转载自:https://www.cnblogs.com/linhui0705/p/9795417.html
上个月,阿里开源了一个名为Arthas的监控工具。恰逢近期自己在写多线程处理业务,由此想到了一个问题。
如果在本机开发调试,IDE可以看到当前的活动线程,例如IntelliJ IDEA,线程是运行还是休眠,在Debugger→Threads可以看到。倘若代码写完提交,到测试环境上构建,要怎样才能看到测试服务器上的线程运行情况呢?
前面客套完了,教程GitHub上面也有,这里主要讲下个人在部署的过程和踩到的坑。仅供参考。
GitHub: https://github.com/alibaba/arthas
Docs: https://alibaba.github.io/arthas/index.html
笔者用的是CentOS7裸机。看过教程,按照步骤执行命令:
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curl -L https://alibaba.github.io/arthas/install.sh | sh |
下载了个名称为as.sh的脚本,执行脚本,发现:
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[root@bogon arthas]# ./as.sh Arthas script version: 3.0.4illegal ENV, please set $JAVA_HOME to JDK6+ |
既然是Java监控,没有Java运行环境是不可能跑得起来的(这不是废话吗)。马上安装JDK配置环境变量……这里笔者装的是JDK8u181
JDK: https://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html
解压到/usr/java,执行vi /etc/profile配置环境变量
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export JAVA_HOME=/usr/java/jdk1.8.0_181export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JAVA_HOME/jre/lib/rt.jarexport PATH=$PATH:$JAVA_HOME/bin |
:wq保存退出,再执行命令使配置的变量生效
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source /etc/profile |
回到刚才的目录,启动arthas
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[root@bogon ~]# cd /usr/local/arthas/[root@bogon arthas]# ./as.sh Arthas script version: 3.0.4Error: no available java process to attach.Usage: ./as.sh [-b [-f SCRIPT_FILE]] [debug] [--use-version VERSION] [--attach-only] <PID>[@IP:TELNET_PORT:HTTP_PORT] [debug] : start the agent in debug mode <PID> : the target Java Process ID [IP] : the target's IP [TELNET_PORT] : the target's PORT for telnet [HTTP_PORT] : the target's PORT for http [-b] : batch mode, which will disable interactive process selection. [-f] : specify the path to batch script file. [--attach-only] : only attach the arthas agent to target jvm. [--use-version] : use the specified arthas version to attach.Example: ./as.sh <PID> ./as.sh <PID>@[IP] ./as.sh <PID>@[IP:PORT] ./as.sh debug <PID> ./as.sh -b <PID> ./as.sh -b -f /path/to/script ./as.sh --attach-only <PID> ./as.sh --use-version 2.0.20161221142407 <PID>Here is the list of possible java process(es) to attatch: |
结果发现,无可用Java进程。那就启动一个咯(挖鼻屎),继续……
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[root@bogon arthas]# ./as.sh Arthas script version: 3.0.4Found existing java process, please choose one and hit RETURN.* [1]: 1244 test.jarupdating version 3.0.4 ...######################################################################## 100.0%./as.sh: line 182: unzip: command not foundmv: cannot stat ‘/tmp/temp_3.0.4_1265’: No such file or directoryupdate fail, ignore this update.Calculating attach execution time...Attaching to 1244 using version 3.0.4...Error: Unable to access jarfile /root/.arthas/lib/3.0.4/arthas/arthas-core.jarattach to target jvm (1244) failed, check /root/logs/arthas/arthas.log or stderr of target jvm for any exceptions. |
然而,程序没有如期运行成功。
……
通过度娘Google各种途径,看了FAQ,作者建议是手动安装+手动拼接命令行启动。但是,有些麻烦,不喜欢(任性)
后面,看到了这个Issue: Error: Unable to access jarfile /root/.arthas/lib/3.0.4/arthas/arthas-core.jar。咦这不就是我共患难的兄弟吗?马上点进去。看到大神ralf0131的回答,顿时茅厕塞顿开:
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First, please ensure /root/.arthas/lib/3.0.4/arthas/arthas-core.jar does exist. |
cd到/root/.arthas/lib/3.0.4,发现目录下没有jar包。尝不到这瓜有点不甘心,只好手动安装了(真香~)
当前最新的包是3.0.4。下载,解压:
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[root@bogon 3.0.4]# wget https://maven.aliyun.com/repository/public/com/taobao/arthas/arthas-packaging/3.0.4/arthas-packaging-3.0.4-bin.zip......[root@bogon 3.0.4]# unzip arthas-packaging-3.0.4-bin.zip -bash: unzip: command not found |
好吧,我装,我解压……
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[root@bogon 3.0.4]# yum -y install unzip[root@bogon 3.0.4]# unzip arthas-packaging-3.0.4-bin.zip |
顿时发现,刚才不是说/root/.arthas/lib/3.0.4/arthas路径下木有jar包吗,刚刚我把jar包解压到/root/.arthas/lib/3.0.4,只要再新建个arthas目录,再把4个jar包移进去就OK了。
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[root@bogon 3.0.4]# mkdir arthas[root@bogon 3.0.4]# mv *.jar arthas/[root@bogon arthas]# ./as.sh |
大功告……你以为这样就结束了?还有问题呢……
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Arthas script version: 3.0.4Found existing java process, please choose one and hit RETURN.* [1]: 1244 test.jarCalculating attach execution time...Attaching to 1244 using version 3.0.4...real 0m0.620suser 0m0.148ssys 0m0.043sAttach success.Connecting to arthas server... current timestamp is 1539615611./as.sh: line 423: type: telnet: not found'telnet' is required. |
还要装telnet-client……
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[root@bogon 3.0.4]yum -y install telnet.x86_64 |
最后再启动,回车,大功告成!
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[root@bogon arthas]# ./as.sh Arthas script version: 3.0.4Found existing java process, please choose one and hit RETURN.* [1]: 1244 test.jarCalculating attach execution time...Attaching to 1244 using version 3.0.4...real 0m0.132suser 0m0.050ssys 0m0.113sAttach success.Connecting to arthas server... current timestamp is 1539615853Trying 127.0.0.1...Connected to 127.0.0.1.Escape character is '^]'. ,---. ,------. ,--------.,--. ,--. ,---. ,---. / O | .--. ''--. .--'| '--' | / O ' .-' | .-. || '--'.' | | | .--. || .-. |`. `-. | | | || | | | | | | || | | |.-' | `--' `--'`--' '--' `--' `--' `--'`--' `--'`-----' wiki: https://alibaba.github.io/arthasversion: 3.0.4pid: 1244timestamp: 1539615854095$ |
接下来就可以各种命令各种姿势各种把弄了……
总结:
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安装arthas前需要装JDK,配置好JAVA_HOME等环境变量,以及telnet。unzip看情况,如果你解压完再上传到服务器,也行……
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不知道是bug还是神马情况,按照文档的步骤再一次装在测试的服务器上,程序正常运行,没有报Error: Unable to access jarfile /root/.arthas/lib/3.0.4/arthas/arthas-core.jar的错误,4个jar包都在预期的路径。简单来说,有的机器运行./as.sh是会因少jar包报错的,有的是会正常运行的,具体情况具体分析。后期继续关注arthas的GitHub动态,看项目的最新进展。
就酱。睡觉……