linux下visualVMware JVM监控配置

1.安装openjdk

centos:yum install java-1.8.0-openjdk java-1.8.0-openjdk-devel

执行以上命令时，提示：
[root@37_201_test opt]# yum install java-1.8.0-openjdk
There was a problem importing one of the Python modules
required to run yum. The error leading to this problem was:

   No module named yum

Please install a package which provides this module, or
verify that the module is installed correctly.

It's possible that the above module doesn't match the
current version of Python, which is:
2.7.6 (default, Sep 21 2017, 11:22:35) 
[GCC 4.4.7 20120313 (Red Hat 4.4.7-16)]

If you cannot solve this problem yourself, please go to 
the yum faq at:
  http://yum.baseurl.org/wiki/Faq

原因：
yum就基于python的，升级python后，yum与高版本的python不兼容，导致yum无法使用

解决办法：
vim /usr/bin/yum
把   ：#/usr/bin/python
改为：#/usr/bin/python2.6
即可

　　

2.

# cd /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.31-1.b13.el6_6.x86_64/jre/lib/management/
# cp jmxremote.password.template jmxremote.password
# chmod 644 jmxremote.password
# vi jmxremote.password
monitorRole  QED      
controlRole   R&D

3.jstatd以守护进程启动

# jstatd -J-Djava.rmi.server.hostname=172.28.37.200 &
[1] 8601
# Could not create remote object
access denied ("java.util.PropertyPermission" "java.rmi.server.ignoreSubClasses" "write")
java.security.AccessControlException: access denied ("java.util.PropertyPermission" "java.rmi.server.ignoreSubClasses" "write")
	at java.security.AccessControlContext.checkPermission(AccessControlContext.java:472)
	at java.security.AccessController.checkPermission(AccessController.java:884)
	at java.lang.SecurityManager.checkPermission(SecurityManager.java:549)
	at java.lang.System.setProperty(System.java:792)
	at sun.tools.jstatd.Jstatd.main(Jstatd.java:139)　　

　　解决：

#cd /home/jdk-1.8/bin
#vim jstatd.all.policy    

grant codebase "file:${java.home}/../lib/tools.jar" {
permission java.security.AllPermission;
 };

保存
#jstatd -J-Djava.security.policy=jstatd.all.policy -J-Djava.rmi.server.hostname=172.28.37.200 &

4.在windows的java_home/bin下，打开jvisualvm.exe

 

如图，显示CPU不受JVM支持，需要建立jvm链接

tomcat下，修改、增加JVM参数

# cd /root/apache-tomcat-8.0.17/bin
# vi catalina.sh   #找到JAVA_OPTS，在下面添加，添加的位置并没要要求

JAVA_OPTS="$JAVA_OPTS-Dcom.sun.management.jmxremote 
        -Dcom.sun.management.jmxremote.port=9999 
        -Dcom.sun.management.jmxremote.authenticate=false 
        -Dcom.sun.management.jmxremote.ssl=false 
        -Djava.rmi.server.hostname=172.28.37.200"
# ./startup.sh 
# netstat -antp |grep 9999    #查看端口是否监听

dubbo服务，修改或增加JVM参数

# vim service.sh

JAVA_OPTS="$JAVA_OPTS-Dcom.sun.management.jmxremote 
        -Dcom.sun.management.jmxremote.port=9999 
        -Dcom.sun.management.jmxremote.authenticate=false 
        -Dcom.sun.management.jmxremote.ssl=false 
        -Djava.rmi.server.hostname=172.28.37.200"

重启后查看端口监听

# netstat -antp |grep 9999    #查看端口是否监听　　

重启后，CPU监控已出现