从本地触发远程服务器上的快照

Question

我正试图从我的测试代码中远程分析运行在运行1.8 JVM和Apache Tomcat 7.xx的64位linux服务器上的alfresco，但是我不知道如何以编程方式触发快照。

我想要做的是连接到远程服务器，开始性能分析，并将测试代码中用Java编写的服务器性能快照保存到我的本地机器上。

我已经在JProfiler服务器上安装了Linux9.2，可以通过JProfiler图形用户界面连接和拍摄快照。出于安全性考虑，服务器还需要SSH连接。我想在我的代码中做到这一点，类似于Controller.saveSnapshot(文件)对本地JVM的工作方式。

这个是可能的吗？

我知道我可以设置触发器并让远程分析器在服务器上保存快照，但这不是我想要的。

此外，我尝试使用命令行控制器，但即使在远程VM选项中使用正确的参数，也无法使其连接到服务器。

我还尝试使用ConnectionFactor.createRemoteConnection()，但是没有看到允许输入密码的参数，所以失败了。

Answer 1

您可以通过编程方式访问JProfiler MBean。下面是一个如何做到这一点的例子。我会在远程机器上运行这样一个程序，并通过SSH启动它，因为JMX连接很难通过SSH进行隧道传输。

import javax.management.MBeanServerConnection;
import javax.management.ObjectName;
import javax.management.remote.JMXConnector;
import javax.management.remote.JMXConnectorFactory;
import javax.management.remote.JMXServiceURL;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;

// Shows how to connect to the the JProfiler MBean programatically
// The profiled process has to be in offline profiling mode and the JMX server
// has to be started by passing -Djprofiler.jmxServerPort=[port] to the profiled JVM.
// This will not work in nowait mode because the MBean is not registered in that case.
public class MBeanProgrammaticAccessExample {

    public static void main(String[] args) throws Exception {
        if (args.length == 0) {
            System.out.println("Specify the port as an argument that was passed to " +
                    "the profiled JVM with the VM parameter " +
                    "-Djprofiler.jmxServerPort=[port]");
        }
        String port = args[0];
        // In this case the connection is made to a process on localhost, but it could
        // be on a remote system as well. Note that the connection is made via JMX which
        // does not work well with firewalls
        System.out.println("Connecting to localhost:" + port);
        JMXServiceURL jmxUrl = new JMXServiceURL(
                "service:jmx:rmi:///jndi/rmi://localhost:" + port + "/jmxrmi");
        JMXConnector connector = JMXConnectorFactory.newJMXConnector(jmxUrl, 
                Collections.<String, Object>emptyMap());

        Map<String, Object> env = new HashMap<>();

        // If you have protected the JMX server with a JMX password file by passing 
        // -Djprofiler.jmxPasswordFile=[file] to the profiled JVM, you can specify 
        // the password like this:
        //env.put(JMXConnector.CREDENTIALS, new String[] {"username", "password"});

        connector.connect(env);
        MBeanServerConnection connection = connector.getMBeanServerConnection();
        ObjectName objectName = new ObjectName(
                "com.jprofiler.api.agent.mbean:type=RemoteController");
        if (!connection.isRegistered(objectName)) {
            throw new RuntimeException("JProfiler MBean not found.");
        }

        RemoteControllerMBean mbeanProxy = JMX.newMBeanProxy(connection, 
                objectName, RemoteControllerMBean.class, true);

        // You can look up all available operations in the javadoc of 
        // com.jprofiler.api.agent.mbean.RemoteControllerMBean
        System.out.println("Recording CPU data for 5 seconds ....");
        mbeanProxy.startCPURecording(true);
        // If you do not want a dependency on the JProfiler classes 
        // you can make the above call like this:
        //connection.invoke(objectName, "startCPURecording", new Object[] {true},
        // new String[] {Boolean.TYPE.getName()});

        Thread.sleep(5000);
        System.out.println("Saving snapshot to the working directory " +
                "of the profiled JVM ....");
        mbeanProxy.saveSnapshot("snapshot.jps");

        connector.close();
        System.out.println("Success");

    }
}