Use of jvisualvm

jvisualvm Use

VisuaIVM(All-in-One Java Troubleshooting Tool) It's a free one , Integrated multiple JDK Visualization tools for command line tools , It provides powerful analytical capabilities , Yes Java Application performance analysis and tuning . These functions include generating and analyzing massive data 、 Tracking memory leaks 、 Monitor the garbage collector 、 Execution memory and CPU analysis , At the same time, it also supports MBeans Browse and operate on . It is by far the most powerful operation monitoring and fault handling tool .

1、Windows Monitor the local JVM

1.1、 First you need to configure JAVA Environmental Science

1.2、 Get into jvisualvm Catalog , route ：%JAVA_HOME%/bin Below jvisualvm, double-click jvisualvm.exe, Popup page

 1.3、 In the interface above ” Local ” in , Select the to be monitored JAVA process , Click to connect

monitor : It shows the current system CPU、 Memory 、 Usage of resources related to classes and threads . among " Pile up dump" You can view the detailed status of the heap , Including the overview of the heap , All classes inside , You can also click into a specific class to view the status of this class .

Threads ： It can display the name and running status of the thread , It is necessary to debug multiple threads , And you can click a thread to see the detailed running status of this thread

2、 Remote monitoring JVM(Tomcat Example )

remote server ：centos7    middleware ：Tomcat

3.1、 Server side Tomcat To configure

1、Tomcat Of catalina.sh Need configuration , restart tomcat

JAVA_OPTS="$JAVA_OPTS  -Djava.rmi.server.hostname=10.1.1.145" JAVA_OPTS="$JAVA_OPTS  -Dcom.sun.management.jmxremote.port=9000" JAVA_OPTS="$JAVA_OPTS  -Dcom.sun.management.jmxremote.rmi.port=9000" JAVA_OPTS="$JAVA_OPTS  -Dcom.sun.management.jmxremote.ssl=false" JAVA_OPTS="$JAVA_OPTS  -Dcom.sun.management.jmxremote.authenticate=false"

remarks

JAVA_OPTS="$JAVA_OPTS  -Djava.rmi.server.hostname=10.1.1.145"   // Appoint jconsole Connected IP

JAVA_OPTS="$JAVA_OPTS  -Dcom.sun.management.jmxremote.port=9000" // Appoint jconsole Connection port

JAVA_OPTS="$JAVA_OPTS  -Dcom.sun.management.jmxremote.rmi.port=9000"  // This sentence must be added , You cannot succeed without adding

JAVA_OPTS="$JAVA_OPTS  -Dcom.sun.management.jmxremote.ssl=false"  // close ssl authentication

JAVA_OPTS="$JAVA_OPTS -Dcom.sun.management.jmxremote.authenticate=false"  // close User password authentication

other jar Package application , Add... To the startup file ：

nohup java -Djava.rmi.server.hostname=10.1.1.145  -Dcom.sun.management.jmxremote.port=9000 -Dcom.sun.management.jmxremote.rmi.port=9000 -Dcom.sun.management.jmxremote.ssl=false  -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.authenticate=false -jar    xxx.jar &

2、 modify /etc/hosts

Comment out 127.0.0.1  

newly added ：10.1.1.145  localhost localhost.localdomain

3、 see 9000 Does the port have

$netstat -ntlp

4、jvisualvm monitor

Click on ” file ”, choice “ add to JMX Connect ”

 

 

jvisualvm Access with a password

1、 Modify in the server configuration :authenticate=true

   -Dcom.sun.management.jmxremote.authenticate=true

   -Dcom.sun.management.jmxremote.pwd.file=     // Specify the correct password file

JAVA_OPTS="$JAVA_OPTS  -Djava.rmi.server.hostname=10.1.1.145" JAVA_OPTS="$JAVA_OPTS  -Dcom.sun.management.jmxremote.port=9000" JAVA_OPTS="$JAVA_OPTS  -Dcom.sun.management.jmxremote.rmi.port=9000" JAVA_OPTS="$JAVA_OPTS  -Dcom.sun.management.jmxremote.ssl=false" JAVA_OPTS="$JAVA_OPTS  -Dcom.sun.management.jmxremote.authenticate=true" JAVA_OPTS="$JAVA_OPTS  -Dcom.sun.management.jmxremote.pwd.file=/home/cg/java/jdk1.8.0_221/jre/lib/management/jmxremote.password"

2、 take Jdk/jre/lib/management Under the jmxremote.password.template, A copy is called jmxremote.password. Go in and delete all the contents , Add a row

monitorRole  123456   //（ user name , password ）

controlRole   123456  //（ user name , password ）

remarks ：monitorRole   and monitorRole   The user is already jmxremote.access To configure ( Templates )

3、 take jmxremote.password and jmxremote.access Change to 600 jurisdiction , And the user of the program

chmod 600 jmxremote.access  jmxremote.password

4、jvisualvm Use user name and password to access ( for example ：controlRole/123456)

  Because it is not configured SSL, So here is

Normal monitoring :

other ： If you do not enter the user name and password , The user name and password required will pop up automatically

 

 

Reference resources :https://www.jianshu.com/p/0308983dc04c

https://blog.csdn.net/qq_23986927/article/details/113242408