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需求是我们需要对服务器上的流量进行监控，网络上有个流传的 check_traffic.sh，它需要被监控机开启 snmp。但是感觉都使用上了 nagios 还要开 snmp。有点斧子剪刀一起用的感觉，所以就动手写了个监控流量的 shell。
相关阅读 ：
网络监控器 Nagios 全攻略 http://www.linuxidc.com/Linux/2013-07/87067.htm
Nagios 搭建与配置详解 http://www.linuxidc.com/Linux/2013-05/84848.htm
Nginx 环境下构建 Nagios 监控平台 http://www.linuxidc.com/Linux/2011-07/38112.htm
在 RHEL5.3 上配置基本的 Nagios 系统 (使用 Nagios-3.1.2) http://www.linuxidc.com/Linux/2011-07/38129.htm
CentOS 5.5+Nginx+Nagios 监控端和被控端安装配置指南 http://www.linuxidc.com/Linux/2011-09/44018.htm
Ubuntu 13.10 Server 安装 Nagios Core 网络监控运用 http://www.linuxidc.com/Linux/2013-11/93047.htm
脚本如下：
| usage() { echo "Usage: $0 [-n <eth0>] [-w <tx rx>] [-c <tx rx>]" 1>&2; exit 1; } | |
| foundw=0; | |
| foundc=0; | |
| foundn=0; | |
| for item in $@ ; do | |
| if [[$foundn == 1 ]]; then | |
| n=$item; | |
| foundn=2; | |
| continue; | |
| fi | |
| if [[$foundw == 1 ]]; then | |
| w1=$item; | |
| foundw=2; | |
| continue; | |
| fi | |
| if [[$foundw == 2 ]]; then | |
| w2=$item; | |
| foundw=3; | |
| continue; | |
| fi | |
| if [[$foundc == 1 ]]; then | |
| c1=$item; | |
| foundc=2; | |
| continue; | |
| fi | |
| if [[$foundc == 2 ]]; then | |
| c2=$item; | |
| foundc=2; | |
| continue; | |
| fi | |
| if [["$item" == "-w" ]]; then | |
| foundw=1; | |
| continue; | |
| fi | |
| if [["$item" == "-c" ]]; then | |
| foundc=1; | |
| continue; | |
| fi | |
| if [["$item" == "-n" ]]; then | |
| foundn=1; | |
| continue; | |
| fi | |
| done | |
| if [-z "${w1}" ] || [-z "${w2}" ] || [-z "${c1}" ] || [-z "${c2}" ] || [-z "${n}" ]; then | |
| usage | |
| fi | |
| R1=`cat /sys/class/net/$n/statistics/rx_bytes` | |
| T1=`cat /sys/class/net/$n/statistics/tx_bytes` | |
| sleep 1 | |
| R2=`cat /sys/class/net/$n/statistics/rx_bytes` | |
| T2=`cat /sys/class/net/$n/statistics/tx_bytes` | |
| TBPS=`expr $T2 - $T1` | |
| RBPS=`expr $R2 - $R1` | |
| TMBPS=`expr $TBPS / 1024 / 128` | |
| RMBPS=`expr $RBPS / 1024 / 128` | |
| if [[$TMBPS -ge $c1]] || [[$RMBPS -ge $c2 ]] ; then | |
| echo "Critical - current is ${TMBPS}, ${RMBPS}"; | |
| exit 2; | |
| fi | |
| if [[$TMBPS -ge $w1]] || [[$RMBPS -ge $w2 ]] ; then | |
| echo "WARNING - current is ${TMBPS}, ${RMBPS}"; | |
| exit 1; | |
| fi | |
| echo "OK - current is ${TMBPS}, ${RMBPS}"; | |
| exit 0; |
其中的 w 和 c 的数值单位都是 Mb。
Nagios 的详细介绍 ：请点这里
Nagios 的下载地址 ：请点这里
正文完
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