JMX监控Tomcat

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。

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();
}
}

(责任编辑：IT)

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