mirror of https://github.com/alibaba/arthas.git
You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
161 lines
6.4 KiB
Plaintext
161 lines
6.4 KiB
Plaintext
Advanced Usage
|
|
==============
|
|
|
|
## Basic
|
|
|
|
* help - display Arthas help
|
|
* cls - clear the screen
|
|
* [cat](cat.md) - Concatenate and print files
|
|
* [echo](echo.md) - write arguments to the standard output
|
|
* [grep](grep.md) - Pattern searcher
|
|
* [base64](base64.md) - Encode and decode using Base64 representation.
|
|
* [tee](tee.md) - Copies standard input to standard output, making a copy in zero or more files.
|
|
* [pwd](pwd.md) - Return working directory name
|
|
* session - display current session information
|
|
* [reset](reset.md) - reset all the enhanced classes. All enhanced classes will also be reset when Arthas server is closed by `stop`
|
|
* version - print the version for the Arthas attached to the current Java process
|
|
* history - view command history
|
|
* quit/exit - exit the current Arthas session, without effecting other sessions
|
|
* stop - terminate the Arthas server, all Arthas sessions will be destroyed
|
|
* [keymap](keymap.md) - keymap for Arthas keyboard shortcut
|
|
|
|
## JVM
|
|
|
|
* [dashboard](dashboard.md) - dashboard for the system's real-time data
|
|
* [thread](thread.md) - show java thread information
|
|
* [jvm](jvm.md) - show JVM information
|
|
* [sysprop](sysprop.md) - view/modify system properties
|
|
* [sysenv](sysenv.md) — view system environment variables
|
|
* [vmoption](vmoption.md) - view/modify the vm diagnostic options.
|
|
* [perfcounter](perfcounter.md) - show JVM Perf Counter information
|
|
* [logger](logger.md) - print the logger information, update the logger level
|
|
* [getstatic](getstatic.md) - examine class's static properties
|
|
* [ognl](ognl.md) - execute ognl expression
|
|
* [mbean](mbean.md) - show Mbean information
|
|
* [heapdump](heapdump.md) - dump java heap in hprof binary format, like `jmap`
|
|
|
|
## class/classloader
|
|
|
|
* [sc](sc.md) - check the info for the classes loaded by JVM
|
|
* [sm](sm.md) - check methods info for the loaded classes
|
|
* [jad](jad.md) - decompile the specified loaded classes
|
|
* [mc](mc.md) - Memory compiler, compiles `.java` files into `.class` files in memory
|
|
* [retransform](retransform.md) - load external `*.class` files and retransform it into JVM
|
|
* [redefine](redefine.md) - load external `*.class` files and re-define it into JVM
|
|
* [dump](dump.md) - dump the loaded classes in byte code to the specified location
|
|
* [classloader](classloader.md) - check the inheritance structure, urls, class loading info for the specified class; using classloader to get the url of the resource e.g. `java/lang/String.class`
|
|
|
|
## monitor/watch/trace - related
|
|
|
|
> **Attention**: commands here are taking advantage of byte-code-injection, which means we are injecting some [aspects](https://en.wikipedia.org/wiki/Aspect-oriented_programming) into the current classes for monitoring and statistics purpose. Therefore, when using it for online troubleshooting in your production environment, you'd better **explicitly specify** classes/methods/criteria, and remember to remove the injected code by `stop` or `reset`.
|
|
|
|
* [monitor](monitor.md) - monitor method execution statistics
|
|
* [watch](watch.md) - display the input/output parameter, return object, and thrown exception of specified method invocation
|
|
* [trace](trace.md) - trace the execution time of specified method invocation
|
|
* [stack](stack.md) - display the stack trace for the specified class and method
|
|
* [tt](tt.md) - time tunnel, record the arguments and returned value for the methods and replay
|
|
|
|
## options
|
|
|
|
* [options](options.md) - check/set Arthas global options
|
|
|
|
|
|
## profiler/flame graph
|
|
|
|
* [profiler](profiler.md) - use [async-profiler](https://github.com/jvm-profiling-tools/async-profiler) to generate flame graph
|
|
|
|
## pipe
|
|
|
|
Arthas provides `pipe` to process the result returned from commands further, e.g. `sm java.lang.String * | grep 'index'`. Commands supported in `pipe`:
|
|
|
|
* grep - filter the result with the given keyword
|
|
* plaintext - remove the ANSI color
|
|
* wc - count lines
|
|
|
|
## async jobs
|
|
|
|
[async](async.md) can be handy when a problem is hardly to reproduce in the production environment, e.g. one `watch` condition may happen only once in one single day.
