#!/bin/bash
#獲取內存情況
mem_total=`free | awk 'NR==2{print $2}'` #獲取內存總大小
mem_use=`free  | awk 'NR==2{print $3}'` #獲取內存使用大小
#統(tǒng)計內存使用率 (使用大小/總大小)
mem_use_rate=`awk 'BEGIN{print('$mem_use'/'$mem_total')*100}'| awk '{print int($0)}'`
#echo $mem_use_rate ----------
#獲取磁盤使用率
disk_use_rate_str=`df -h | grep /dev/vda1 | awk -F '[ %]+' '{print $5}'| awk '{print int($0)}'`
#獲取cpu使用率
cpu_use_rate=`top -n 1 | grep Cpu |awk '{print $2}'| awk '{print int($0)}'`
#報警時間
file_log=/home/error.log  #提前創(chuàng)建
now_time=`date '+%F %T'`
function send_mail(){
}

function check(){
  if [[ "men_use_rate" > 50 ]] || [[ "disk_use_rate" > 50 ]] || [[ "cpu_use_rate" > 50 ]];then
 echo "報警時間："$now_time > $file_log
 echo "cpu使用率:${cpu_use_rate}% --> 磁盤使用率：${disk_use_rate}% --> 內存使用率：${men_use_rate}%"
 send_mail
  fi
}
function main(){
  check
}
main

#!/bin/bash
var1=20
var2=3.14159
var3=`echo "scale=0;$var2 - $var1 " | bc`
echo $var3
var4=`echo "$var1 < $var2"|bc`
echo $var4

ps auxw|head -1;ps auxw|sort -rn -k4|head -40

#!/bin/bash
now=`date -u -d"+8 hour" +'%Y-%m-%d %H:%M:%S'`
#cpu使用閾值
cpu_warn='85'
#mem空閑閾值
mem_warn='1000'
#disk使用閾值
disk_warn='90'
#---cpu
item_cpu () {
cpu_idle=`top -b -n 1 | grep Cpu | awk '{print $8}'|cut -f 1 -d "."`
cpu_use=`expr 100 - $cpu_idle`
echo "$now 當前cpu使用率為 $cpu_use" >> /tmp/monitoring.log
if [ $cpu_use -gt $cpu_warn ]
 then
  echo "cpu warning!!!"
 else
  echo "cpu ok!!!"
fi
}
#---mem
item_mem () {
#MB為單位
mem_free=`free -m | grep "Mem" | awk '{print $4+$6}'`
echo "$now 當前內存剩余空間為 ${mem_free}MB" >> /tmp/monitoring.log
if [ $mem_free -lt $mem_warn  ]
 then
  echo "mem warning!!!"
 else
  echo "mem ok!!!"
 
fi
}
#---disk
item_disk () {
disk_use=`df -P | grep /dev/vda2 | grep -v -E '(tmp|boot)' | awk '{print $5}' | cut -f 1 -d "%"`
echo "$now 當前磁盤使用率為 $disk_use" >> /tmp/monitoring.log
if [ $disk_use -gt $disk_warn ]
 then
  echo "disk warning!!!"
 else
  echo "disk ok!!!"
  
fi

}
item_cpu
item_mem
item_disk

#!/bin/bash
#
total=$(free -m | sed -n '2p' | awk '{print $2}')
used=$(free -m | sed -n '2p' | awk '{print $3}')
free=$(free -m | sed -n '2p' | awk '{print $4}')
shared=$(free -m | sed -n '2p' | awk '{print $5}')
buff=$(free -m | sed -n '2p' | awk '{print $6}')
cached=$(free -m | sed -n '2p' | awk '{print $7}')
rate=`echo "scale=2;$used/$total" | bc | awk -F. '{print $2}'`
echo -e "total\tused\tfree\tshared\tbuffer\tavailable"
echo -e "${total}M\t${used}M\t${free}M\t${shared}M\t${buff}M\t${cached}M\nrate:${rate}%"
if [ $rate -ge 80 ]
then echo "Memory Warn"
 ps aux | grep -v USER | sort -rn -k4 | head
fi

#!/bin/bash
#
DEV=`df -hP | grep '^/dev/*' | cut -d' ' -f1 | sort`
for I in $DEV
do dev=`df -Ph | grep $I | awk '{print $1}'`
size=`df -Ph | grep $I | awk '{print $2}'`
used=`df -Ph | grep $I | awk '{print $3}'`
free=`df -Ph | grep $I | awk '{print $4}'`
rate=`df -Ph | grep $I | awk '{print $5}'`
mount=`df -Ph | grep $I | awk '{print $6}'`
echo -e "$I:\tsize:$size\tused:$used\tfree:$free\trate:$rate\tmount:$mount"
F=`echo $rate | awk -F% '{print $1}'`
if [ $F -ge 80 ]；then
 echo "$mount Warn"
 else echo "It's OK"
fi
done