Shell监控JVM内存-企业微信群告警

区分JDK版本是16还是非16
jdk16查看内存工具

jhsdb jmap --heap --pid pid

非16版本查看内存工具

jmap -heap pid

脚本文件名：/mnt/disk/app/monitor/jvm_monitor.sh
监控脚本内容

#!/bin/bash
export PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/home/rocketmq/bin:/usr/local/jdk16/bin:/usr/local/git/bin:/usr/local/node/bin:/root/bin
#jdk版本号
jdkVersion=`java -version 2>&1 | sed '1!d' | sed -e 's/"//g' | awk '{print $3}'`

sysdate=`date +"%Y-%m-%d %H:%M:%S" -d now`

for pid in `jps |grep -v Jps|awk '{print $1}'`
do
process_name=$(ps -ef|grep java|grep $pid)

#jvm内存监控
echo -------------------------------------------------
echo 日期:$sysdate
echo JDK版本:$jdkVersion
echo 进程ID:${pid}
echo 进程信息:${process_name}

if [ "$pid" = "" ]
then
	echo "the program is not exists."
	exit 0
fi

if [[ ${jdkVersion} == 16 ]]
then
    heap=$(jhsdb jmap --heap --pid ${pid})
else
    heap=$(jmap -heap ${pid})
fi


G1Heap=`echo ${heap}|sed 's/^.*G1 Heap://g'|sed 's/G1 Young Generation:.*$//g'|awk '{print $16}'|sed 's/%.*$//g'|cut -b 1-6`

G1Old=`echo ${heap}|sed 's/^.*G1 Old Generation://g'|awk '{print $16}'|sed 's/%.*$//g'|cut -b 1-6`

echo "当前JVM堆区使用率:       ${G1Heap}%"
echo "当前JVM老年代堆区使用率:  ${G1Old}%"

G1Heap1=`gawk -v x=$G1Heap -v y=1000 'BEGIN{printf "%.0f\n",x*y}'`
G1Old1=`gawk -v x=$G1Old -v y=1000 'BEGIN{printf "%.0f\n",x*y}'`

#解析IP地址
interIp=$(ip addr | awk '/^[0-9]+: / {}; /inet.*global/ {print gensub(/(.*)\/(.*)/, "\\1", "g", $2)}')

sendMsg=""
if [ ${G1Heap1} -ge "85000" ]
then
sendMsg=${sendMsg}" dev":${interIp}" "PID:${pid}" "JVM堆区使用率:${G1Heap}%超阀值"\n"
fi

if [ ${G1Old1} -ge "85000" ]
then
sendMsg=${sendMsg}" dev"IP:${interIp}" "PID:${pid}" "JVM老年代堆区使用率:${G1Old}%超阀值
fi

if [ -n "${sendMsg}" ]; then
    sendMsg=${sysdate}" "${sendMsg}
    echo "发送消息："$sendMsg
    curl 'https://qyapi.weixin.qq.com/cgi-bin/webhook/send?key=7c07644b-91eb-498c-9a78-045575cc67b8' -H 'Content-Type: application/json' -d "{\"msgtype\": \"text\",\"text\": {\"content\": \"${sendMsg}\",\"mentioned_mobile_list\":[]}}"
fi

done

chmod +x /mnt/disk/app/monitor/jvm_monitor.sh
添加系统任务，每隔3分钟执行一次监控脚本
crontab -e

*/3 * * * * /mnt/disk/app/monitor/jvm_monitor.sh >> /mnt/disk/app/monitor/jvm_monitor.log  2>&1

重新载入配置

service crond reload