【原创】大叔经验分享（89）docker启动openjdk执行jmap报错

时间：2022-02-14 20:05:19

docker启动openjdk后，可以查看进程

# docker exec -it XXX jps

10 XXX.jar

可见启动的java进程id一直为10，然后可以执行jvm命令，比如

# docker exec -it XXX jstack 10

# docker exec -it XXX jstat -gcutil 10

# docker exec -it XXX jmap -histo 10

但是执行jmap -heap或者-dump时会报错：

Attaching to process ID 10, please wait...

Error attaching to process: sun.jvm.hotspot.debugger.DebuggerException: Can't attach to the process: ptrace(PTRACE_ATTACH, ..) failed for 10: Operation not permitted

sun.jvm.hotspot.debugger.DebuggerException: sun.jvm.hotspot.debugger.DebuggerException: Can't attach to the process: ptrace(PTRACE_ATTACH, ..) failed for 10: Operation not permitted

    at sun.jvm.hotspot.debugger.linux.LinuxDebuggerLocal$LinuxDebuggerLocalWorkerThread.execute(LinuxDebuggerLocal.java:163)

    at sun.jvm.hotspot.debugger.linux.LinuxDebuggerLocal.attach(LinuxDebuggerLocal.java:278)

    at sun.jvm.hotspot.HotSpotAgent.attachDebugger(HotSpotAgent.java:671)

    at sun.jvm.hotspot.HotSpotAgent.setupDebuggerLinux(HotSpotAgent.java:611)

    at sun.jvm.hotspot.HotSpotAgent.setupDebugger(HotSpotAgent.java:337)

    at sun.jvm.hotspot.HotSpotAgent.go(HotSpotAgent.java:304)

    at sun.jvm.hotspot.HotSpotAgent.attach(HotSpotAgent.java:140)

    at sun.jvm.hotspot.tools.Tool.start(Tool.java:185)

    at sun.jvm.hotspot.tools.Tool.execute(Tool.java:118)

    at sun.jvm.hotspot.tools.HeapSummary.main(HeapSummary.java:49)

    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 sun.tools.jmap.JMap.runTool(JMap.java:201)

    at sun.tools.jmap.JMap.main(JMap.java:130)

Caused by: sun.jvm.hotspot.debugger.DebuggerException: Can't attach to the process: ptrace(PTRACE_ATTACH, ..) failed for 10: Operation not permitted

    at sun.jvm.hotspot.debugger.linux.LinuxDebuggerLocal.attach0(Native Method)

    at sun.jvm.hotspot.debugger.linux.LinuxDebuggerLocal.access$100(LinuxDebuggerLocal.java:62)

    at sun.jvm.hotspot.debugger.linux.LinuxDebuggerLocal$1AttachTask.doit(LinuxDebuggerLocal.java:269)

    at sun.jvm.hotspot.debugger.linux.LinuxDebuggerLocal$LinuxDebuggerLocalWorkerThread.run(LinuxDebuggerLocal.java:138)

这是因为docker禁用了ptrace，

1）如果手工通过docker命令启动，增加参数

# docker run --cap-add SYS_PTRACE ...

2）如果通过marathon启动

【原创】大叔经验分享（89）docker启动openjdk执行jmap报错

然后问题修复

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