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【Shell】 CPU预警shell脚本

作者:baihan / 发布于2015/2/15/ 931

如果CPU占用率持续达到80以上则调用打印java线程占用率堆栈的脚本，见https://github.com/oldratlee/useful-shells/blob/master/show-busy-java-threads.sh，具体用法见他的github wiki！


	#!/bin/bash
	#cpu idle percent
	cpu_idle=`top -b -d 1 -n 2 | grep Cpu | awk 'NR>1{print $5}' | cut -f 1 -d "."`
	
	if [ -d "/opt/scripts/log" ]
	then
	 cd /opt/scripts
	else
	 mkdir /opt/scripts/log
	fi
	
	count=0
	condition=true
	while condition
	do
	 if [ $cpu_idle -le 20 ]
	 then
	 pids=`top -b -d 1 -n 1 | grep java | awk '{if($9 > 80) print $1}'`
	 for ((a = 1; a < 10; a++))
	 do
	 for pid in $pids
	 doi
	 #involve jdk existence check later
	 date=`date +%Y%m%d%H%M`
	 sh showstack.sh -c 30 -p $pid > log/stack_$pid_$date.log
	 jstat -gcutil $pid > log/gc_$pid_$date.log
	 done
	 done
	 for pid in $pids
	 do
	 date=`date +%Y%m%d%H%M`
	 jmap -heap $pid > log/heap_$pid_$date.log
	 done
	 count++
	 cpu_idle=`top -b -d 1 -n 2 | grep Cpu | awk 'NR>1{print $5}' | cut -f 1 -d "."`
	 if [ $count -ge 3]
	 then
	 #send emaili
	 #server ip address
	 ip=`ifconfig eth0 | grep "inet addr" | cut -f 2 -d ":" | cut -f 1 -d " "`
	 condition=false
	 count=0
	 fi
	 else
	 condition=false
	 count=0
	 fi
	done

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　CPU预警　

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