Docker Dockerfile 验证Docker内部使用jmap报错问题解决

今天药忘吃喽~ 2022-10-12 01:26 414阅读 0赞

对于线上排查问题，如果不能轻松使用一些Java命令行工具真的有点崩溃。

**目录**

异常信息

类型一：Can't attach to the process

类型二：unknown CollectedHeap type

实验验证

先决条件

Dockerfile创建

镜像创建

运行示例

进入容器测试jmap

参考文章

--------------------

## 异常信息 ##

### 类型一：Can't attach to the process ###

Caused by: sun.jvm.hotspot.debugger.DebuggerException: Can't attach to the process: ptrace(PTRACE\_ATTACH, ..) failed for 14: 不允许的操作

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Jvb255YQ_size_16_color_FFFFFF_t_70][]

### 类型二：unknown CollectedHeap type ###

Caused by: java.lang.RuntimeException: unknown CollectedHeap type : class sun.jvm.hotspot.gc\_interface.CollectedHeap

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Jvb255YQ_size_16_color_FFFFFF_t_70 1][]

## 实验验证 ##

### 先决条件 ###

![20210702160622255.png][]

### Dockerfile创建 ###

FROM ubuntu:20.04
    MAINTAINER boonya <boonya@sina.com>
    # now add java and tomcat support in the container
    ADD jdk-8u291-linux-x64.tar.gz /usr/local/
    #持久化到指定目录
    VOLUME /tmp
    # 将工程jar包（springboot-angular-0.0.1-SNAPSHOT.jar）拷贝到 app.jar中
    ADD springboot-angular-0.0.1-SNAPSHOT.jar /app.jar
    # configuration of java and tomcat ENV
    ENV JAVA_HOME /usr/local/jdk1.8.0_291
    ENV CLASSPATH $JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
    ENV PATH $PATH:$JAVA_HOME/bin
    # container listener port
    EXPOSE 8080
    # 执行jar包  "-Djava.security.egd=file:/dev/./urandom"加快随机数产生过程
    ENTRYPOINT ["java","-Djava.security.egd=file:/dev/./urandom","-jar","/app.jar"]

### 镜像创建 ###

[root@boonya java]# docker build -t boonya/springboot-angular .
    Sending build context to Docker daemon  527.8MB
    Step 1/10 : FROM ubuntu:15.06
    manifest for ubuntu:15.06 not found: manifest unknown: manifest unknown
    [root@boonya java]# vi Dockerfile 
    [root@boonya java]# docker build -t boonya/springboot-angular .
    Sending build context to Docker daemon  527.8MB
    Step 1/10 : FROM ubuntu:20.04
    20.04: Pulling from library/ubuntu
    c549ccf8d472: Pull complete 
    Digest: sha256:aba80b77e27148d99c034a987e7da3a287ed455390352663418c0f2ed40417fe
    Status: Downloaded newer image for ubuntu:20.04
     ---> 9873176a8ff5
    Step 2/10 : MAINTAINER boonya <boonya@sina.com>
     ---> Running in 7022c0ee27cd
    Removing intermediate container 7022c0ee27cd
     ---> 54cc9700971d
    Step 3/10 : ADD jdk-8u291-linux-x64.tar.gz /usr/local/
     ---> 6961cba3491b
    Step 4/10 : VOLUME /tmp
     ---> Running in 96b64b89d45d
    Removing intermediate container 96b64b89d45d
     ---> ac1b616b2604
    Step 5/10 : ADD springboot-angular-0.0.1-SNAPSHOT.jar /app.jar
     ---> 363ea3074b32
    Step 6/10 : ENV JAVA_HOME /usr/local/jdk1.8.0_291
     ---> Running in 8aadc23e5bc5
    Removing intermediate container 8aadc23e5bc5
     ---> 0b96e2a88e16
    Step 7/10 : ENV CLASSPATH $JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
     ---> Running in ba105757392a
    Removing intermediate container ba105757392a
     ---> d5f74064a5ca
    Step 8/10 : ENV PATH $PATH:$JAVA_HOME/bin
     ---> Running in 9c713c0c1d58
    Removing intermediate container 9c713c0c1d58
     ---> 1f36c428ee4d
    Step 9/10 : EXPOSE 8080
     ---> Running in ea0689d40009
    Removing intermediate container ea0689d40009
     ---> 8bfcd6e364af
    Step 10/10 : ENTRYPOINT ["java","-Djava.security.egd=file:/dev/./urandom","-jar","/app.jar"]
     ---> Running in 9310b710652d
    Removing intermediate container 9310b710652d
     ---> 985346a8bf9d
    Successfully built 985346a8bf9d
    Successfully tagged boonya/springboot-angular:latest

### 运行示例 ###

[root@boonya java]# docker run -p 8080:8080 --name sa boonya/springboot-angular:latest --cap-add=SYS_PTRACE
    
