jmx

最新推荐文章于 2021-03-15 17:57:26 发布

最新推荐文章于 2021-03-15 17:57:26 发布 · 122 阅读

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JMX监控Tomcat 收藏

环境：Tomcat5.5、jdk6

1、先配Tomcat的启动语句，window下tomcat的bin/catalina.bat（linux为catalina.sh），在头上注释部分（.bat为rem、.sh为#）后面加上set JAVA_OPTS=-Dcom.sun.management.jmxremote.port=8999 -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.authenticate=true

(linux为JAVA_OPTS=-Dcom.sun.management.jmxremote.port=8999 -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.authenticate=true)

2、修改jmx远程访问授权。默认为JAVA_HOME/jre/lib/management下jmxremote.access、jmxremote.password（缺省系统提供了个模版jmxremote.password.template改下名就成）

注意：linux下需要该权限，chmod 600 jmxremote.access, chmod 600 jmxremote.password

window下特麻烦，现需要jdk装在NTFS文件系统下，选中文件，点右键“属性”-〉安全，点“高级”，去掉“从父项继承....”，弹出窗口中选“删除”，这样删除了所有访问权限。再选“添加”-〉高级，“立即查找”，选中你的用户，例administrator，点“确定"，“确定"。来到权限窗口，勾选"完全控制"，点"确定"，OK了。

3、用jconsole连接远程linux服务时, IP地址和port都输入正确的情况下,仍然是连接失败

vi /etc/hosts，将hostname对应的IP改为真实IP

4、测试JMX。启动tomcat，在window“命令行窗口”中输入netstat -an看下8999端口打开没有。若没有，则前面没配对。若已打开，则可在另一台机器的“命令行窗口”中输入jconsole，打开jdk自带的jmx客户端。选远程连接，录入tomcat所在机器的IP，端口例192.168.10.10:8999，帐号、密码在jmxremote.password中，如帐号controlRole，密码R&D（缺省monitorRole只能读，controlRole能读写，jmxremote.access中可配置）。点“连接”。看到图就行了。

5、关于数据。Mbean属性页中给出了相应的数据，Catalina中是tomcat的，java.lang是jvm的。对于加粗的黑体属性值，需双击一下才可看内容

5、关于编程。

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public class JMXTest {

/**

* @param args

public static void main(String[] args) {

try {

String jmxURL = "service:jmx:rmi:///jndi/rmi://192.168.10.93:8999/jmxrmi";//tomcat jmx url

JMXServiceURL serviceURL = new JMXServiceURL(jmxURL);

Map map = new HashMap();

String[] credentials = new String[] { "monitorRole" , "QED" };

map.put("jmx.remote.credentials", credentials);

JMXConnector connector = JMXConnectorFactory.connect(serviceURL, map);

MBeanServerConnection mbsc = connector.getMBeanServerConnection();

//端口最好是动态取得

ObjectName threadObjName = new ObjectName("Catalina:type=ThreadPool,name=http-8080");

MBeanInfo mbInfo = mbsc.getMBeanInfo(threadObjName);

String attrName = "currentThreadCount";//tomcat的线程数对应的属性值

MBeanAttributeInfo[] mbAttributes = mbInfo.getAttributes();

System.out.println("currentThreadCount:"+mbsc.getAttribute(threadObjName, attrName));

//heap

for(int j=0;j <mbsc.getDomains().length;j++){

System.out.println("###########"+mbsc.getDomains()[j]);

}

Set MBeanset = mbsc.queryMBeans(null, null);

System.out.println("MBeanset.size() : " + MBeanset.size());

Iterator MBeansetIterator = MBeanset.iterator();

while (MBeansetIterator.hasNext()) {

ObjectInstance objectInstance = (ObjectInstance)MBeansetIterator.next();

ObjectName objectName = objectInstance.getObjectName();

String canonicalName = objectName.getCanonicalName();

System.out.println("canonicalName : " + canonicalName);

if (canonicalName.equals("Catalina:host=localhost,type=Cluster")) {

// Get details of cluster MBeans

System.out.println("Cluster MBeans Details:");

System.out.println("=========================================");

//getMBeansDetails(canonicalName);

String canonicalKeyPropList = objectName.getCanonicalKeyPropertyListString();

}

//------------------------- system ----------------------

ObjectName runtimeObjName = new ObjectName("java.lang:type=Runtime");

System.out.println("厂商:"+ (String)mbsc.getAttribute(runtimeObjName, "VmVendor"));

System.out.println("程序:"+ (String)mbsc.getAttribute(runtimeObjName, "VmName"));

System.out.println("版本:"+ (String)mbsc.getAttribute(runtimeObjName, "VmVersion"));

Date starttime=new Date((Long)mbsc.getAttribute(runtimeObjName, "StartTime"));

SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

System.out.println("启动时间:"+df.format(starttime));

Long timespan=(Long)mbsc.getAttribute(runtimeObjName, "Uptime");

System.out.println("连续工作时间:"+JMXTest.formatTimeSpan(timespan));

//------------------------ JVM -------------------------

//堆使用率

ObjectName heapObjName = new ObjectName("java.lang:type=Memory");

MemoryUsage heapMemoryUsage = MemoryUsage.from((CompositeDataSupport)mbsc.getAttribute(heapObjName, "HeapMemoryUsage"));

long maxMemory = heapMemoryUsage.getMax();//堆最大

long commitMemory = heapMemoryUsage.getCommitted();//堆当前分配

long usedMemory = heapMemoryUsage.getUsed();

