在被监控机

1./usr/local/nagios/libexec/ 下添加check_mem

内容如下

#

#!/bin/bash

# check memory script
# sunny 2008.2.15

# Total memory

TOTAL=`free -m | head -2 |tail -1 |gawk '{print $2}'`
# Free memory
FREE=`free -m | head -2 |tail -1 |gawk '{print $4}'`

# to calculate free percent

# use the expression  free * 100 / total
FREETMP=`expr $FREE \* 100`
PERCENT=`expr $FREETMP / $TOTAL`

echo "$FREE MB ($PERCENT%) Free Memory"

exit 0

2.  chmod a+x  check_mem.sh

3.vi /usr/local/nagios/etc/nrpe.cfg  增加command

command[check_mem]=/usr/lib64/nagios/plugins/check_mem.sh -w 10 -c 5

nagios 服务端

1.在command.cfg添加如下   （这一步好像也可以不用）

# 'check_mem' command definition
define command{


       command_name    check_mem
       command_line    $USER1$/check_mem -H $HOSTADDRESS$
       }

2.修改linux客户机配置文件，添加

define service{

       use                    generic-service

       host_name           mylinux

       service_description  check_mem

       check_command     check_nrpe!check_mem

            }

3.验证配置: nagios  -v /etc/nagios/nagios.cfg

4.重启nagios :service nagios restart

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