Install Nagios (Agent) nrpe client and plugins in Ubuntu/Debian

1. 安装
   apt-get install nagios-nrpe-server nagios-plugins
2. 修改nrpe.cfg
   vi /etc/nagios/nrpe.cfg
   修改Allow Host，添加监控机的IP
   service nagios-nrpe-server restart
   修改services
   vi /etc/services
3. 安装流量监控
   下载插件check_traffic插件
   apt-get install snmpd snmp-mibs-downloader
   若提示无法安装
   修改sources.lst文件
   vi /etc/apt/sources.lst 追加如下2行
   deb http://http.us.debian.org/debian squeeze main contrib non-free
   deb http://security.debian.org squeeze/updates main contrib non-free
   更新安装源
   apt-get update 
   apt-get install snmp-mibs-downloader