嗨,我是Docker的新手,并尝试从头开始编写新图像.我正在编写这个dockerFile来编译和运行同一目录中可用的简单java程序.
这是dockerfile.
FROM scratch
CMD javac HelloWorld.java
CMD java HelloWorld
Docker构建成功,如下所示
[root@hadoop01 myjavadir]# docker build -t runhelloworld .
Sending build context to Docker daemon 3.072 kB
Sending build context to Docker daemon
Step 0 : FROM scratch
--->
Step 1 : CMD javac HelloWorld.java
---> Running in 7298ad7e902f
---> f5278ae25f0c
Removing intermediate container 7298ad7e902f
Step 2 : CMD java HelloWorld
---> Running in 0fa2151dc7b0
---> 25453e89b3f0
Removing intermediate container 0fa2151dc7b0
Successfully built 25453e89b3f0
但是当我尝试运行时,它会抛出以下错误：
[root@hadoop01 myjavadir]# docker run runhelloworld
exec: "/bin/sh": stat /bin/sh: no such file or directory
Error response from daemon: Cannot start container 676717677d3f1bf3b0b000d68b60c32826939b8c6ec1b5f2e9876969c60e22a4: [8] System error: exec: "/bin/sh": stat /bin/sh: no such file or directory
[root@hadoop01 myjavadir]# exec: "/bin/sh": stat /bin/sh: no such file or directory
bash: exec:: command not found
请帮忙解决同样的问题.
将第二行转换为RUN后更新.
[root@hadoop01 myjavadir]# docker build -t runhelloworld .
Sending build context to Docker daemon 3.584 kB
Sending build context to Docker daemon
Step 0 : FROM scratch
--->
Step 1 : RUN javac HelloWorld.java
---> Running in fdef2d65ac58
exec: "/bin/sh": stat /bin/sh: no such file or directory [8]
System error: exec: "/bin/sh": stat /bin/sh: no such file or directory
说明
从Dockerfile reference.
There can only be one CMD instruction in a Dockerfile. If you list
more than one CMD then only the last CMD will take effect.
这就是为什么没有执行javac命令并启动容器导致没有找到这样的文件或目录.
CMD和ENTRYPOINT用于执行容器(入口点级别)后应启动的任务.
The main purpose of a CMD is to provide defaults for an executing container.
这适用于行CMD java HelloWorld,但不适用于CMD javac HelloWorld.java,它更像是构建步骤.这就是RUN的用途.
解
将第二行更改为RUN javac HelloWorld.java.
FROM scratch
RUN javac HelloWorld.java
CMD java HelloWorld
The resulting committed image [from line two] will be used for
the next step in the Dockerfile.
更新
正如Diyoda所指出的,确保FROM映像提供java.
