我有由HashiCorp Nomad运行的java应用程序。在进程状态输出中,我有root
运行的nomad执行程序进程和nobody
运行的java应用程序进程。
当我尝试执行命令时:
jmap -dump:format=b,file=filename.bin <app_pid>
我收到了消息:
Unable to open socket file: target process not responding or HotSpot VM not loaded
The -F option can be used when the target process is not responding
当我尝试执行命令时:jmap -dump:format=b,file=filename.bin <app_pid> -F
我接下来追踪:
Attaching to core -F from executable 5584, please wait...
Error attaching to core file: cannot open binary file
sun.jvm.hotspot.debugger.DebuggerException: cannot open binary file
at sun.jvm.hotspot.debugger.linux.LinuxDebuggerLocal.attach0(Native Method)
at sun.jvm.hotspot.debugger.linux.LinuxDebuggerLocal.attach(LinuxDebuggerLocal.java:286)
at sun.jvm.hotspot.HotSpotAgent.attachDebugger(HotSpotAgent.java:673)
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:156)
at sun.jvm.hotspot.tools.Tool.start(Tool.java:191)
at sun.jvm.hotspot.tools.Tool.execute(Tool.java:118)
at sun.jvm.hotspot.tools.HeapDumper.main(HeapDumper.java:83)
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)
答案 0 :(得分:1)
jmap
应该由与目标Java进程相同的用户运行(在您的情况下为nobody
)。
jmap -F
应由root运行,-F
参数应位于<app_pid>
之前:
jmap -dump:format=b,file=filename.bin -F <app_pid>
请参阅this answers中的详细信息。