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check_tcp_connect - nagios plugin for checking tcp connects
check_tcp_connect
-I ip-address -w warnlevel -c critlevel [ -p port ] [ -P resultprefix ] [ -t timeout
] [ -T(O|W|C) ] [ -D ]
check_tcp_connect is a nagios plugin for checking TCP ports.
It tries to connect to the given port and measures the time to connect.
- -I ip-address
- Specify the IP address of the remote server to check.
- -w warnlevel
- Specify the warning level (connect time in ms).
- -c critlevel
- Specify the critical level (connect time in ms).
- -p port
- Specify the port
to connect to on the remote host (default: 80).
- -P resultprefix
- Specify
prefix of the result string (default: "TCP")
- -t timeout
- The plugins internal
timeout in seconds (default: 10).
- -TO
- On timeout return OK instead of UNKNOWN.
- -TW
- On timeout return WARNING instead of UNKNOWN.
- -TC
- On timeout return
CRITICAL instead of UNKNOWN.
- -D
- Use TCP_DEFER_ACCEPT (see tcp(7)
). This
can speed up our http-communication
by approx. 10 percent, but it breaks
tcp-communication by RFC - like many others too. It can also cause trouble
with loadbalancers like F5 which send "early" ACK packets to the server
before ACK from client.
check_tcp_connect does not use any files,
a sample nagios config is shown here:
define service{
use service_port
name http
check_command check_tcp_connect!500!5000!70
register 0
}
define command{
command_name check_tcp_connect
command_line $USER1$/check_tcp_connect -I $HOSTADDRESS$ -w $ARG1$ -c $ARG2$
-p $ARG3$
}
http://downloads.tuxad.de/ngtx
A sample host-alive-check:
$ check_tcp_connect -I 1.2.3.4 -w 1000 -c 5000 -p 22 -P "TCP Port 22"
TCP Port 22 OK - 0.000 second response time |time=0.000533s
Frank Bergmann,
http://www.tuxad.com
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