前提：把check_mem.sh放到/usr/local/nagios/libexec下，并赋予执行权限
chmod 755 check_mem.sh
 
一，监控本地（监控端本身）内存使用：
#修改commands配置
vim /usr/local/nagios/etc/objects/commands.cfg
#增加以下内容
define command{
                command_name        check_mem
                command_line        $USER1$/check_mem.sh -w $ARG1$ -c $ARG2$
                }
#修改localhost.cfg
vim /usr/local/nagios/etc/objects/localhost.cfg
#增加以下内容
define service{
                use                                                         local-service
                host_name                                             localhost
                service_description                         memory
                check_command                                     check_mem!20!10!
                }
 
二，监控客户端内存使用情况：

  1,#修改客户端配置文件
    vim /usr/local/nagios/etc/nrpe.cfg

        #增加以下内容    
    command[check_mem]=/usr/local/nagios/libexec/check_mem.sh -w 20 -c 10
            
  2,#修改主控制端相关配置文件
     vim /usr/local/nagios/etc/service/liguxk.cfg    #主控端定义的被控端的配置文件
     #增加以下内容
                  define service{
                  use                                                         generic-service
                  host_name                                             liguxk
                  service_description                         Memory
                  check_command                                     check_nrpe!check_mem
                  }
 
三，总结
 
监控本地资源的调用流程为：
localhost.cfg—>command.cfg—>libexec
监控客户端流程：
liguxk.cfg—>服务器nrpe——>客户端nrpe.cfg—>客户端libexec