JVM系列学习(三)：Tomcat性能监控与调优

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Tomcat性能监控与调优

tomat远程debug ：JDWP协议及实现

1. 配置文件

   • vim /bin/startup.sh

   #!/bin/sh
   
   # Licensed to the Apache Software Foundation (ASF) under one or more
   # contributor license agreements.  See the NOTICE file distributed with
   # this work for additional information regarding copyright ownership.
   # The ASF licenses this file to You under the Apache License, Version 2.0
   # (the "License"); you may not use this file except in compliance with
   # the License.  You may obtain a copy of the License at
   #
   #     http://www.apache.org/licenses/LICENSE-2.0
   #
   # Unless required by applicable law or agreed to in writing, software
   # distributed under the License is distributed on an "AS IS" BASIS,
   # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   # See the License for the specific language governing permissions and
   # limitations under the License.
   
   # -----------------------------------------------------------------------------
   # Start Script for the CATALINA Server
   # -----------------------------------------------------------------------------
   
   # Better OS/400 detection: see Bugzilla 31132
   os400=false
   case "`uname`" in
   OS400*) os400=true;;
   esac
   
   # resolve links - $0 may be a softlink
   PRG="$0"
   
   while [ -h "$PRG" ] ; do
     ls=`ls -ld "$PRG"`
     link=`expr "$ls" : '.*-> \(.*\)$'`
     if expr "$link" : '/.*' > /dev/null; then
       PRG="$link"
     else
       PRG=`dirname "$PRG"`/"$link"
     fi
   done
   
   PRGDIR=`dirname "$PRG"`
   EXECUTABLE=catalina.sh
   
   # Check that target executable exists
   if $os400; then
     # -x will Only work on the os400 if the files are:
     # 1. owned by the user
     # 2. owned by the PRIMARY group of the user
     # this will not work if the user belongs in secondary groups
     eval
   else
     if [ ! -x "$PRGDIR"/"$EXECUTABLE" ]; then
       echo "Cannot find $PRGDIR/$EXECUTABLE"
       echo "The file is absent or does not have execute permission"
       echo "This file is needed to run this program"
       exit 1
     fi
   fi
   
   exec "$PRGDIR"/"$EXECUTABLE" jpda start "$@" ##在这里添加jpda
   

   • 还有一个配置文件 vim /bin/catalina.sh

     搜索JPDA 贴出部分代码
     
     #   JPDA_OPTS       (Optional) Java runtime options used when the "jpda start"
     #                   command is executed. If used, JPDA_TRANSPORT, JPDA_ADDRESS,
     #                   and JPDA_SUSPEND are ignored. Thus, all required jpda
     #                   options MUST be specified. The default is:
     #
     #                   -agentlib:jdwp=transport=$JPDA_TRANSPORT,
     #                       address=$JPDA_ADDRESS,server=y,suspend=$JPDA_SUSPEND
     
     
     if [ "$1" = "jpda" ] ; then
       if [ -z "$JPDA_TRANSPORT" ]; then
         JPDA_TRANSPORT="dt_socket"
       fi
       if [ -z "$JPDA_ADDRESS" ]; then
         ##JPDA_ADDRESS="localhost:8000" 默认8000端口
         JPDA_ADDRESS="54321"这里可以修改自己要的端口
       fi
       if [ -z "$JPDA_SUSPEND" ]; then
         JPDA_SUSPEND="n"
       fi
       if [ -z "$JPDA_OPTS" ]; then
         JPDA_OPTS="-agentlib:jdwp=transport=$JPDA_TRANSPORT,address=$JPDA_ADDRESS,server=y,suspend=$JPDA_SUSPEND"
       fi
       CATALINA_OPTS="$JPDA_OPTS $CATALINA_OPTS"
       shift
     fi
     

   • IDEA中添加Remote,输入IP地址和改的端口号

tomcat-manager监控

1. 文档：{tomcat}/webapps/docs/manager-howto.html

   • conf/tomcat-users.xml 添加用户

     <?xml version="1.0" encoding="UTF-8"?>
     <!--
       Licensed to the Apache Software Foundation (ASF) under one or more
       contributor license agreements.  See the NOTICE file distributed with
       this work for additional information regarding copyright ownership.
       The ASF licenses this file to You under the Apache License, Version 2.0
       (the "License"); you may not use this file except in compliance with
       the License.  You may obtain a copy of the License at
     
           http://www.apache.org/licenses/LICENSE-2.0
     
       Unless required by applicable law or agreed to in writing, software
       distributed under the License is distributed on an "AS IS" BASIS,
       WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
       See the License for the specific language governing permissions and
       limitations under the License.
     -->
     <tomcat-users xmlns="http://tomcat.apache.org/xml"
                   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
                   xsi:schemaLocation="http://tomcat.apache.org/xml tomcat-users.xsd"
                   version="1.0">
     <!--
       NOTE:  By default, no user is included in the "manager-gui" role required
       to operate the "/manager/html" web application.  If you wish to use this app,
       you must define such a user - the username and password are arbitrary. It is
       strongly recommended that you do NOT use one of the users in the commented out
       section below since they are intended for use with the examples web
       application.
     -->
     <!--
       NOTE:  The sample user and role entries below are intended for use with the
       examples web application. They are wrapped in a comment and thus are ignored
       when reading this file. If you wish to configure these users for use with the
       examples web application, do not forget to remove the <!.. ..> that surrounds
       them. You will also need to set the passwords to something appropriate.
     -->
     <!--
       <role rolename="tomcat"/>
       <role rolename="role1"/>
       <user username="tomcat" password="<must-be-changed>" roles="tomcat"/>
       <user username="both" password="<must-be-changed>" roles="tomcat,role1"/>
       <user username="role1" password="<must-be-changed>" roles="role1"/>
     -->
       <role rolename="tomcat"/>
       <role rolename="manager-status"/>
       <role rolename="manager-gui"/>
       <user username="tomcat" password="123456" roles="tomcat,manager-gui,manager-status"/> ##添加用户
     </tomcat-users>
     

   • conf/Catalina/localhost/manager.xml配置允许的远程连接,没有就新建文件夹

     <Context privileged="true" antiResourceLocking="false"
              docBase="${catalina.home}/webapps/manager">
       <Valve className="org.apache.catalina.valves.RemoteAddrValve"
              allow="127\.0\.0\.1" />
     </Context>
     

   • 重启访问127.0.0.7:8080/manager进入界面操作

psi-probe监控：github地址

1. git clone https://github.com/psi-probe/psi-probe.git
2. mvn clean package -Dmaven.test.skip
3. 打成的war包单独放在${Tomcat}/webapps目录下
4. 同样要像上面一样配置tomcat-users.xml，manager.xml的文件
5. 重启访问127.0.0.1:8080/probe
6. 进入页面开始查看
   • 应用的统计信息
   • 请求,session,jsp预编译
   • Threads:线程的内容，相当于jstack
   • System:系统的内存情况