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阿里神器Arthas 3.1.2版本发布，新特性解读

發布時間：2025/3/16 编程问答 35 豆豆

生活随笔收集整理的這篇文章主要介紹了阿里神器Arthas 3.1.2版本发布，新特性解读小編覺得挺不錯的,現在分享給大家,幫大家做個參考.

Arthas是Alibaba開源的Java診斷工具，深受開發者喜愛。

Github：https://github.com/alibaba/arthas
文檔：https://alibaba.github.io/arthas

Arthas 3.1.2版本持續增加新特性，下面重點介紹：

logger/heapdump/vmoption/stop命令
通過tunnel server連接不同網絡的arthas，方便統一管控
易用性持續提升：提示符修改為arthas@pid形式，支持ctrl + k清屏快捷鍵

logger/heapdump/vmoption/stop命令

logger命令

查看logger信息，更新logger level

https://alibaba.github.io/arthas/logger.html

查看所有logger信息

以下面的logback.xml為例：

<?xml?version="1.0"?encoding="UTF-8"?> <configuration><appender?name="APPLICATION"?class="ch.qos.logback.core.rolling.RollingFileAppender"><file>app.log</file><rollingPolicy?class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy"><fileNamePattern>mylog-%d{yyyy-MM-dd}.%i.txt</fileNamePattern><maxFileSize>100MB</maxFileSize><maxHistory>60</maxHistory><totalSizeCap>2GB</totalSizeCap></rollingPolicy><encoder><pattern>%logger{35}?-?%msg%n</pattern></encoder></appender><appender?name="ASYNC"?class="ch.qos.logback.classic.AsyncAppender"><appender-ref?ref="APPLICATION"?/></appender><appender?name="CONSOLE"?class="ch.qos.logback.core.ConsoleAppender"><encoder><pattern>%-4relative?[%thread]?%-5level?%logger{35}?-?%msg?%n</pattern><charset>utf8</charset></encoder></appender><root?level="INFO"><appender-ref?ref="CONSOLE"?/><appender-ref?ref="ASYNC"?/></root> </configuration>

使用logger命令打印的結果是：

[arthas@2062]$?loggername???????????????????????????????????ROOTclass??????????????????????????????????ch.qos.logback.classic.LoggerclassLoader????????????????????????????sun.misc.Launcher$AppClassLoader@2a139a55classLoaderHash????????????????????????2a139a55level??????????????????????????????????INFOeffectiveLevel?????????????????????????INFOadditivity?????????????????????????????truecodeSource?????????????????????????????file:/Users/hengyunabc/.m2/repository/ch/qos/logback/logback-classic/1.2.3/logback-classic-1.2.3.jarappenders??????????????????????????????name????????????CONSOLEclass???????????ch.qos.logback.core.ConsoleAppenderclassLoader?????sun.misc.Launcher$AppClassLoader@2a139a55classLoaderHash?2a139a55target??????????System.outname????????????APPLICATIONclass???????????ch.qos.logback.core.rolling.RollingFileAppenderclassLoader?????sun.misc.Launcher$AppClassLoader@2a139a55classLoaderHash?2a139a55file????????????app.logname????????????ASYNCclass???????????ch.qos.logback.classic.AsyncAppenderclassLoader?????sun.misc.Launcher$AppClassLoader@2a139a55classLoaderHash?2a139a55appenderRef?????[APPLICATION]

從appenders的信息里，可以看到

CONSOLE logger的target是System.out
APPLICATION logger是RollingFileAppender，它的file是app.log
ASYNC它的appenderRef是APPLICATION，即異步輸出到文件里

查看指定名字的logger信息

[arthas@2062]$?logger?-n?org.springframework.webname???????????????????????????????????org.springframework.webclass??????????????????????????????????ch.qos.logback.classic.LoggerclassLoader????????????????????????????sun.misc.Launcher$AppClassLoader@2a139a55classLoaderHash????????????????????????2a139a55level??????????????????????????????????nulleffectiveLevel?????????????????????????INFOadditivity?????????????????????????????truecodeSource?????????????????????????????file:/Users/hengyunabc/.m2/repository/ch/qos/logback/logback-classic/1.2.3/logback-classic-1.2.3.jar

更新logger level

[arthas@2062]$?logger?--name?ROOT?--level?debug update?logger?level?success.

heapdump命令

dump java heap, 類似jmap命令的heap dump功能。

https://alibaba.github.io/arthas/heapdump.html

dump到指定文件

[arthas@58205]$?heapdump?/tmp/dump.hprof Dumping?heap?to?/tmp/dump.hprof... Heap?dump?file?created

