阿铭Linux

shell习题-重启tomcat服务

在生产环境中，经常遇到tomcat无法彻底关闭，也就是说用tomcat自带shutdown.sh脚本无法将java进程完全关掉。所以，需要借助shell脚本，将进程杀死，然后再启动。

写一个shell脚本，实现上述功能。彻底杀死一个进程的命令是 kill -9 pid.

参考答案：

说明：以下脚本为猿课同学实际线上跑的shell脚本，考虑的方面比较多，大家可以学一学他的思路

#!/bin/bash

###功能： 重启 tomcat 进程
###要求：对于tomcat中的某些应用，使用shutdown.sh是无法完全停掉所有服务的 实际操作中都需要kill掉tomcat再重启
##
### root can not run this script.
##

if [ $USER = root ]
then
        echo "root cann't run this script!please run with other user!"
        exit 1
fi

##
### check the Parameter
##

if [[ $# -ne 1 ]]
then
        echo "Usage:$0 tomcatname"
        exit 1
fi

##
### only one process can run one time
##

TMP_FILE_U=/tmp/.tmp.ps.keyword.$USER.956327.txt
#echo $TMP_FILE_U
KEYWORD1="$0"
KEYWORD2="$1"

# 使用赋值会多fork出一个进程,所以要先重定向到一个文本,再统计.

ps ux |grep "$KEYWORD1"|grep "\<$KEYWORD2\>"|grep -v "grep" > $TMP_FILE_U
Pro_count=`cat $TMP_FILE_U |wc -l`
if [ $Pro_count -gt 1 ]
then
        echo "An other process already running ,exit now!"
        exit 1
fi

###################################################
#                                                 #
#               begin of the script               #
#                                                 #
###################################################

##
### set the Parameter
##

TOM=`echo $1|sed 's#/##g'`
TOMCAT_DIRECTORY=~/usr/local/$TOM
STARTUP_SCRIPT=$TOMCAT_DIRECTORY/bin/startup.sh
TOMCAT_LOG=$TOMCAT_DIRECTORY/logs/catalina.out
CONF_FILE=$TOMCAT_DIRECTORY/conf/server.xml
TEMPFILE=/tmp/.tmpfile.x.89342.c4r3.tmp

##
### check if the tomcat directory exist
##

if [ ! -d "$TOMCAT_DIRECTORY" ]
then
        echo "the tomcat \"$TOM\" not exist.check again!"
        exit 1
fi

##
### log roteta and delete log one week ago
##

rotate_log(){
TIME_FORMART=$(date +%Y%m%d%H%M%S)
LOG_DIR=$(dirname $TOMCAT_LOG)
mv $TOMCAT_LOG ${TOMCAT_LOG}_${TIME_FORMART}
find $LOG_DIR -type f -ctime +7 -exec rm -rf {} \;
}

##
### function start the tomcat
##

start_tomcat()
{
#echo start-tomcat-func
if [ -x  "$STARTUP_SCRIPT" ]
then
      
        rotate_log
        $STARTUP_SCRIPT
        sleep 1
        tail -f $TOMCAT_LOG
else
        if [ -e $STARTUP_SCRIPT ]
        then
                chmod +x $STARTUP_SCRIPT
#               echo "permition added!"
                if [ -x  "$STARTUP_SCRIPT" ]
                then
                      
                        rotate_log
                        $STARTUP_SCRIPT
                        sleep 1
                        tail -f $TOMCAT_LOG
                else
                        echo "The script not have excute permision,Couldn't add permision to Script!"
                        exit 1
                fi
        else
                echo "error,the script \"startup.sh\" not exist!"
                exit 1
        fi
fi
}

##
### function stop the tomcat
##

stop_tomcat()
{
rm -rf $TEMPFILE
ps ux |grep /$TOM/ |grep -v "grep /$TOM/"|grep java > $TEMPFILE
Pro_Count=`cat $TEMPFILE|wc -l`
PIDS=`cat $TEMPFILE|awk '{print $2}'`
rm -rf $TEMPFILE
#echo $Pro_Count

if [ $Pro_Count -eq 0 ]
then
        echo "The tomcat not running now!"
else
        if [ $Pro_Count -ne 1 ]
        then
                echo "The have $Pro_Count process running,killed!"
                kill -9 `echo $PIDS`
                WC=`ps aux | grep "/$TOM/" | grep -v "grep /$TOM/" | grep java |wc -l`
                [ $WC -ne 0 ] && (echo "kill process failed!";exit 1)
        else
                echo "Process killed!"
                kill -9 `echo $PIDS`
                WC=`ps aux | grep "/$TOM/" | grep -v "grep /$TOM/" | grep java |wc -l`
                [ $WC -ne 0 ] && (echo "kill process failed!";exit 1)
        fi
fi
}

###########################
####                   ####
####  The main script  ####
####                   ####
###########################

echo -e "are you sure restart $TOM?(y or n)"
read ANS
if [ "$ANS"a != ya ]
then
   echo -e "bye! \n"
   exit 1
fi

stop_tomcat
echo "start tomcat ..."
sleep 2
start_tomcat
# end