Nagios监控流量脚本

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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：

#!/bin/sh

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;