增加服务器监控

1、脚本文件monitor.sh

#!/bin/bash
PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin:/usr/java/default/bin:~/bin
export PATH

cmsFraction=90
warningFgcTimes=10
warningMsg=""
warningMsgPre=""
LOG_DIR="/opt/logs/monitor"

#发送报警邮件方法
function sendEmail {
    from="[email protected]"
    to="****@qq.com"
    cc="****@qq.com"
    subject="* 139 Memory Warning *"
    if [ -n "$warningMsg" ]; then
        #上一次邮件发送时间
        latestMailTime=`cat $LOG_DIR/lmail 2>/dev/null`
        now=`date +%s`
        if [ -z "$latestMailTime" ] || [ $(echo "$now - $latestMailTime > 60*30" | bc) = 1 ]; then
            warningMsg=$warningMsgPre"\n\n"$warningMsg
            echo -e "Error:"$warningMsg
            echo -e "From:$from\nTo:$to\nCC:$cc\nSubject:$subject\n\n$warningMsg" | sendmail -t
            echo $now > $LOG_DIR/lmail
        fi
    fi
}

#获取order-site的进程号
orderSitePid=`ps -ef|grep outstock-web|grep com.caucho.server.resin.Resin|gawk '{print $2}'`
if [ -z "$orderSitePid" ]; then
    warningMsg="order-site process does not exist!\n"
    warningMsgPre="1(null),"
    sendEmail
    exit 0
fi

#获取heap使用情况
gcUtils=(`jstat -gcutil $orderSitePid | sed -n '2p' | gawk '{print $3, $4, $8}'`)
edenPercent=${gcUtils[0]}
oldPercent=${gcUtils[1]}
fgc=${gcUtils[2]}

prevOldPercent=`cat $LOG_DIR/old 2>/dev/null`
prevFgc=`cat $LOG_DIR/fgc 2>/dev/null`

if [ $(echo "$oldPercent > $cmsFraction" | bc) = 1 ]; then
    if [ -n "$prevOldPercent" ] && [ $(echo "$prevOldPercent > $cmsFraction" | bc) = 1 ]; then
        #如果当前老年代内存使用超过70%，并且前一次统计内存时也超过了70%，说明老年代处于饱和，内存要不够用了
        warningMsg=$warningMsg"Memory of the Old Generation lasted over "$cmsFraction"%!\n"
        warningMsgPre=$warningMsgPre"2($oldPercent),"
    fi
fi
if [ -n "$prevFgc" ] && [ $(echo "$fgc - $prevFgc > $warningFgcTimes" | bc) = 1 ]; then
    #如果老年代gc次数比前一次统计时增长了10次，说名老年代gc太频繁，程序要卡顿了
    warningMsg=$warningMsg"The FGC times ware too frequent!"
    warningMsgPre=$warningMsgPre"3($fgc)"
fi

sendEmail

echo $oldPercent > $LOG_DIR/old
echo $fgc > $LOG_DIR/fgc
echo -n "--";date "+%Y-%m-%d %H:%M:%S"
jstat -gcutil $orderSitePid
echo ""

2、上传到linux服务器，如果执行不了，注意使用dos2unix 命令将dos文件转换为unix文件

yum install dos2unix
dos2unix order_monitor.sh

3、新建monitor文件夹

/opt/logs/monitor 放日志

/opt/script/monitor 放脚本文件

4、增加1分钟计划执行

*/1 * * * * sh /opt/script/monitor/order_monitor.sh 1>>/opt/logs/monitor/stdout.log 2>>/opt/logs/monitor/stderr.log

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