check_memcache with python

 在 http://exchange.nagios.org/ 上有shell 写的脚本，nagios可以监控到命中率，他是基于 telnet 的，使用之后看到 进程里有个telnet 进程，很不爽，而且脚本休要修改一下，不然会报错，不知道大家是不是同样的问题，而我，想要的是监控命中率，还有内存使用率以及，当前连接数·所以只能自己动手来写个脚本了·在python的官网上看到有 python-memcache包，就下来看了一下源码，使用还是很方便的·。

shell $> cat check_memcache.py

#!/usr/bin/python
import memcache
import getopt
import sys

def usage():
   print """check_memcache is a Nagios to monitor memcached memory Plugin
   Usage:

   check_memcache [-h|--help][-w|warning][-c|critical]

   Options:
       --help|-h)
            print check_memcache help
       --warning|-w)
            Sets a warning level for memcache use memory.Default is  ff
       --critical|-c)
            Sets a critical level for memcache use memory.Default is:off. """
   sys.exit(0)

try:
    options,args = getopt.getopt(sys.argv[1:],"hw:c:",["help","warning=","critical="])

except getopt.GetoptError:
   usage()
   sys.exit(3)

for name,value in options:
  if name in ("-h","--hlep"):
     usage()
  if name in ("-w","--warning"):
     warning = int(value)
  if name in ("-c","--critical"):
     critical = int(value)
try:
   mc = memcache.Client(['127.0.0.1:11211'], debug=0)
   conn = mc.get_stats()
   memstat = conn[0][1]

except:
   print 'please check your memcached host and port'
   sys.exit(3)

#for key in a:
#  print '%s : %s' % (key,a[key])

tobal = float(memstat['limit_maxbytes'])
memory = float(memstat['bytes'])
free = (tobal - memory)/1024
free = '%d%s' % (free,'kb')
connection = memstat['accepting_conns']
memory = memory * 1024
if memory < 0.01:
   memory = 0.01
else:
   memory = int(memory)

get_miss = float(memstat['get_misses'])
get_hits = float(memstat['get_hits'])
if get_miss == 0 and get_hits == 0:
   hitrate = 100
else:
   hitrate = get_hits/(get_hits + get_miss)*100

hitrate = '%d%s' % (hitrate,'%')
output = 'use:%skb,free:%s,hitrate:%s,connection:%s' % (memory,free,hitrate,connection)
perfdata = "'use'=%skb 'free'=%s 'hitrate'=%s 'connection'=%s" % (memory,free,hitrate,connection)

if 'warning' in dir() and 'critical' in dir():
  if memory >= warning:
     print 'WARNING - %s|%s' % (output,perfdata)
     sys.exit(1)
  elif memory >=critical:
     print 'CRITICAL - %s|%s' % (output,perfdata)
     sys.exit(2)
  else:
     print 'OK - %s|%s' % (output,perfdata)
     sys.exit(0)
else:
  print 'OK - %s|%s' % (output,perfdata)
  sys.exit(0)

安装步骤：
1.

shell $> wget http://www.nginxs.com/download/check_memcache

2.测试 ./check_memcache

3.修改客户端 nrpe
shell $> vim /etc/nagios/nrpe.cfg
command[check_memcache]=/usr/lib/nagios/plugins/check_memcache -w $ARG1$ -c $ARG2$

4.服务端添加监控服务

define service{
use local-service
host_name eric_1,eric_2,eric_3
service_description memcached_memory
check_command check_nrpe!check_memcache!4000!5000
}