System.out.println("heap:"+(double)usedMemory*100/commitMemory+"%");//堆使用率

MemoryUsage nonheapMemoryUsage = MemoryUsage.from((CompositeDataSupport)mbsc.getAttribute(heapObjName, "NonHeapMemoryUsage"));

long noncommitMemory = nonheapMemoryUsage.getCommitted();

long nonusedMemory = heapMemoryUsage.getUsed();

System.out.println("nonheap:"+(double)nonusedMemory*100/noncommitMemory+"%");

ObjectName permObjName = new ObjectName("java.lang:type=MemoryPool,name=Perm Gen");

MemoryUsage permGenUsage = MemoryUsage.from((CompositeDataSupport)mbsc.getAttribute(permObjName, "Usage"));

long committed = permGenUsage.getCommitted();//持久堆大小

long used = heapMemoryUsage.getUsed();//

System.out.println("perm gen:"+(double)used*100/committed+"%");//持久堆使用率

//-------------------- Session ---------------

ObjectName managerObjName = new ObjectName("Catalina:type=Manager,*");

Set<ObjectName> s=mbsc.queryNames(managerObjName, null);

for (ObjectName obj:s){

System.out.println("应用名:"+obj.getKeyProperty("path"));

ObjectName objname=new ObjectName(obj.getCanonicalName());

System.out.println("最大会话数:"+ mbsc.getAttribute( objname, "maxActiveSessions"));

System.out.println("会话数:"+ mbsc.getAttribute( objname, "activeSessions"));

System.out.println("活动会话数:"+ mbsc.getAttribute( objname, "sessionCounter"));

}

//----------------- Thread Pool ----------------

ObjectName threadpoolObjName = new ObjectName("Catalina:type=ThreadPool,*");

Set<ObjectName> s2=mbsc.queryNames(threadpoolObjName, null);

for (ObjectName obj:s2){

System.out.println("端口名:"+obj.getKeyProperty("name"));

ObjectName objname=new ObjectName(obj.getCanonicalName());

System.out.println("最大线程数:"+ mbsc.getAttribute( objname, "maxThreads"));

System.out.println("当前线程数:"+ mbsc.getAttribute( objname, "currentThreadCount"));

System.out.println("繁忙线程数:"+ mbsc.getAttribute( objname, "currentThreadsBusy"));

}

} catch (Exception e) {

e.printStackTrace();

}

public static String formatTimeSpan(long span){

long minseconds = span % 1000;

span = span /1000;

long seconds = span % 60;

span = span / 60;

long mins = span % 60;

span = span / 60;

long hours = span % 24;

span = span / 24;

long days = span;

return (new Formatter()).format("%1$d天 %2$02d:%3$02d:%4$02d.%5$03d", days,hours,mins,seconds,minseconds).toString();

}

本文来自优快云博客，转载请标明出处：http://blog.youkuaiyun.com/airobot008/archive/2009/03/03/3951524.aspx

使用JMX监控Tomcat

在JMX里面，

1，所有的MBean(你把他理解为一个JAVA对象得了)都会被用一个javax.management.ObjectName对象与之相关联。

2，我们可以通过javax.management.MBeanServerConnection取得一个连接，这个连接就是我们访问JAVA对象的代理

3，通过2的连接可以调用注册在MBeanServer上的MBean的方法，以及属性取得。

你所需要做的事情有下面几件：

1，需要把你的Tomcat配置为支持JMX

2，需要获得与Tomcat的javax.management.MBeanServerConnection

3，需要知道“本人的目的，只是要知道tomcat的线程数是不是达到峰值”这件事情是有哪个MBean来提供（也就是找准ObjectName）

4, 需要知道“tomcat的线程数”在你找到的MBean中的属性名

下面对以上四件事情分别对应的做法：

1，打开Tomcat 6.0\bin\tomcat6w,然后在“Java”的“Java Options”下面追加

-Dcom.sun.management.jmxremote

-Dcom.sun.management.jmxremote.port=8050

-Dcom.sun.management.jmxremote.ssl=false

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

语句，特别说明以下port不要用已经用过的端口就OK。

2，3，4见以下代码：

Java code

package com.test.thread;import javax.management.MBeanAttributeInfo;import javax.management.MBeanInfo;import javax.management.MBeanServerConnection;import javax.management.ObjectName;import javax.management.remote.JMXConnector;import javax.management.remote.JMXConnectorFactory;import javax.management.remote.JMXServiceURL;public class ThreadThreshold { // mbean server connection private static MBeanServerConnection mbsc = null; /** * @param args */ public static void main(String[] args) { try { String jmxURL = "service:jmx:rmi:///jndi/rmi://localhost:8050/jmxrmi";//tomcat jmx url JMXServiceURL serviceURL = new JMXServiceURL(jmxURL); JMXConnector connector = JMXConnectorFactory.connect(serviceURL, null); mbsc = connector.getMBeanServerConnection(); ObjectName threadObjName = new ObjectName( "Catalina:type=ThreadPool,name=http-8080");//这里说明一下，端口最好是动态取得 MBeanInfo mbInfo = mbsc.getMBeanInfo(threadObjName); String attrName = "currentThreadCount";//tomcat的线程数对应的属性值 MBeanAttributeInfo[] mbAttributes = mbInfo.getAttributes(); System.out.println("currentThreadCount:"+mbsc.getAttribute(threadObjName, attrName)); } catch (Exception e) { e.printStackTrace(); } }}

这个代码不许要设置CLASSPATH了，有JDK就行（当然应该是1.5版本的哈）。