Linux shell脚本实现CPU预警

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 percentcpu_idle=`top -b -d 1 -n 2 | grep Cpu | awk "NR>1{print $5}" | cut -f 1 -d "."` if [ -d "/opt/scripts/log" ]thencd /opt/scriptselsemkdir /opt/scripts/logfi count=0condition=truewhile conditiondoif [ $cpu_idle -le 20 ]thenpids=`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 donedonefor pid in $pidsdo date=`date +%Y%m%d%H%M` jmap -heap $pid > log/heap_$pid_$date.logdonecount++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=0fielsecondition=falsecount=0fidone

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