几个常用的Linux监控脚本

原文: http://turbomailtt.blog.51cto.com/934223/521336

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

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

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
    ...
fi

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

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。