JMX实现远程服务器系统监控之一

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JMX实现远程服务器系统监控之一

2024-07-31 21:07:00 212人阅读

最近做多个远程服务器的系统监控，花费了不少的时间，下面就做一个总结

从JAVA 5开始，JDK提供了一些JVM检测的API，这就是有名的java.lang.management 包，包里提供了许多MXBean的接口类，可以很方便的获取到JVM的内存、GC、线程、锁、class、甚至操作系统层面的各种信息,本文就简单的介绍一种利用JMX对JAVA进程进行CPU、堆内存使用的监控。可能有人会觉得没必要这样做，因为用jconsole之类的工具都能做到，而且会比本文的例子更详细。但是有些时候将console不一定能监控到作为系统服务的java进程，我最近就不得不自己编码去获取远程java进程的监控数据。希望能起到抛砖引玉的作用吧。

第一步：向被监控的服务器Tomcat中添加一段配置代码

详情：http://tomcat.apache.org/tomcat-6.0-doc/monitoring.html#Enabling_JMX_Remote

打开Tomcat的bin文件夹下的catalina.bat文件（用文件编辑软件打开）

添加如下代码：

set CATALINA_OPTS=-Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.port=8787 -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.authenticate=false

2 启动tomcat服务，调用jconsole监视器查看里面的MBean

在CMD中输入： jconsole

在远程哪儿输入：

service:jmx:rmi:///jndi/rmi://192.168.85.54:8787/jmxrmi （替换服务器tomcat所在的ip）

可以显示如下图：包括CPU占用率，堆信息，非堆信息，类加载，内存使用情况等，如下图

点开右边的MBean，我们可以获取其对应MBean的ObjectName，然后通过属性和做操的Key值获取想要的数据，如下图

3 实现代码如下：

package pyc.jvm.monitor;

import java.io.IOException;

import java.util.Timer;
import java.util.TimerTask;
import java.util.concurrent.TimeUnit;

import javax.management.MBeanServerConnection;
import javax.management.MalformedObjectNameException;
import javax.management.ObjectName;
import javax.management.openmbean.CompositeDataSupport;
import javax.management.remote.JMXConnector;
import javax.management.remote.JMXConnectorFactory;
import javax.management.remote.JMXServiceURL;

/**
 * 创建时间：2014-11-5 上午11:37:22
 * 
 * @author zhangtianyou
 * @version 2.2
 */

public class JMXTest {
	
	//具体格式查看相关的API
	private final static String SERVICE_1 = "service:jmx:rmi:///jndi/rmi://192.168.85.54:8787/jmxrmi";

	public static void main(String[] args) throws IOException,
			MalformedObjectNameException, NullPointerException {

		Timer timer = new Timer();
		timer.schedule(new JMXTest().new MonitorTask(SERVICE_1), 0, 10000);

	}
	
	
	private class MonitorTask extends TimerTask{
		private String service ;
		
		public MonitorTask(String service){
			this.service = service;
		}
		
		@Override
		public void run() {
			JMXmonitor(service);
			
		}
		
	}

	private static void JMXmonitor(String service) {
		

		JMXConnector connector = null;

		try {
			JMXServiceURL url = new JMXServiceURL(SERVICE_1);
			System.out.println("url: " + SERVICE_1);
			
			connector = JMXConnectorFactory.connect(url);
			MBeanServerConnection connection = connector.getMBeanServerConnection();
			
			System.out.println("Catalina:"); 
			
			ObjectName objectName = new ObjectName("Catalina:type=Engine");
			System.out.println("defaultHost:"
					+ (String) connection.getAttribute(objectName,
							"defaultHost"));
			System.out.println("name:" + (String) connection.getAttribute(objectName, "name"));
			System.out.println("baseDir:" + (String) connection.getAttribute(objectName,"baseDir"));
			connection.getAttribute(objectName, "valveObjectNames");

			objectName = new ObjectName("Catalina:type=Host,host=localhost");
			javax.management.ObjectName[] a = (javax.management.ObjectName[]) connection
					.getAttribute(objectName, "children");

			for (int i = 0; i < a.length; i++) {
				System.out.println(a[i].toString());
			}
			System.out.println("\nMemory");
			System.out.println("memory: HeapMemoryUsage");
			objectName = new ObjectName("java.lang:type=Memory");
			CompositeDataSupport heapMemoryUsage = (CompositeDataSupport) connection.getAttribute(objectName, "HeapMemoryUsage");
            System.out.println("committed = " + convertKB(heapMemoryUsage.get("committed")));
            System.out.println("init = " + convertKB(heapMemoryUsage.get("init")));
            System.out.println("max = " + convertKB(heapMemoryUsage.get("max")));
            System.out.println("used = " + convertKB(heapMemoryUsage.get("used")));
            
