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cacti_remote_by_http
- cacti command for getting remote values by
http
cacti_remote_by_http
[ -D ] -H ip-address -p port [ -u unit ] key
cacti_remote_by_http is a cacti plugin for remote checking
hosts by (simplified) http.
It was written as a (fast) alternative to net-snmp
and it is designed to work with knoerre, a small http-server.
cacti_remote_by_http
sends according to the given key a HTTP request to
the remote server. Then it expects a value as a result of the remote check.
It takes the value from the last line of the remote HTTP response. The value
will be interpreted as a positive integer with up to 63 bits.
key is a string sent as http
GET request to the remote server and depends
on the type of the remote http server. If i.e. the key load1 is specified
then the following request is sent:
GET /load1 HTTP/1.0
If you use i.e.
knoerre as remote http
server then you will get a http response with the
current load-per-1-minute as remote check value in the last line.
- -H ip-address
- Specify the IP address of the remote server to check.
- -p port
- Specify the port of the http
server on the remote host.
- -u unit
- Specify
an optional unit string which is placed after the remote value and which
is visible in nagios.
- -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_remote_by_http(1)
, knoerre(1)
http://downloads.tuxad.de/nagios-fwb
One example of cacti_remote_by_http
with knoerre as remote http server:
# cacti_remote_by_http
-H 172.16.1.1 -p
8888 -u load1 load1
load1:0.33
Frank Bergmann, http://www.tuxad.com
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