arthas 安装部署

什么是Arthas(阿尔萨斯)?

Arthas是Alibaba开源的Java诊断工具。支持Linux/Mac/Windows，采用命令行交互模式，同时提供丰富的 Tab 自动补全功能，进一步方便进行问题的定位和诊断。

Arthas的用途？

当你遇到以下类似问题而束手无策时，Arthas可以帮助你解决：

1. 这个类从哪个 jar 包加载的？为什么会报各种类相关的 Exception？

2. 我改的代码为什么没有执行到？难道是我没 commit？分支搞错了？

3. 遇到问题无法在线上 debug，难道只能通过加日志再重新发布吗？

4. 线上遇到某个用户的数据处理有问题，但线上同样无法 debug，线下无法重现！

5. 是否有一个全局视角来查看系统的运行状况？

6. 有什么办法可以监控到JVM的实时运行状态？

7. 怎么快速定位应用的热点，生成火焰图？

Arthas的部署

•     在线部署

curl -O https://arthas.aliyun.com/arthas-boot.jar  #下载arthas启动包
java -jar arthas-boot.jar  运行arthas

•     离线部署

1. 下载jar包；https://arthas.aliyun.com/arthas-boot.jar
2. 在有网的windows环境下或linux环境下，在线部署arthas-boot.jar,并运行，找到  C:\Users\Administrator\.arthas\lib\3.4.8\arthas目录下的文件，备用。

   C:\Users\Administrator\Downloads>java -jar arthas-boot.jar
   [INFO] arthas-boot version: 3.4.8
   [INFO] Process 6092 already using port 3658
   [INFO] Process 6092 already using port 8563
   [INFO] Found existing java process, please choose one and input the serial number of the process, eg : 1. Then hit ENTER.
   * [1]: 6092 org.jetbrains.jps.cmdline.Launcher
     [2]: 12112
     [3]: 7164
   1
   [INFO] Start download arthas from remote server: https://arthas.aliyun.com/download/3.4.8?mirror=aliyun
   [INFO] File size: 12.21 MB, downloaded size: 8.00 MB, downloading ...
   [INFO] Download arthas success.
   [INFO] arthas home: C:\Users\Administrator\.arthas\lib\3.4.8\arthas
   [INFO] The target process already listen port 3658, skip attach.
   [INFO] arthas-client connect 127.0.0.1 3658
   
   C:\Users\Administrator\Downloads>
   
   

3. 在离线环境下部署arthas-boot.jar,第一次运行提示异常错误；找到目录/home/hadoop/.arthas/lib/arthas/arthas (如果找不到子目录就创建目录),并把window下载的C:\Users\Administrator\.arthas\lib\3.4.8\arthas目录文件复制到该目录下。

   [hadoop@sx-hadoop-01 home]$ java -jar arthas-boot.jar 
   [INFO] arthas-boot version: 3.4.8
   [INFO] Found existing java process, please choose one and input the serial number of the process, eg : 1. Then hit ENTER.
   * [1]: 32052 org.apache.catalina.startup.Bootstrap
     [2]: 18085 org.apache.hadoop.hdfs.server.namenode.NameNode
     [3]: 18407 org.apache.hadoop.hdfs.tools.DFSZKFailoverController
     [4]: 28845 org.apache.hadoop.mapreduce.v2.hs.JobHistoryServer
     [5]: 27967 org.apache.hadoop.yarn.server.resourcemanager.ResourceManager
   1
   [ERROR] Can not read arthas version from: https://arthas.aliyun.com/api/latest_version
   [ERROR] Can not find Arthas under local: /home/hadoop/.arthas/lib/arthas/arthas and remote repo mirror: aliyun
   [ERROR] Unable to download arthas from remote server, please download the full package according to wiki: https://github.com/alibaba/arthas

4. 重新运行arthas-boot.jar

   [hadoop@sx-hadoop-01 home]$ java -jar arthas-boot.jar 
   [INFO] arthas-boot version: 3.4.8
   [INFO] Found existing java process, please choose one and input the serial number of the process, eg : 1. Then hit ENTER.
   * [1]: 32052 org.apache.catalina.startup.Bootstrap
     [2]: 18085 org.apache.hadoop.hdfs.server.namenode.NameNode
     [3]: 18407 org.apache.hadoop.hdfs.tools.DFSZKFailoverController
     [4]: 28845 org.apache.hadoop.mapreduce.v2.hs.JobHistoryServer
     [5]: 27967 org.apache.hadoop.yarn.server.resourcemanager.ResourceManager
   1
   [ERROR] Can not read arthas version from: https://arthas.aliyun.com/api/latest_version
   [INFO] arthas home: /home/hadoop/.arthas/lib/arthas/arthas
   [INFO] Try to attach process 32052
   [INFO] Attach process 32052 success.
   [INFO] arthas-client connect 127.0.0.1 3658
     ,---.  ,------. ,--------.,--.  ,--.  ,---.   ,---.                           
    /  O  \ |  .--. ''--.  .--'|  '--'  | /  O  \ '   .-'                          
   |  .-.  ||  '--'.'   |  |   |  .--.  ||  .-.  |`.  `-.                          
   |  | |  ||  |\  \    |  |   |  |  |  ||  | |  |.-'    |                         
   `--' `--'`--' '--'   `--'   `--'  `--'`--' `--'`-----'                          
                                                                                   
   
   wiki      https://arthas.aliyun.com/doc                                         
   tutorials https://arthas.aliyun.com/doc/arthas-tutorials.html                   
   version   3.4.8                                                                 
   pid       32052                                                                 
   time      2021-03-08 12:05:06                                                   
   
   [arthas@32052]$