python编写的check_log插件检查日志关键词for nagios

python编写的check_log插件检查日志关键词for nagios，供大家学习参考。

基于 python-2.5.2 版本写的一个小插件，巡检日志里的关键词，可以设置阀值，超过阀值报警！
开始写的时候没有太多注意，结果处理一个大的日志文件脚本执行时间有点长，看了下日志有 70M，想了一下的确啊。
如果一次读取么多字符串处理起来肯定会漫长！随后在python.org 上看到了MMAP，这个模块，看到这个一下让我想起，以前编译lustre的时候，添加这个小模块时候的作用，虚拟文件。大大提升了读取大文件内容的速度！

下面看脚本,实现的功能为：检测nginx日志有多少个 No such file or directory
nagios $> cat check_log

复制代码代码如下:

# -*- coding: utf-8 -*-
#!/usr/bin/python
# QQ:277057817
import mmap
import os
import sys
import getopt

def usage():
print """
check_log is a Nagios monitor logs Script

Usage:

    Options:
           --help|-h)
                 check_log help.
           --log|-l)
                 sets log file path.
           --string|-s)
                 sets monitor Keywords.
           --warning|-w)
                 sets Keywords quantity.Default is: off
           --critical|-c)
                 sets Keywords quantity.Default is: off
     example:
            ./check_log -l /var/log/nginx.log -s "502 Bad Gateway" -w 5 -c 10 """
    sys.exit(3)

try:
options,args = getopt.getopt(sys.argv[1:],"hl:s:w:c:",["--help","log=","string=","warning=","critical="])
except getopt.GetoptError:
usage()

for n,v in options:
    if n in ("-h","--help"):
       usage()
    if n in ("-l","--log"):
       log = v
    if n in ("-s","--string"):
       string = v
    if n in ("-w","--warning"):
       warning = v
    if n in ("-c","--critical"):
       critical = v

if 'log' in dir() and 'string' in dir():
   try:
      file = open(log,"r+")
      size = os.path.getsize(log)
      data = mmap.mmap(file.fileno(),size)
     # 用了mmap模块的功能！
      text = data.read(-1)
      counts = text.count(string)
      counts = str(counts)
      data.close()
      file.close()
   except IOError:
      print "No such file or directory:"+log
else:
   usage()

if 'warning' in dir() and 'critical' in dir():
   if warning < critical:
      if counts >= warning and counts < critical:
         print 'WARNING - %s views %s' % (string,counts)
         sys.exit(2)
      elif counts >= critical:
         print 'CRITICAL - %s views %s' % (string,counts)
         sys.exit(1)
      else:
         print 'OK - %s views %s' % (string,counts)
         sys.exit(0)
   else:
     print "Must critical > warning"
     sys.exit(0)
else:
    print 'OK - %s views %s' % (string,counts)
    sys.exit(0)

调用示例：

复制代码代码如下:

	nagios $> python check_log -l /usr/local/nginx/logs/error.log -s "No such file or directory" -w 2 -c 3

	CRITICAL - No such file or directory views 3

添加到 commands.cfg：
nagios $> vim /usr/local/nagios/etc/objects/commands.cfg

复制代码代码如下:

	define command{

	        command_name check_log

	        command_line $USER1$/check_log -l $ARG1$ -s $ARG2$ -w  $ARG3$ -c  $ARG4$

	}

然后在客户端 nrpe.cfg 添加：
nginx $> vim /usr/local/nagios/etc/nrpe.cfg

复制代码代码如下:

	command[check_log]=/usr/local/nagios/libexec/check_log -l /var/logs/nginx.log -s "No such file or directory" -w 2 -c 5

然后在服务端的 services.cfg 添加：
nagios $> vim /usr/local/nagios/etc/tuokou/services.cfg

复制代码代码如下:

	define service{

	    use                     local-service,srv-pnp

	    host_name               web

	    service_description     nginx log

	    check_command         check_nrpe!check_log

	}

(责任编辑：IT)

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python编写的check_log插件检查日志关键词for nagios