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
1.#!/bin/bash
2.
3.#network
4.
5.#Mike.Xu
6.
7.while : ; do
8.
9.time=’date +%m”-”%d” “%k”:”%M’
10.
11.day=’date +%m”-”%d’
12.
13.rx_before=’ifconfig eth0|sed -n “8″p|awk ‘{print $2}’|cut -c7-’
14.
15.tx_before=’ifconfig eth0|sed -n “8″p|awk ‘{print $6}’|cut -c7-’
16.
17.sleep 2
18.
19.rx_after=’ifconfig eth0|sed -n “8″p|awk ‘{print $2}’|cut -c7-’
20.
21.tx_after=’ifconfig eth0|sed -n “8″p|awk ‘{print $6}’|cut -c7-’
22.
23.rx_result=$[(rx_after-rx_before)/256]
24.
25.tx_result=$[(tx_after-tx_before)/256]
26.
27.echo “$time Now_In_Speed: “$rx_result”kbps Now_OUt_Speed: “$tx_result”kbps”
28.
29.sleep 2
30.
31.done
2、系统状况监控
1.#!/bin/sh
2.
3.#systemstat.sh
4.
5.#Mike.Xu
6.
7.IP=192.168.1.227
8.
9.top -n 2| grep “Cpu” >>./temp/cpu.txt
10.
11.free -m | grep “Mem” >> ./temp/mem.txt
12.
13.df -k | grep “sda1″ >> ./temp/drive_sda1.txt
14.
15.#df -k | grep sda2 >> ./temp/drive_sda2.txt
16.
17.df -k | grep “/mnt/storage_0″ >> ./temp/mnt_storage_0.txt
18.
19.df -k | grep “/mnt/storage_pic” >> ./temp/mnt_storage_pic.txt
20.
21.time=`date +%m”.”%d” “%k”:”%M`
22.
23.connect=`netstat -na | grep “219.238.148.30:80″ | wc -l`
24.
25.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
1.#!/bin/bash
2.
3.#monitor available disk space
4.
5.SPACE=’df | sed -n ‘/ / $ / p’ | gawk ‘{print $5}’ | sed ’s/%//’
6.
7.if [ $SPACE -ge 90 ]
8.
9.then
10.
11.fty89@
12.
13.fi
14.
15.4、监控CPU和内存的使用情况
16.
17.#!/bin/bash
18.
19.#script to capture system statistics
20.
21.OUTFILE=/home/xu/capstats.csv
22.
23.DATE=’date +%m/%d/%Y’
24.
25.TIME=’date +%k:%m:%s’
26.
27.TIMEOUT=’uptime’
28.
29.VMOUT=’vmstat 1 2′
30.
ERS=’echo $TIMEOUT | gawk ‘{print $4}’ ‘
32.
33.LOAD=’echo $TIMEOUT | gawk ‘{print $9}’ | sed “s/,//’ ‘
34.
35.FREE=’echo $VMOUT | sed -n ‘/[0-9]/p’ | sed -n ‘2p’ | gawk ‘{print $4} ‘ ‘
36.
37.IDLE=’echo $VMOUT | sed -n ‘/[0-9]/p’ | sed -n ‘2p’ |gawk ‘{print $15}’ ‘
38.
39.echo “$DATE,$TIME,$USERS,$LOAD,$FREE,$IDLE” >> $OUTFILE
5、全方位监控主机
1.#!/bin/bash
2.
3.# check_xu.sh
4.
5.# 0 * * * * /home/check_xu.sh
6.
7.DAT=”`date +%Y%m%d`”
8.
9.HOUR=”`date +%H`”
10.
11.DIR=”/home/oslog/host_${DAT}/${HOUR}”
12.
13.DELAY=60
14.
15.COUNT=60
16.
17.# whether the responsible directory exist
18.
19.if ! test -d ${DIR}
20.
21.then
22.
23./bin/mkdir -p ${DIR}
24.
25.fi
26.
27.# general check
28.
29.export TERM=linux
30.
31./usr/bin/top -b -d ${DELAY} -n ${COUNT} > ${DIR}/top_${DAT}.log 2>&1 &
32.
33.# cpu check
34.
35./usr/bin/sar -u ${DELAY} ${COUNT} > ${DIR}/cpu_${DAT}.log 2>&1 &
36.
37.#/usr/bin/mpstat -P 0 ${DELAY} ${COUNT} > ${DIR}/cpu_0_${DAT}.log 2>&1 &
38.
39.#/usr/bin/mpstat -P 1 ${DELAY} ${COUNT} > ${DIR}/cpu_1_${DAT}.log 2>&1 &
40.
41.# memory check
42.
43./usr/bin/vmstat ${DELAY} ${COUNT} > ${DIR}/vmstat_${DAT}.log 2>&1 &
44.
45.# I/O check
46.
47./usr/bin/iostat ${DELAY} ${COUNT} > ${DIR}/iostat_${DAT}.log 2>&1 &
48.
49.# network check
50.
51./usr/bin/sar -n DEV ${DELAY} ${COUNT} > ${DIR}/net_${DAT}.log 2>&1 &
52.
53.#/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。