只dump live對象

[arthas@58205]$?heapdump?--live?/tmp/dump.hprof Dumping?heap?to?/tmp/dump.hprof... Heap?dump?file?created

vmoption命令

查看，更新VM診斷相關的參數

https://alibaba.github.io/arthas/vmoption.html

查看所有的option

[arthas@56963]$?vmoptionKEY????????????????????VALUE???????????????????ORIGIN?????????????????WRITEABLE ---------------------------------------------------------------------------------------------HeapDumpBeforeFullGC???false???????????????????DEFAULT????????????????trueHeapDumpAfterFullGC????false???????????????????DEFAULT????????????????trueHeapDumpOnOutOfMemory??false???????????????????DEFAULT????????????????trueErrorHeapDumpPath???????????????????????????????????DEFAULT????????????????trueCMSAbortablePrecleanW??100?????????????????????DEFAULT????????????????trueaitMillisCMSWaitDuration????????2000????????????????????DEFAULT????????????????trueCMSTriggerInterval?????-1??????????????????????DEFAULT????????????????truePrintGC????????????????false???????????????????DEFAULT????????????????truePrintGCDetails?????????true????????????????????MANAGEMENT?????????????truePrintGCDateStamps??????false???????????????????DEFAULT????????????????truePrintGCTimeStamps??????false???????????????????DEFAULT????????????????truePrintGCID??????????????false???????????????????DEFAULT????????????????truePrintClassHistogramBe??false???????????????????DEFAULT????????????????trueforeFullGCPrintClassHistogramAf??false???????????????????DEFAULT????????????????trueterFullGCPrintClassHistogram????false???????????????????DEFAULT????????????????trueMinHeapFreeRatio???????0???????????????????????DEFAULT????????????????trueMaxHeapFreeRatio???????100?????????????????????DEFAULT????????????????truePrintConcurrentLocks???false???????????????????DEFAULT????????????????true

查看指定的option

[arthas@56963]$?vmoption?PrintGCDetailsKEY????????????????????VALUE???????????????????ORIGIN?????????????????WRITEABLE ---------------------------------------------------------------------------------------------PrintGCDetails?????????false???????????????????MANAGEMENT?????????????true

更新指定的option

[arthas@56963]$?vmoption?PrintGCDetails?true Successfully?updated?the?vm?option. PrintGCDetails=true

stop命令

之前有用戶吐槽，不小心退出Arthas console之后，shutdown會關閉系統，因此增加了stop命令來退出arthas，功能和shutdown命令一致。

通過tunnel server連接不同網絡的arthas

https://alibaba.github.io/arthas/web-console.html

在新版本里，增加了arthas tunnel server的功能，用戶可以通過tunnel server很方便連接不同網絡里的arthas agent，適合做統一管控。

啟動arthas時連接到tunnel server

在啟動arthas，可以傳遞--tunnel-server參數，比如：

as.sh?--tunnel-server?'ws://47.75.156.201:7777/ws'

目前47.75.156.201是一個測試服務器，用戶可以自己搭建arthas tunnel server

如果有特殊需求，可以通過--agent-id參數里指定agentId。默認情況下，會生成隨機ID。

attach成功之后，會打印出agentId，比如：

??,---.??,------.?,--------.,--.??,--.??,---.???,---./??O??\?|??.--.?''--.??.--'|??'--'??|?/??O??\?'???.-' |??.-.??||??'--'.'???|??|???|??.--.??||??.-.??|`.??`-. |??|?|??||??|\??\????|??|???|??|??|??||??|?|??|.-'????| `--'?`--'`--'?'--'???`--'???`--'??`--'`--'?`--'`-----'wiki??????https://alibaba.github.io/arthas tutorials?https://alibaba.github.io/arthas/arthas-tutorials version???3.1.2 pid???????86183 time??????2019-08-30?15:40:53 id????????URJZ5L48RPBR2ALI5K4V

如果是啟動時沒有連接到 tunnel server，也可以在后續自動重連成功之后，通過 session命令來獲取 agentId：

[arthas@86183]$?sessionName???????????Value -----------------------------------------------------JAVA_PID???????86183SESSION_ID?????f7273eb5-e7b0-4a00-bc5b-3fe55d741882AGENT_ID???????URJZ5L48RPBR2ALI5K4VTUNNEL_SERVER??ws://47.75.156.201:7777/ws

以上面的為例，在瀏覽器里訪問 http://47.75.156.201:8080/ ，輸入 agentId，就可以連接到本機上的arthas了。

Arthas tunnel server的工作原理

browser?<->?arthas?tunnel?server?<->?arthas?tunnel?client?<->?arthas?agent

https://github.com/alibaba/arthas/blob/master/tunnel-server/README.md

易用性持續提升

提示符修改為arthas@pid形式，用戶可以確定當前進程ID，避免多個進程時誤操作
[arthas@86183]$?help
增加ctrl + k清屏快捷鍵

總結

總之，3.1.2版本的Arthas新增加了logger/heapdump/vmoption/stop命令，增加了tunnel server，方便統一管控。另外還有一些bug修復等，可以參考

Release Note:?https://github.com/alibaba/arthas/releases/tag/3.1.2

最后，Arthas的在線教程考慮重新組織，歡迎大家參與，提出建議：

https://github.com/alibaba/arthas/issues/847

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