Linux下使用shutdown.sh脚本关闭tomcat无法使得JVM关闭

原文：http://blog.youkuaiyun.com/u014137486/article/details/54381249

Linux下使用shutdown.sh脚本关闭tomcat无法使得JVM关闭

 

近日在Linux中部署项目时发现服务无法启动，上一次出现这种问题是kill掉了相关进程，但是并未分析原因，这次又出现了这个问题，于是便分析了一下，分析的基本原因如下：

通过shutdown.sh脚本关闭tomcat时无法关闭JVM进程，导致JVM进程越来越多，占据了大量的内存空间，使得新程序在启动JVM时由于内存不够用而无法启动。

以前的做法是使用命令kill掉占据的无用进程，我在改写了一下tomcat关闭脚本，每次在通过shutdown.sh脚本关闭tomcat时都会强制kill掉所有相关进程，如下：

说明：笔者改写了tomcat bin目录下的catalina.sh文件中的stop部分，因为在关闭tomcat时，会匹配stop if语句，因此笔者便在该模块最后添加了kill进程的语句，

elif [ "$1" = "stop" ] ; then     shift     SLEEP=5   if [ ! -z "$1" ]; then     echo $1 | grep "[^0-9]" >/dev/null 2>&1     if [ $? -gt 0 ]; then       SLEEP=$1       shift     fi   fi     FORCE=0   if [ "$1" = "-force" ]; then     shift     FORCE=1   fi     if [ ! -z "$CATALINA_PID" ]; then     if [ -f "$CATALINA_PID" ]; then       if [ -s "$CATALINA_PID" ]; then         kill -0 `cat "$CATALINA_PID"` >/dev/null 2>&1         if [ $? -gt 0 ]; then           echo "PID file found but no matching process was found. Stop aborted."           exit 1         fi       else         echo "PID file is empty and has been ignored."       fi     else       echo "\$CATALINA_PID was set but the specified file does not exist. Is Tomcat running? Stop aborted."       exit 1     fi   fi     eval "\"$_RUNJAVA\"" $LOGGING_MANAGER $JAVA_OPTS \     -Djava.endorsed.dirs="\"$JAVA_ENDORSED_DIRS\"" -classpath "\"$CLASSPATH\"" \     -Dcatalina.base="\"$CATALINA_BASE\"" \     -Dcatalina.home="\"$CATALINA_HOME\"" \     -Djava.io.tmpdir="\"$CATALINA_TMPDIR\"" \     org.apache.catalina.startup.Bootstrap "$@" stop     # stop failed. Shutdown port disabled? Try a normal kill.   if [ $? != 0 ]; then     if [ ! -z "$CATALINA_PID" ]; then       echo "The stop command failed. Attempting to signal the process to stop through OS signal."       kill -15 `cat "$CATALINA_PID"` >/dev/null 2>&1     fi   fi     if [ ! -z "$CATALINA_PID" ]; then     if [ -f "$CATALINA_PID" ]; then       while [ $SLEEP -ge 0 ]; do         kill -0 `cat "$CATALINA_PID"` >/dev/null 2>&1         if [ $? -gt 0 ]; then           rm -f "$CATALINA_PID" >/dev/null 2>&1           if [ $? != 0 ]; then             if [ -w "$CATALINA_PID" ]; then               cat /dev/null > "$CATALINA_PID"               # If Tomcat has stopped don't try and force a stop with an empty PID file               FORCE=0             else               echo "The PID file could not be removed or cleared."             fi           fi           echo "Tomcat stopped."           break         fi         if [ $SLEEP -gt 0 ]; then           sleep 1         fi         if [ $SLEEP -eq 0 ]; then           echo "Tomcat did not stop in time."           if [ $FORCE -eq 0 ]; then             echo "PID file was not removed."           fi           echo "To aid diagnostics a thread dump has been written to standard out."           kill -3 `cat "$CATALINA_PID"`         fi         SLEEP=`expr $SLEEP - 1 `       done     fi   fi     KILL_SLEEP_INTERVAL=5   if [ $FORCE -eq 1 ]; then     if [ -z "$CATALINA_PID" ]; then       echo "Kill failed: \$CATALINA_PID not set"     else       if [ -f "$CATALINA_PID" ]; then         PID=`cat "$CATALINA_PID"`         echo "Killing Tomcat with the PID: $PID"         kill -9 $PID         while [ $KILL_SLEEP_INTERVAL -ge 0 ]; do             kill -0 `cat "$CATALINA_PID"` >/dev/null 2>&1             if [ $? -gt 0 ]; then                 rm -f "$CATALINA_PID" >/dev/null 2>&1                 if [ $? != 0 ]; then                     if [ -w "$CATALINA_PID" ]; then                         cat /dev/null > "$CATALINA_PID"                     else                         echo "The PID file could not be removed."                     fi                 fi                 echo "The Tomcat process has been killed."                 break             fi             if [ $KILL_SLEEP_INTERVAL -gt 0 ]; then                 sleep 1             fi             KILL_SLEEP_INTERVAL=`expr $KILL_SLEEP_INTERVAL - 1 `         done         if [ $KILL_SLEEP_INTERVAL -lt 0 ]; then             echo "Tomcat has not been killed completely yet. The process might be waiting on some system call or might be UNINTERRUPTIBLE."         fi       fi     fi   fi   # Add by afei on 2016-12-09 start   # find pid of /home/test/tomcat ,then kill force PIDS   echo "Force kill PIDS begin:"   ps -ef | grep /home/test/tomcat | grep -v grep | grep -v catalina.sh | awk '{print $2}' | xargs echo   ps -ef | grep /home/test/tomcat | grep -v grep | grep -v catalina.sh | awk '{print $2}' | xargs kill -9   echo "Force kill PIDS end!"   # Add by afei on 2016-12-09 end   elif [ "$1" = "configtest" ] ; then

 

主要是语句“ps -ef | grep /home/test/tomcat | grep -v grep | grep -v catalina.sh |awk '{print $2}' | xargs kill -9”，意思是先根据关键字“/home/test/tomcat”找出匹配的tomcat开启的JVM进程，然后再过滤掉grep进程（执行该条命令的进程）和catalina.sh进程（执行catalina.sh脚本的进程），接着使用awk命令输出“ps -ef”的第二个输出参数信息（即PID），最后使用kill -9强制kill掉相应进程。

 

附录

参考资料：
[1]. http://blog.youkuaiyun.com/u012599988/article/details/44458083

[2]. http://blog.youkuaiyun.com/caicongyang/article/details/40041901

[3]. http://blog.youkuaiyun.com/yohoph/article/details/41947623

[4]. http://vekergu.blog.51cto.com/9966832/1623700

[5]. http://han.guokai.blog.163.com/blog/static/1367182712010731149286/