nagios 监控内存使用情况

1. 监控本机内存
   cd /usr/lib64/nagios/plugins
   touch check_mem.sh

   #!/bin/bash
   
   if [ "$1" = "-w" ] && [ "$2" -gt "0" ] && [ "$3" = "-c" ] && [ "$4" -gt "0" ]; then
   
           memTotal_b=`free -b |grep Mem |awk '{print $2}'`
           memFree_b=`free -b |grep Mem |awk '{print $4}'`
           memBuffer_b=`free -b |grep Mem |awk '{print $6}'`
           memCache_b=`free -b |grep Mem |awk '{print $7}'`
   
           memTotal_m=`free -m |grep Mem |awk '{print $2}'`
           memFree_m=`free -m |grep Mem |awk '{print $4}'`
           memBuffer_m=`free -m |grep Mem |awk '{print $6}'`
           memCache_m=`free -m |grep Mem |awk '{print $7}'`
   
           memUsed_b=$(($memTotal_b-$memFree_b-$memBuffer_b-$memCache_b))
           memUsed_m=$(($memTotal_m-$memFree_m-$memBuffer_m-$memCache_m))
   
           memUsedPrc=$((($memUsed_b*100)/$memTotal_b))
   
   
           if [ "$memUsedPrc" -ge "$4" ]; then
                   echo "Memory: CRITICAL Total: $memTotal_m MB - Used: $memUsed_m MB - $memUsedPrc% used!|TOTAL=$memTotal_b;;;; USED=$memUsed_b;;;; CACHE=$memCache_b;;;; BUFFER=$memBuffer_b;;;;"
                   $(exit 2)
           elif [ "$memUsedPrc" -ge "$2" ]; then
                   echo "Memory: WARNING Total: $memTotal_m MB - Used: $memUsed_m MB - $memUsedPrc% used!|TOTAL=$memTotal_b;;;; USED=$memUsed_b;;;; CACHE=$memCache_b;;;; BUFFER=$memBuffer_b;;;;"
                   $(exit 1)
           else
                   echo "Memory: OK Total: $memTotal_m MB - Used: $memUsed_m MB - $memUsedPrc% used|TOTAL=$memTotal_b;;;; USED=$memUsed_b;;;; CACHE=$memCache_b;;;; BUFFER=$memBuffer_b;;;;"
                   $(exit 0)
           fi
   
   else
           echo "check_mem v1.1"
           echo ""
           echo "Usage:"
           echo "check_mem.sh -w <warnlevel> -c <critlevel>"
           echo ""
           echo "warnlevel and critlevel is percentage value without %"
           echo ""
           echo "Copyright (C) 2012 Lukasz Gogolin (lukasz.gogolin@gmail.com)"
           exit
   fi

   chmod +x check_mem.sh
   测试check_mem脚本是否能正常使用
   ./check_mem.sh -w 80 -c 90
   修改commands.cfg配置
   vi /etc/nagios/objects/commands.cfg

   define command{
           command_name        check_mem
           command_line        $USER1$/check_mem.sh -w $ARG1$ -c $ARG2$
           }

   vi /etc/nagios/objects/localhost.cfg

   define service{
           use                             local-service,srv-pnp
           host_name                       localhost
           service_description             check_mem
           check_command                   check_mem!80!90
           }

2. 监控被监控机内存使用情况
   拷贝check_mem文件到被监控机的/usr/lib64/nagios/plugins目录下
   scp check_mem root@serverip:/usr/lib64/nagios/plugins/
   修改nrpe.cfg
   vi /usr/local/nagios/etc/nrpe.cfg
   增加一行：command[check_mem]=/usr/lib64/nagios/plugins/check_mem.sh -w 80 -c 90  
   回到nagios监控机修改服务项
   vi /etc/nagios/objects/services.cfg
   增加如下监控代码
   

   define service{
           use                     generic-service
           host_name               Nagios_Centos_Client1
           service_description     Memery Monitoring
           check_command           check_nrpe!check_mem
           }

   nagios -v nagios.cfg
   重启nagios即可