      .   ____          _            __ _ _
     /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
    ( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
     \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
      '  |____| .__|_| |_|_| |_\__, | / / / /
     =========|_|==============|___/=/_/_/_/
     :: Spring Boot ::                (v2.5.0)
    
    2021-07-02 06:43:05.895  INFO 1 --- [           main] c.b.s.a.SpringbootAngularApplication     : Starting SpringbootAngularApplication v0.0.1-SNAPSHOT using Java 1.8.0_291 on c0a283afb31b with PID 1 (/app.jar started by root in /)
    2021-07-02 06:43:05.900  INFO 1 --- [           main] c.b.s.a.SpringbootAngularApplication     : No active profile set, falling back to default profiles: default
    2021-07-02 06:43:07.596  INFO 1 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8080 (http)
    2021-07-02 06:43:07.619  INFO 1 --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
    2021-07-02 06:43:07.619  INFO 1 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet engine: [Apache Tomcat/9.0.46]
    2021-07-02 06:43:07.680  INFO 1 --- [           main] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
    2021-07-02 06:43:07.680  INFO 1 --- [           main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 1719 ms
    2021-07-02 06:43:08.083  INFO 1 --- [           main] o.s.b.a.w.s.WelcomePageHandlerMapping    : Adding welcome page: class path resource [static/index.html]
    2021-07-02 06:43:08.248  INFO 1 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 8080 (http) with context path ''
    2021-07-02 06:43:08.270  INFO 1 --- [           main] c.b.s.a.SpringbootAngularApplication     : Started SpringbootAngularApplication in 3.296 seconds (JVM running for 3.894)
    2021-07-02 06:43:08.278  INFO 1 --- [           main] o.s.b.a.ApplicationAvailabilityBean      : Application availability state LivenessState changed to CORRECT
    2021-07-02 06:43:08.281  INFO 1 --- [           main] o.s.b.a.ApplicationAvailabilityBean      : Application availability state ReadinessState changed to ACCEPTING_TRAFFIC

### 进入容器测试jmap ###

[root@boonya java]# docker exec -it sa  /bin/sh
    # jps
    1 jar
    43 Jps
    # jp^Hm^H^H^H
    /bin/sh: 2:: not found
    # jmap -heap 1
    Attaching to process ID 1, please wait...
    Debugger attached successfully.
    Server compiler detected.
    JVM version is 25.291-b10
    
    using thread-local object allocation.
    Parallel GC with 2 thread(s)
    
    Heap Configuration:
       MinHeapFreeRatio         = 0
       MaxHeapFreeRatio         = 100
       MaxHeapSize              = 981467136 (936.0MB)
       NewSize                  = 20971520 (20.0MB)
       MaxNewSize               = 327155712 (312.0MB)
       OldSize                  = 41943040 (40.0MB)
       NewRatio                 = 2
       SurvivorRatio            = 8
       MetaspaceSize            = 21807104 (20.796875MB)
       CompressedClassSpaceSize = 1073741824 (1024.0MB)
       MaxMetaspaceSize         = 17592186044415 MB
       G1HeapRegionSize         = 0 (0.0MB)
    
    Heap Usage:
    PS Young Generation
    Eden Space:
       capacity = 125829120 (120.0MB)
       used     = 120039720 (114.47879791259766MB)
       free     = 5789400 (5.521202087402344MB)
       95.39899826049805% used
    From Space:
       capacity = 6291456 (6.0MB)
       used     = 0 (0.0MB)
       free     = 6291456 (6.0MB)
       0.0% used
    To Space:
       capacity = 6815744 (6.5MB)
       used     = 0 (0.0MB)
       free     = 6815744 (6.5MB)
       0.0% used
    PS Old Generation
       capacity = 36175872 (34.5MB)
       used     = 9333400 (8.901023864746094MB)
       free     = 26842472 (25.598976135253906MB)
       25.800069173177082% used
    
    11384 interned Strings occupying 967408 bytes.

## 参考文章 ##

[https://blog.csdn.net/russle/article/details/99708261][https_blog.csdn.net_russle_article_details_99708261]

[https://www.jb51.net/article/201430.htm][https_www.jb51.net_article_201430.htm]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Jvb255YQ_size_16_color_FFFFFF_t_70]: /images/20221005/c10c23668d624de397c69ef61ab10752.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Jvb255YQ_size_16_color_FFFFFF_t_70 1]: /images/20221005/b7c2e4f9f4dd4f23acdc1324e38cbb47.png
[20210702160622255.png]: /images/20221005/1328df4930fb4303b170ec3be377fc95.png
[https_blog.csdn.net_russle_article_details_99708261]: https://blog.csdn.net/russle/article/details/99708261
[https_www.jb51.net_article_201430.htm]: https://www.jb51.net/article/201430.htm