如何编写 Nagios 插件

#!/usr/bin/env python

import os,sys

(d1, d2, d3) = os.getloadavg()

if d1 >= 5.0:
print "GETLOADAVG CRITICAL: Load average is %.2f" % (d1)
sys.exit(2)
elif d1 >= 2.0:
print "GETLOADAVG WARNING: Load average is %.2f" % (d1)
sys.exit(1)
else:
print "GETLOADAVG OK: Load average is %.2f" % (d1)
sys.exit(0)

define command{
command_name    check_mygetloadavg
command_line    /path/to/check_getloadavg
}

define service{
use                             service-template
host_name                       localhost
service_description             LoadAverage
check_period                    24x7
contact_groups                  server-admins
notification_options            c,r
check_command                   check_mygetloadavg
}

#!/usr/bin/env python

import os
import sys
import getopt

def usage():
print """Usage: check_getloadavg [-h|--help] [-m|--mode 1|2|3] \
[-w|--warning level] [-c|--critical level]"

Mode: 1 - last minute ; 2 - last 5 minutes ; 3 - last 15 minutes"
Warning level defaults to 2.0
Critical level defaults to 5.0"""
sys.exit(3)

try:
options, args = getopt.getopt(sys.argv[1:],
"hm:w:c:",
"--help --mode= --warning= --critical=",
)
except getopt.GetoptError:
usage()
sys.exit(3)

argMode = "1"
argWarning = 2.0
argCritical = 5.0

for name, value in options:
if name in ("-h", "--help"):
usage()
if name in ("-m", "--mode"):
if value not in ("1", "2", "3"):
usage()
argMode = value
if name in ("-w", "--warning"):
try:
argWarning = 0.0 + value
except Exception:
print "Unable to convert to floating point value\n"
usage()
if name in ("-c", "--critical"):
try:
argCritical = 0.0 + value
except Exception:
print "Unable to convert to floating point value\n"
usage()

try:
(d1, d2, d3) = os.getloadavg()
except Exception:
print "GETLOADAVG UNKNOWN: Error while getting load average"
sys.exit(3)

if argMode == "1":
d = d1
elif argMode == "2":
d = d2
elif argMode == "3":
d = d3

if d >= argCritical:
print "GETLOADAVG CRITICAL: Load average is %.2f" % (d)
sys.exit(2)
elif d >= argWarning:
print "GETLOADAVG WARNING: Load average is %.2f" % (d)
sys.exit(1)
else:
print "GETLOADAVG OK: Load average is %.2f" % (d)
sys.exit(0)

define command{
command_name    check_mygetloadavg2
command_line    /path/to/check_getloadavg2 -m $ARG1$ -w $ARG2$ -c $ARG3$
}

define service{
use                             service-template
host_name                       localhost
service_description             LoadAverage2
check_period                    24x7
contact_groups                  server-admins
notification_options            c,r
check_command                   check_mygetloadavg2!1!3.0!6.0
}

#!/usr/bin/env tclsh

# parse arguments
package require cmdline
set options {
{country1.arg "" "Country 1"}
{country2.arg "" "Country 2"}
{lowerwarning.arg "" "Lower warning limit"}
{upperwarning.arg "" "Upper warning limit"}
{lowercritical.arg "" "Lower critical limit"}
{uppercritical.arg "" "Upper critical limit"}
}

array set opt [cmdline::getoptions argv $options {: [options]}]

# if the user did not supply all arguments, show help message
for each necessary [array names opt] {
if {$opt($necessary) == ""} {
set argv "-help"
catch {cmdline::getoptions argv $options {: [options]}} usage
puts stderr $usage
exit 3
}
}

# load TclWebServices package
package require WS::Client

if {[catch {
# download WSDL
WS::Client::GetAndParseWsdl \ http://www.xmethods.net/sd/2001/CurrencyExchangeService.wsdl \
{} currency

# create stub commands
WS::Client::CreateStubs currency

# download the actual exchange rate
set result [lindex \
[currency::getRate "England" "Japan"] 1]
} error]} {
# if downloading the rate failed for some reason, report it
puts "EXCHANGERATE UNKNOWN: $error"
exit 3
}

if {($result < $opt(lowercritical)) || ($result > $opt(uppercritical))} {
puts "EXCHANGERATE CRITICAL: rate is $result"
exit 2
}
if {($result < $opt(lowerwarning)) || ($result > $opt(upperwarning))} {
puts "EXCHANGERATE WARNING: rate is $result"
exit 1
}
puts "EXCHANGERATE OK: rate is $result"
exit 0

command_line    /path/to/check_exchangerate
-country1 $ARG1$ -country2 $ARG2$ -lowercritical \
$ARG3$ -lowerwarning $ARG4$ -upperwarning $ARG5$ -uppercritical $ARG6$

define service{
use                             service-template
host_name                       localhost
service_description             EXCHANGERATE
check_period                    24x7
contact_groups                  other-admins
notification_options            c,r
check_command                   check_exchangerate!England!Japan!200!225!275!300
}