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。