使用hengyunabc/arthas:latest这个镜像不能查询到jvm进程

[aylei]

使用hengyunabc/arthas:latest这个镜像不能查询到jvm进程

[aylei]

Could you please provide the detailed commands executed?

[ly-wjj]

如果使用arthas镜像调式java程序呢？
执行过程如下：
kubectl debug -n java-demo --image hengyunabc/arthas:latest /bin/sh
然后进入容器后，执行命令
cd /opt/arthas
java -jar arthas-boot.jar 9
返回结果
INFO] arthas-boot version: 3.2.0
[INFO] arthas home: /opt/arthas
[INFO] Try to attach process 9
[ERROR] Start arthas failed, exception stack trace:
com.sun.tools.attach.AttachNotSupportedException: Unable to open socket file: target process not responding or HotSpot VM not loaded
at sun.tools.attach.LinuxVirtualMachine.(LinuxVirtualMachine.java:106)
at sun.tools.attach.LinuxAttachProvider.attachVirtualMachine(LinuxAttachProvider.java:63)
at com.sun.tools.attach.VirtualMachine.attach(VirtualMachine.java:208)
at com.taobao.arthas.core.Arthas.attachAgent(Arthas.java:83)
at com.taobao.arthas.core.Arthas.(Arthas.java:28)
at com.taobao.arthas.core.Arthas.main(Arthas.java:123)
[INFO] Attach process 9 success.
[INFO] arthas-client connect 127.0.0.1 3658
Connect to telnet server error: 127.0.0.1 3658
java.net.ConnectException: Connection refused (Connection refused)
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:589)
at org.apache.commons.net.SocketClient.connect(SocketClient.java:188)
at org.apache.commons.net.SocketClient.connect(SocketClient.java:209)
at com.taobao.arthas.client.TelnetConsole.main(TelnetConsole.java:249)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.taobao.arthas.boot.Bootstrap.main(Bootstrap.java:547)
Usage: arthas-client [-h ] [--help] [-c ] [-f ] [-w
] [target-ip] [port]

[ArthurYangZhiBin]

现在就是使用arthas进去都找不到java的进程pid，就别说调试程序了

…

------------------&nbsp;原始邮件&nbsp;------------------ 发件人:&nbsp;"ly-wjj"<[email protected]&gt;; 发送时间:&nbsp;2020年4月15日(星期三) 晚上7:52 收件人:&nbsp;"aylei/kubectl-debug"<[email protected]&gt;; 抄送:&nbsp;"明天的我"<[email protected]&gt;;"Author"<[email protected]&gt;; 主题:&nbsp;Re: [aylei/kubectl-debug] 使用hengyunabc/arthas:latest这个镜像不能查询到jvm进程 (#81) 如果使用arthas镜像调式java程序呢？ — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub, or unsubscribe.

[ly-wjj]

先将arthas的jar包放到对应的文件系统中，然后chroot到对应的文件系统中，进行调试

[aylei]

Also, v0.1.1 lacks the SYS_PTRACE and SYS_ADMIN capabilities, could you please try out v0.2.0-rc?

[morningyi]

试了v0.2.0-rc版本还是同样的报错，最后解决方法如下：
chroot /proc/1/root
sudo -u [USER] jstack [PID]

其中：
[PID] Java进程号
[USER] 执行Java进程的用户，可以通过ps来查看

[laitianliu]

所以现在可以通过kubectl debug调试集群java应用嘛。。 @ @ArthurYangZhiBin

我测试过用openjdk的java启动无法读取pid 为1的进程。采用oracle jdk有效。