前言

使用shell命令从/proc/net/dev获取流量信息进行监控。

脚本

#!/bin/bash

interface=$1

warn_rx_limit=$2

warn_tx_limit=$3

critical_rx_limit=$4

critical_tx_limit=$5

#使用方法

USAGE="USAGE : $0 interface warn_rx_limit warn_tx_limit critical_rx_limit critical_tx_limit, such as $0 eth0 10 10 50 50"

if [ $# -lt 5 ]; then

echo "Hava no enough parameters - "$USAGE

exit 3

fi

record_time=$(date +%s)

rx=0

tx=0

content=$(cat /proc/net/dev | grep -v "|" | awk '{split($1,b,":");print b[1]" "$2" "$10 }')

a=0

for i in $content; do

if [ "$i" == "$interface" ]; then

# echo $i

let a=a+1

continue

fi

if [ "$a" == "1" ]; then

rx=$i

# echo "a=$a"

let a=a+1

continue

fi

if [ "$a" == "2" ]; then

tx=$i

# echo "a=$a"

break

fi

# echo "a=$a"

# echo $i

done

if [ "$a" == "0" ]; then

echo "$interface is not exists"

exit 3

fi

# echo "rx="$rx

# echo "tx="$tx

record_file="/tmp/net_traffic_$interface"

if [ ! -f $record_file ]; then

echo "$record_time $rx $tx" >$record_file

echo "first check..."

exit 0

fi

last_record_time=$(cat $record_file | awk '{print $1}')

last_rx=$(cat $record_file | awk '{print $2}')

last_tx=$(cat $record_file | awk '{print $3}')

# echo $last_record_time

# echo $last_rx

# echo $last_tx

interval=$(awk -v last_record_time=$last_record_time -v record_time=$record_time 'BEGIN{print record_time-last_record_time}')

if [ "$interval" == "0" ]

then

echo "check interval must greater than 1s"

exit 4

fi

avg_rx=$(awk -v rx=$rx -v last_rx=$last_rx -v last_record_time=$last_record_time -v record_time=$record_time 'BEGIN{a=(rx-last_rx)*8.0/1024.0/1024.0/(record_time-last_record_time);printf("%.4f",a)}')

# echo "avg_rx="$avg_rx"Mbps"

avg_tx=$(awk -v tx=$tx -v last_tx=$last_tx -v last_record_time=$last_record_time -v record_time=$record_time 'BEGIN{a=(tx-last_tx)*8.0/1024.0/1024.0/(record_time-last_record_time);printf("%.4f",a)}')

total=$(awk -v avg_rx=$avg_rx -v avg_tx=$avg_tx 'BEGIN{printf("%.4f",avg_rx+avg_tx)}' )

rx_result=$(awk -v avg_rx=$avg_rx -v warn_rx_limit=$warn_rx_limit -v critical_rx_limit=$critical_rx_limit 'BEGIN{if(avg_rx>critical_rx_limit)print 100 ; else if(avg_rx>warn_rx_limit) print 50 ; else print 0}')

tx_result=$(awk -v avg_tx=$avg_tx -v warn_tx_limit=$warn_tx_limit -v critical_tx_limit=$critical_tx_limit 'BEGIN{if(avg_tx>critical_tx_limit)print 100 ; else if(avg_tx>warn_tx_limit) print 50 ; else print 0}')

if [[ "$rx_result" == "100" || "$tx_result" == "100" ]]; then

echo "Critical - Network traffice in is $avg_rx Mbps , out is $avg_tx Mbps ,check interval is $interval s | In=${avg_rx}Mbps;$warn_rx_limit;$critical_rx_limit;0;0 Out=${avg_tx}Mbps;$warn_tx_limit;$critical_tx_limit;0;0 Total=${total}Mbps Time_interval=${interval}s"

echo "$record_time $rx $tx" >$record_file

exit 1

elif [[ "$rx_result" == "50" || "$tx_result" == "50" ]]; then

echo "Warning - Network traffice in is $avg_rx Mbps , out is $avg_tx Mbps ,check interval is $interval s | In=${avg_rx}Mbps;$warn_rx_limit;$critical_rx_limit;0;0 Out=${avg_tx}Mbps;$warn_tx_limit;$critical_tx_limit;0;0 Total=${total}Mbps Time_interval=${interval}s"

echo "$record_time $rx $tx" >$record_file

exit 2

else

echo "OK - Network traffice in is $avg_rx Mbps , out is $avg_tx Mbps ,check interval is $interval s | In=${avg_rx}Mbps;$warn_rx_limit;$critical_rx_limit;0;0 Out=${avg_tx}Mbps;$warn_tx_limit;$critical_tx_limit;0;0 Total=${total}Mbps Time_interval=${interval}s"

echo "$record_time $rx $tx" >$record_file

exit 0

fi

总结

使用方法

./check_net_traffice.sh eth0 10 10 50 50

默认单位是Mbps，如果是nagios配置的时候注意临时记录文件/tmp/net_traffic_×的权限。