|
|
|
|
* job control - use `>` to redirect result into the log file, use `&` to put the job to the background. Job keeps running even if the session is disconnected (the session lifecycle is 1 day by default)
|
|
* jobs - list all jobs
|
|
* kill - forcibly terminate the job
|
|
* fg - bring the suspend job to the foreground
|
|
* bg - put the job to run in the background
|
|
|
|
## Web Console
|
|
|
|
Arthas supports living inside a browser. The communication between arthas and browser is via websocket.
|
|
|
|
* [Web Console](web-console.md)
|
|
|
|
## Arthas Properties
|
|
|
|
* [Arthas Properties](arthas-properties.md)
|
|
|
|
## Start as a Java Agent
|
|
|
|
* [Start as a Java Agent](agent.md)
|
|
|
|
|
|
## as.sh and arthas-boot tips
|
|
|
|
* Select the process to be attached via the `select` option.
|
|
|
|
Normally, `as.sh`/`arthas-boot.jar` needs to a pid, bacause the pid will change.
|
|
|
|
For example, with `arthas-demo.jar` already started, use the `jps` command to see.
|
|
|
|
```bash
|
|
$ jps
|
|
58883 arthas-demo.jar
|
|
58884 Jps
|
|
```
|
|
|
|
The `select` option allows you to specify a process name, which is very convenient.
|
|
|
|
```bash
|
|
$ ./as.sh --select arthas-demo
|
|
Arthas script version: 3.3.6
|
|
[INFO] JAVA_HOME: /tmp/java/8.0.222-zulu
|
|
Arthas home: /Users/admin/.arthas/lib/3.3.6/arthas
|
|
Calculating attach execution time...
|
|
Attaching to 59161 using version /Users/admin/.arthas/lib/3.3.6/arthas...
|
|
|
|
real 0m0.572s
|
|
user 0m0.281s
|
|
sys 0m0.039s
|
|
Attach success.
|
|
telnet connecting to arthas server... current timestamp is 1594280799
|
|
Trying 127.0.0.1...
|
|
Connected to localhost.
|
|
Escape character is '^]'.
|
|
,---. ,------. ,--------.,--. ,--. ,---. ,---.
|
|
/ O \ | .--. ''--. .--'| '--' | / O \ ' .-'
|
|
| .-. || '--'.' | | | .--. || .-. |`. `-.
|
|
| | | || |\ \ | | | | | || | | |.-' |
|
|
`--' `--'`--' '--' `--' `--' `--'`--' `--'`-----'
|
|
|
|
|
|
wiki https://arthas.aliyun.com/doc
|
|
tutorials https://arthas.aliyun.com/doc/arthas-tutorials.html
|
|
version 3.3.6
|
|
pid 58883
|
|
```
|
|
|
|
## User data report
|
|
|
|
After the `3.1.4` version, arthas support user data report.
|
|
|
|
At startup, use the `stat-url` option, such as: `./as.sh --stat-url 'http://192.168.10.11:8080/api/stat'`
|
|
|
|
There is a sample data report in the tunnel server that users can implement on their own.
|
|
|
|
[StatController.java](https://github.com/alibaba/arthas/blob/master/tunnel-server/src/main/java/com/alibaba/arthas/tunnel/server/app/web/StatController.java)
|
|
|
|
## Other features
|
|
|
|
* [Async support](async.md)
|
|
* [log the output](save-log.md)
|
|
* [batch](batch-support.md)
|
|
* [how to use ognl](https://github.com/alibaba/arthas/issues/11)
|