-------------------------------Main Program-------------------------------

Monitoring Script：

[root@config ~]# cd asptools/

[root@config asptools]# cat NIC-Monitor.sh 

#!/bin/sh#Author:zhai_kang,20131010export PATH=$PATH:/sbinDest_Path=/var/log/Monitor############################################NIC traffic monitoring###################################################Function-----Rate Units:k/sNIC_Monitor(){        rx1=$(ifconfig $1|grep "RX bytes"|awk '{print $2}'|awk -F: '{print $2}')        sleep 1        rxa=$(($rx1 / 1024))        rx2=$(ifconfig eth0|grep "RX bytes"|awk '{print $2}'|awk -F: '{print $2}')        rxb=$(($rx2 / 1024))        rx=$(($rxb-$rxa))        if [[ $rx -lt 0 ]]        then                rx=`expr 0 - $rx`        fi        echo -e "$(date +%Y%m%d-%H:%M:%S)\t\t$i\t\t\t$rx"}##main program###Check the log directory exists and createif [[ ! -d $Dest_Path ]]then        mkdir -p $Dest_Pathfi#Log titleif [[ $(date +%H%M) == "0000" ]]then        echo -e "yyyymmdd-H:M:S\t\t\tInterface\t\tNIC-Flow(Units:k/s)" > $Dest_Path/NIC-Monitor-$(date +%Y%m%d).logfi#Monitoring datasign=`ifconfig -s | grep -v lo | grep -v Iface | awk '{print $1}'`for i in $signdo        NIC_Monitor $i  >> $Dest_Path/NIC-Monitor-$(date +%Y%m%d).logdoneexit

Cron job：
[root@config asptools]# crontab -l

*/1 00,8-16 * * * /root/asptools/NIC-Monitor.sh >> ～/asptools/log/nic.log 2>&1

See the log：
[root@config asptools]# ll log/
total 0
-rw-r--r-- 1 root root 0 Oct 10 17:59 nic.log
[root@config asptools]# cat /var/log/Monitor/NIC-Monitor-20131011.log

-------------------------------Syslog Server-------------------------------

Find the directory where the configuration file：
[root@config asptools]# cat /etc/logrotate.conf | grep -B 1 include

# RPM packages drop log rotation information into this directoryinclude     /etc/logrotate.d

Custom configuration file：

[root@config asptools]# cat /etc/logrotate.d/Monitor 

/var/log/Monitor/*.log {        compress        notifempty        rotate         6        create         0400 root root        olddir         /var/log/Monitor/old/        sharedscripts        weekly}

Create a log backup directory：

[root@config asptools]# mkdir /var/log/Monitor/old
Manual testing：
[root@config asptools]# logrotate -f /etc/logrotate.d/Monitor

---------------------------------------------------------------------

For more information refer to：man logrotate