, Справочное руководство

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Appendix C. Probes 157
•
Swap Free — The percent of swap memory currently free.
Requirements — The Red Hat Network Monitoring Daemon (
rhnmd
) must be running on the moni-
tored 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 connections, 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 a command
of
netstat -ant
to retrieve data. The
Local IP address
and
Local port
parameters 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 reporting.
Requirements — The Red Hat Network Monitoring Daemon (
rhnmd
) must be running on the moni-
tored system to execute this probe.
Field Value
Local IP address filter pattern list
Local port number filter
Remote IP address filter pattern list
Remote port number filter
Timeout*
15
Critical Maximum Total Connections
Warning Maximum Total Connections
Critical Maximum TIME_WAIT Connections
Warning Maximum TIME_WAIT Connections