http://www.linuxqd.com下面是我常用的几个Linux系统监控的脚本，大家可以根据自己的情况在进行修改，希望能给大家一点帮助。
1、查看主机网卡流量
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#!/bin/bash
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#network
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#Mike.Xu
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while : ; do
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time=’date +%m”-”%d” “%k”:”%M’
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day=’date +%m”-”%d’
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rx_before=’ifconfig eth0|sed -n “8″p|awk ‘{print $2}’|cut -c7-’
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tx_before=’ifconfig eth0|sed -n “8″p|awk ‘{print $6}’|cut -c7-’
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sleep 2
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rx_after=’ifconfig eth0|sed -n “8″p|awk ‘{print $2}’|cut -c7-’
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tx_after=’ifconfig eth0|sed -n “8″p|awk ‘{print $6}’|cut -c7-’
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rx_result=$[(rx_after-rx_before)/256]
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tx_result=$[(tx_after-tx_before)/256]
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echo “$time Now_In_Speed: “$rx_result”kbps Now_OUt_Speed: “$tx_result”kbps”
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sleep 2
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done
2、系统状况监控
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#!/bin/sh
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#systemstat.sh
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#Mike.Xu
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IP=192.168.1.227
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top -n 2| grep “Cpu” >>./temp/cpu.txt
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free -m | grep “Mem” >> ./temp/mem.txt
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df -k | grep “sda1″ >> ./temp/drive_sda1.txt
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#df -k | grep sda2 >> ./temp/drive_sda2.txt
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df -k | grep “/mnt/storage_0″ >> ./temp/mnt_storage_0.txt
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df -k | grep “/mnt/storage_pic” >> ./temp/mnt_storage_pic.txt
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time=`date +%m”.”%d” “%k”:”%M`
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connect=`netstat -na | grep “219.238.148.30:80″ | wc -l`
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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
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#!/bin/bash
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#monitor available disk space
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SPACE=’df | sed -n ‘/ / $ / p’ | gawk ‘{print $5}’ | sed ’s/%//’
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if [ $SPACE -ge 90 ]
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then
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fty89@163.com
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fi
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4、 监控CPU和内存的使用情况
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#!/bin/bash
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#script to capture system statistics
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OUTFILE=/home/xu/capstats.csv
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DATE=’date +%m/%d/%Y’
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TIME=’date +%k:%m:%s’
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TIMEOUT=’uptime’
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VMOUT=’vmstat 1 2′
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USERS=’echo $TIMEOUT | gawk ‘{print $4}’ ‘
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LOAD=’echo $TIMEOUT | gawk ‘{print $9}’ | sed “s/,//’ ‘
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FREE=’echo $VMOUT | sed -n ‘/[0-9]/p’ | sed -n ‘2p’ | gawk ‘{print $4} ‘ ‘
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IDLE=’echo $VMOUT | sed -n ‘/[0-9]/p’ | sed -n ‘2p’ |gawk ‘{print $15}’ ‘
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echo “$DATE,$TIME,$USERS,$LOAD,$FREE,$IDLE” >> $OUTFILE
5、全方位监控主机
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#!/bin/bash
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# check_xu.sh
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# 0 * * * * /home/check_xu.sh
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DAT=”`date +%Y%m%d`”
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HOUR=”`date +%H`”
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DIR=”/home/oslog/host_${DAT}/${HOUR}”
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DELAY=60
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COUNT=60
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# whether the responsible directory exist
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if ! test -d ${DIR}
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then
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/bin/mkdir -p ${DIR}
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fi
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# general check
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export TERM=linux
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/usr/bin/top -b -d ${DELAY} -n ${COUNT} > ${DIR}/top_${DAT}.log 2>&1 &
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# cpu check
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/usr/bin/sar -u ${DELAY} ${COUNT} > ${DIR}/cpu_${DAT}.log 2>&1 &
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#/usr/bin/mpstat -P 0 ${DELAY} ${COUNT} > ${DIR}/cpu_0_${DAT}.log 2>&1 &
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#/usr/bin/mpstat -P 1 ${DELAY} ${COUNT} > ${DIR}/cpu_1_${DAT}.log 2>&1 &
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# memory check
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/usr/bin/vmstat ${DELAY} ${COUNT} > ${DIR}/vmstat_${DAT}.log 2>&1 &
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# I/O check
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/usr/bin/iostat ${DELAY} ${COUNT} > ${DIR}/iostat_${DAT}.log 2>&1 &
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# network check
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/usr/bin/sar -n DEV ${DELAY} ${COUNT} > ${DIR}/net_${DAT}.log 2>&1 &
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#/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。