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cjmx

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资源说明：Command line JMX library

cjmx
====

cjmx is a command line JMX client intended to be used when graphical tools (e.g., JConsole, VisualVM) are unavailable.  Additionally, cjmx intends to be useful in scripting environments.

Getting cjmx
============

cjmx is available on Maven Central using groupId `com.github.cjmx` and artifactId `cjmx_2.12`.  An executable JAR is published using the `app` classifier.

 - cjmx artifacts on Maven Central: https://search.maven.org/search?q=g:com.github.cjmx
 - Executable JAR using Scala 2.12: https://search.maven.org/remotecontent?filepath=com/github/cjmx/cjmx_2.12/2.8.1/cjmx_2.12-2.8.1-app.jar

Note: Both a regular and an application JAR (with embedded dependencies and minimized) are published on Maven Central.

Building
========
To build, run `./sbt publish-local`.  This will build `target/scala-2.12/proguard/cjmx_2.12-2.8.1-SNAPSHOT.jar` and install a copy to your local ivy cache.

Usage
=====

Launching cjmx is done via, using Java 8+:

    java -cp $JAVA_HOME/lib/tools.jar:target/scala-2.12/proguard/cjmx_2.12-2.8.1-SNAPSHOT.jar cjmx.Main [PID]

If a PID is specified on the command line, cjmx will attempt to connect to the local JVM with that PID; otherwise, cjmx starts in a disconnected state.

Once cjmx starts, a prompt will appear.  cjmx makes heavy use of tab completion, enabling exploration of the MBean tree.  For example:

    java -jar path/to/cjmx.jar 1234
    > 
    disconnect   exit         describe      names        select
    > names 'java.
    java.lang:           java.util.logging:
    > describe -d 'java.lang:type=
    *                              ClassLoading       Compilation
    GarbageCollector   Memory             MemoryManager      MemoryPool
    OperatingSystem    Runtime            Threading
    > names 'java.lang:type=*'
    java.lang:type=ClassLoading
    java.lang:type=Compilation
    java.lang:type=Memory
    java.lang:type=OperatingSystem
    java.lang:type=Runtime
    java.lang:type=Threading
    > describe -d 'java.lang:type=Memory'
    Object name: java.lang:type=Memory
    ----------------------------------
    Description: Information on the management interface of the MBean

    Attributes:
      Verbose: boolean
        Description: Verbose
      ObjectPendingFinalizationCount: int
        Description: ObjectPendingFinalizationCount
      HeapMemoryUsage: CompositeData
        Description: HeapMemoryUsage
      NonHeapMemoryUsage: CompositeData
        Description: NonHeapMemoryUsage

    Operations:
      gc(): void
        Description: gc

    Notifications:
      javax.management.Notification
        Description: MEMORY NOTIFICATION
        Notification types:
          java.management.memory.threshold.exceeded
          java.management.memory.collection.threshold.exceeded

    > mbeans 'java.lang:type=Memory' select *
    java.lang:type=Memory
    ---------------------
      Verbose: false
      ObjectPendingFinalizationCount: 0
      HeapMemoryUsage:
        committed: 110432256
        init: 0
        max: 2130051072
        used: 63307880
      NonHeapMemoryUsage:
        committed: 140849152
        init: 24317952
        max: 318767104
        used: 121815008

Alternatively, cjmx can run a series of commands and then terminate.  This is done by specifying each command as a program argument.  For example:

    java -jar path/to/cjmx.jar 1234 "describe 'java.lang:type=Memory'" "mbeans 'java.lang:type=Memory' select *"
    Object name: java.lang:type=Memory
    ----------------------------------
    Description: Information on the management interface of the MBean

    Attributes:
      Verbose: boolean
      ObjectPendingFinalizationCount: int
      HeapMemoryUsage: CompositeData
      NonHeapMemoryUsage: CompositeData

    Operations:
      gc(): void

    Notifications:
      javax.management.Notification

    java.lang:type=Memory
    ---------------------
      Verbose: false
      ObjectPendingFinalizationCount: 0
      HeapMemoryUsage:
        committed: 110432256
        init: 0
        max: 2130051072
        used: 76943832
      NonHeapMemoryUsage:
        committed: 140980224
        init: 24317952
        max: 318767104
        used: 122049448

All commands have help information available by typing "help" in the console.

Remote Connections
==================

cjmx supports connecting to remote JMX agents.  A simple _*insecure*_ way of running the remote process is:

    java -Dcom.sun.management.jmxremote.port=7091 -Dcom.sun.management.jmxremote.authenticate=false -Dcom.sun.management.jmxremote.ssl=false MainClass

With this process running on host 'server', you can connect via cjmx using the 'remote-connect' command:

    cjmx remote-connect server:7091

Once connected, cjmx supports all the same behaviors as with a local connection.

For a more secure connection, it is recommended you run with SSL and/or with username authentication.  Usernames can be specified as the optional second parameter of the 'remote-connect' command:

    cjmx remote-connect server:7091 admin

cjmx will then prompt for the password.  To use SSL, you must run cjmx with the appropriate `javax.net.ssl` flags.

For more details on configuring JMX agents, see: https://docs.oracle.com/javase/8/docs/technotes/guides/management/agent.html

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