转载过来，以备以后需要
1、查看主机网卡流量
#!/bin/bash
#!/bin/bash
#network
#Mike.Xu
while : ; do
time = 'date +%m"-"%d" "%k":"%M'
day= 'date +%m"-"%d'
rx_before= 'ifconfig eth0|sed -n "8"p|awk ' {print $2} '|cut -c7-'
tx_before= 'ifconfig eth0|sed -n "8"p|awk ' {print $6} '|cut -c7-'
sleep 2
rx_after= 'ifconfig eth0|sed -n "8"p|awk ' {print $2} '|cut -c7-'
tx_after= 'ifconfig eth0|sed -n "8"p|awk ' {print $6} '|cut -c7-'
rx_result=$[(rx_after-rx_before) /256 ]
tx_result=$[(tx_after-tx_before) /256 ]
echo "$time Now_In_Speed: " $rx_result "kbps Now_OUt_Speed: " $tx_result "kbps"
sleep 2
done
done
2、系统状况监控
#!/bin/sh
#systemstat.sh
#Mike.Xu
IP=192.168.1.227
top -n 2| grep "Cpu" >>. /temp/cpu .txt
free -m | grep "Mem" >> . /temp/mem .txt
df -k | grep "sda1" >> . /temp/drive_sda1 .txt
#df -k | grep sda2 >> ./temp/drive_sda2.txt
df -k | grep "/mnt/storage_0" >> . /temp/mnt_storage_0 .txt
df -k | grep "/mnt/storage_pic" >> . /temp/mnt_storage_pic .txt
time =` date +%m "." %d " " %k ":" %M`
connect=` netstat -na | grep "219.238.148.30:80" | wc -l`
echo "$time $connect" >> . /temp/connect_count .txt
3、监控主机的磁盘空间，当使用空间超过90％就通过发mail来发警告
#!/bin/bash
#monitor available disk space
SPACE= 'df | sed -n ' / \ / $ / p ' | gawk ' {print $5} ' | sed ' s/% // '
if [ $SPACE - ge 90 ]
then
fty89@163.com
fi
4、 监控CPU和内存的使用情况
#!/bin/bash
#script to capture system statistics
OUTFILE= /home/xu/capstats .csv
DATE= 'date +%m/%d/%Y'
TIME= 'date +%k:%m:%s'
TIMEOUT= 'uptime'
VMOUT= 'vmstat 1 2'
USERS= 'echo $TIMEOUT | gawk ' {print $4} ' '
LOAD= 'echo $TIMEOUT | gawk ' {print $9} ' | sed "s/,//' '
FREE= 'echo $VMOUT | sed -n ' /[0-9] /p ' | sed -n ' 2p ' | gawk ' {print $4} ' '
IDLE= 'echo $VMOUT | sed -n ' /[0-9] /p ' | sed -n ' 2p ' |gawk ' {print $15} ' '
echo "$DATE,$TIME,$USERS,$LOAD,$FREE,$IDLE" >> $OUTFILE
5、全方位监控主机
#!/bin/bash
# check_xu.sh
# 0 * * * * /home/check_xu.sh
DAT= "`date +%Y%m%d`"
HOUR= "`date +%H`"
DIR= "/home/oslog/host_${DAT}/${HOUR}"
DELAY=60
COUNT=60
# whether the responsible directory exist
if ! test -d ${DIR}
then
/bin/mkdir -p ${DIR}
fi
# general check
export TERM=linux
/usr/bin/top -b -d ${DELAY} -n ${COUNT} > ${DIR} /top_ ${DAT}.log 2>&1 &
# cpu check
/usr/bin/sar -u ${DELAY} ${COUNT} > ${DIR} /cpu_ ${DAT}.log 2>&1 &
#/usr/bin/mpstat -P 0 ${DELAY} ${COUNT} > ${DIR}/cpu_0_${DAT}.log 2>&1 &
#/usr/bin/mpstat -P 1 ${DELAY} ${COUNT} > ${DIR}/cpu_1_${DAT}.log 2>&1 &
# memory check
/usr/bin/vmstat ${DELAY} ${COUNT} > ${DIR} /vmstat_ ${DAT}.log 2>&1 &
# I/O check
/usr/bin/iostat ${DELAY} ${COUNT} > ${DIR} /iostat_ ${DAT}.log 2>&1 &
# network check
/usr/bin/sar -n DEV ${DELAY} ${COUNT} > ${DIR} /net_ ${DAT}.log 2>&1 &
#/usr/bin/sar -n EDEV ${DELAY} ${COUNT} > ${DIR}/net_edev_${DAT}.log 2>&1 &
放在crontab里每小时自动执行：
0 * * * * /home/check_xu .sh
这样会在/home/oslog/host_yyyymmdd/hh目录下生成各小时cpu、内存、网络，IO的统计数据。
如果某个时间段产生问题了，就可以去看对应的日志信息，看看当时的主机性能如何。