            System.out.println("\nmemory: NonHeapMemoryUsage");
			CompositeDataSupport nonHeapMemoryUsage = (CompositeDataSupport) connection.getAttribute(objectName, "NonHeapMemoryUsage");
            System.out.println("committed = " + convertKB(nonHeapMemoryUsage.get("committed")));
            System.out.println("init = " + convertKB(nonHeapMemoryUsage.get("init")));
            System.out.println("max = " + convertKB(nonHeapMemoryUsage.get("max")));
            System.out.println("used = " + convertKB(nonHeapMemoryUsage.get("used")));
            
            System.out.println("\nThread");
            objectName = new ObjectName("java.lang:type=Threading");
            //线程总数
            System.out.println("ThreadCount = " + connection.getAttribute(objectName, "ThreadCount"));
            //守护线程
            System.out.println("DaemonThreadCount = " + connection.getAttribute(objectName, "DaemonThreadCount"));
            //返回自从Java虚拟机启动或峰值重置以来峰值活动线程计数
            System.out.println("PeakThreadCount = " + connection.getAttribute(objectName, "PeakThreadCount"));
            System.out.println("CurrentThreadCpuTime = " + connection.getAttribute(objectName, "CurrentThreadCpuTime") + "ms");
            System.out.println("CurrentThreadUserTime = " + connection.getAttribute(objectName, "CurrentThreadUserTime") + "ms");
            
            System.out.println("\nClassLoading");
            objectName = new ObjectName("java.lang:type=ClassLoading");
            System.out.println("TotalLoadedClassCount = " +  connection.getAttribute(objectName, "TotalLoadedClassCount") + "个");
            
            System.out.println("\nCpu");
            objectName = new ObjectName("java.lang:type=OperatingSystem");
            long start = System.currentTimeMillis();
            long startC = (long) connection.getAttribute(objectName, "ProcessCpuTime");
            
            try {
				TimeUnit.SECONDS.sleep(5);
			} catch (Exception e) {
				System.out.println("中断异常"); 
			}
            
            long end = System.currentTimeMillis();
            long endC = (long) connection.getAttribute(objectName, "ProcessCpuTime");
            //end - start 即为当前采集的时间单元，单位ms  
            //endT - startT 为当前时间单元内cpu使用的时间，单位为ns  
            //所以：
            int availableProcessors = (int)connection.getAttribute(objectName, "AvailableProcessors");
            double ratio = (endC-startC) / 1000000.0 / (end-start) / availableProcessors;  
            
            System.out.println("cup使用率 = " + ratio * 100 + "%");
		} catch (Exception ex) {
			System.out.println(ex);
		} finally {

			try {
				connector.close();
			} catch (Exception ex) {
				System.out.println(ex);
			}
		}
	}
	
	private static String convertKB(Object obj){
		
		long src = http://www.mamicode.com/(long)obj;>
4 运行效果如下：
url: service:jmx:rmi:///jndi/rmi://192.168.85.54:8787/jmxrmi
Catalina:
defaultHost:localhost
name:Catalina
baseDir:E:\jmxserver\apache-tomcat1
Catalina:j2eeType=WebModule,name=//localhost/ServletDemo,J2EEApplication=none,J2EEServer=none
Catalina:j2eeType=WebModule,name=//localhost/,J2EEApplication=none,J2EEServer=none
Catalina:j2eeType=WebModule,name=//localhost/manager,J2EEApplication=none,J2EEServer=none
Catalina:j2eeType=WebModule,name=//localhost/docs,J2EEApplication=none,J2EEServer=none
Catalina:j2eeType=WebModule,name=//localhost/examples,J2EEApplication=none,J2EEServer=none
Catalina:j2eeType=WebModule,name=//localhost/host-manager,J2EEApplication=none,J2EEServer=none

Memory
memory: HeapMemoryUsage
committed = 59392.0KB
init = 63667.75KB
max = 906752.0KB
used = 7679.4609375KB

memory: NonHeapMemoryUsage
committed = 31680.0KB
init = 24000.0KB
max = 133120.0KB
used = 17649.6484375KB

Thread
ThreadCount = 53
DaemonThreadCount = 52
PeakThreadCount = 56
CurrentThreadCpuTime = 15600100ms
CurrentThreadUserTime = 15600100ms

ClassLoading
TotalLoadedClassCount = 2581个

Cpu
cup使用率 = 0.07795372776334199%

获取值和jconsole基本一致，这种直接ObjectName获取比较生硬，JDK版本不一样，有可能Key值不一致，所以需要自动获取。
见下文。
JMX实现远程服务器系统监控之一

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JMX实现远程服务器系统监控之一

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