查看网络负载

http://blog.youkuaiyun.com/0210/article/details/5437368

http://blog.youkuaiyun.com/vebasan/article/details/5515235

ifconfig 如果不能用，就用/sbin/ifconfig

ifconfig -a 所有的网卡情况

ifconfig 就会出现当前正在使用的网卡的情况，

eth0

eth0:0 //和上面是一个网卡，虚拟的一个网卡，但是绑定到不同的ip

lo //localhost

网卡的流量用以下的脚本

./netrate eth2查看网卡2的流量

#!/bin/bash

if [ -n "$1" ]; then
eth_name=$1
else
eth_name="eth0"
fi

i=0

send_o=`/sbin/ifconfig $eth_name | grep bytes | awk '{print $6}' | awk -F : '{print $2}'`
recv_o=`/sbin/ifconfig $eth_name | grep bytes | awk '{print $2}' | awk -F : '{print $2}'`
send_n=$send_o
recv_n=$recv_o

while [ $i -le 100000 ]; do
send_l=$send_n
recv_l=$recv_n
sleep 1
send_n=`/sbin/ifconfig $eth_name | grep bytes | awk '{print $6}' | awk -F : '{print $2}'`
recv_n=`/sbin/ifconfig $eth_name | grep bytes | awk '{print $2}' | awk -F : '{print $2}'`
i=`expr $i + 1`
send_r=`expr $send_n - $send_l`
recv_r=`expr $recv_n - $recv_l`
total_r=`expr $send_r + $recv_r`
send_ra=`expr \( $send_n - $send_o \) / $i`
recv_ra=`expr \( $recv_n - $recv_o \) / $i`
total_ra=`expr $send_ra + $recv_ra`
#sendn=`/sbin/ifconfig $eth_name | grep bytes | awk -F /( '{print $3}' | awk -F /) '{print $1}'`
#recvn=`/sbin/ifconfig $eth_name | grep bytes | awk -F /( '{print $2}' | awk -F /) '{print $1}'`
clear
echo  "Last second  :   Send rate: $send_r Bytes/sec  Recv rate: $recv_r Bytes/sec  Total rate: $total_r Bytes/sec"
echo  "Average value:   Send rate: $send_ra Bytes/sec  Recv rate: $recv_ra Bytes/sec  Total rate: $total_ra Bytes/sec"
#echo  "Total traffic after startup:    Send traffic: $sendn  Recv traffic: $recvn"
done