在docker中,运行Jcmd命令,报错

 

 起因:

 想调整JVM的设置,观察一下当前jvm进程的资源情况。

 输入:docker exec -it xxxxx /bin/sh

 输入: jcmd 1 help ,报错

com.sun.tools.attach.AttachNotSupportedException: Unable to get pid of LinuxThreads manager thread
    at sun.tools.attach.LinuxVirtualMachine.<init>(LinuxVirtualMachine.java:86)
    at sun.tools.attach.LinuxAttachProvider.attachVirtualMachine(LinuxAttachProvider.java:63)
    at com.sun.tools.attach.VirtualMachine.attach(VirtualMachine.java:208)
    at sun.tools.jcmd.JCmd.executeCommandForPid(JCmd.java:147)
    at sun.tools.jcmd.JCmd.main(JCmd.java:131)

 

根本原因:

    进程1 编号是Linux定义的管理进程

解决办法:

    重新添加JDK基础镜像

FROM openjdk:8-jdk-alpine

LABEL MAINTAINER="cn-coder(https://www.cnblogs.com/cn-coder)"

RUN echo "http://mirrors.aliyun.com/alpine/latest-stable/main/" > /etc/apk/repositories
RUN echo "http://mirrors.aliyun.com/alpine/latest-stable/community/" >> /etc/apk/repositories

RUN apk update && \
             apk add --no-cache tini
             
ENTRYPOINT ["/sbin/tini", "--"]

 

  


posted @ 2020-11-20 13:35  潇水鱼米  阅读(623)  评论(0编辑  收藏  举报