常用的主机监控shell脚本

1、查看主机网卡流量

 

#!/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

2. 新看到的一则SHELL实现同样的功能

#!/bin/bash
function usage
{
        echo "use ./test_net.sh ethX time"
        echo "$1 is you network interface "
        echo "$2 is the last time!"
        echo "for example: ./test_net.sh eth0 2"
        exit 100
}

if [ $# -lt 2 -o $# -gt 2 ];then
        usage
fi

eth=$1
time=$2

old_inbw=`cat /proc/net/dev | grep $eth | awk -F'[: ]+' '{print $3}'`
old_outbw=`cat /proc/net/dev | grep $eth | awk -F'[: ]+' '{print $11}'`

while true
do
        sleep $time
        new_inbw=`cat /proc/net/dev | grep $eth | awk -F'[: ]+' '{print $3}'`
        new_outbw=`cat /proc/net/dev | grep $eth | awk -F'[: ]+' '{print $11}'`
        inbw=`expr $((($new_inbw-$old_inbw)/$time))`
        outbw=`expr $((($new_outbw-$old_outbw)/$time))`
        echo "$eth: IN:$inbw bytes  OUT:$outbw bytes"
        old_inbw=${new_inbw}
        old_outbw=${new_outbw}
done
exit 0


运行效果：
[root@bogon shell]# ./test_net.sh  eth0 2
eth0: IN:3097 bytes  OUT:50374 bytes
eth0: IN:3158 bytes  OUT:44202 bytes
eth0: IN:2587 bytes  OUT:58932 bytes
eth0: IN:2104 bytes  OUT:51543 bytes

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

[e-mail]

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。