一个根据内存使用情况重启tomcat的小脚本

    有一台服务器上部署了tomcat，随着时间的推移，内存消耗越来越大，所以写了一个小脚本配合crontab定时检测内存，不足的情况下重启tomcat。

#!/bin/bash

#tomcat restart:out of memory

LOG=./restart_tomcat.log

TOMCAT=/tomcat/bin/

TOMCATDIR=/tomcat

echo"----------------------------" >> $LOG

mem_total=$(free -m |grep Mem|awk ‘{print$2}‘)

mem_used=$(free -m|grep -|awk ‘{print $3}‘)

mem_rate=$(echo "scale=4;$mem_used /$mem_total" | bc)

percent_part1=$(echo $mem_rate | cut -c2-3)

percent_part2=$(echo $mem_rate | cut -c4-5)

/usr/bin/free -m  >>$LOG

echo "System memery is already use:$percent_part1.$percent_part2%"| tee -a $LOG

if (( percent_part1  >= 90 ));

then

         echo"----------------------------" >> $LOG;

         date  | tee -a $LOG;

         bash$TOMCATDIR/checktomcat | tee -a $LOG;

         sleep5;

         echo"----------------------------" >> $LOG;

         date  | tee -a $LOG;

         echo"kill java" >>$LOG;

         killall  java | tee -a $LOG;

         sleep5;

         echo"----------------------------" >> $LOG;

         netstat-anptul|grep :80 |grep LISTEN| tee -a $LOG;

         echo"----------------------------" >> $LOG;

         date  | tee -a $LOG;

         echo"start tomcat" >>$LOG;

         bash$TOMCAT/startup.sh | tee -a $LOG;

         sleep10;

         echo"----------------------------" >> $LOG;

         date  | tee -a $LOG;

         bash$TOMCATDIR/checktomcat | tee -a $LOG;

         netstat-anptul|grep :80 |grep LISTEN| tee -a $LOG;

         sleep5;

else

         date>>$LOG;

         echo"The server is very good."| tee -a $LOG;

fi;

exit 0

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原文：http://zhangdj.blog.51cto.com/9210512/1880090