Dockerfile CMD指令将在运行容器后立即退出容器 [英] Dockerfile CMD instruction will exit the container just after running it
问题描述
我想在容器启动时设置一些配置，为此，我正在使用shell脚本.但是，一旦脚本结束，我的容器就会退出，我曾尝试使用-d标志/分离模式，但它永远不会在分离模式下运行.
I want to setup some configuration when my container starts, for this I am using shell scripts. But my container will exits as soon as my scripts ends, I have tried with -d flag / detached mode but It will never run in detached mode.
下面是我的Dockerfile
Below is my Dockerfile
FROM ubuntu:14.04
ADD shell.sh /usr/local/bin/shell.sh
RUN chmod 777 /usr/local/bin/shell.sh
CMD /usr/local/bin/shell.sh
下面是我的shell脚本
Below is my shell script
#!/bin/bash
echo Hello-docker
-
运行时没有任何标志
Run without any flag
docker run hello-docker
这将在我的控制台上打印'Hello-docker'并退出
This will print 'Hello-docker' on my console and exits
使用-itd标志运行
docker run -itd hello-docker
，并在我的控制台输出下方，这一次也将很快退出. :(
and as below my console output, This time also will exits soon. :(
-
当我运行其他图像时，我看到的区别是在COMMAND部分中，命令部分将显示"/bin/bash"，并在分离模式下继续.
The difference I saw is in COMMAND section when I run other images command section will shows "/bin/bash" and will continue in detached mode.
当我使用shell脚本在容器中运行映像时，COMMAND部分将显示"/bin/sh -c/usr/loca"，然后退出.
And when I run my image in container with shell script COMMAND section will show "/bin/sh -c /usr/loca", and Exit.
我要运行容器，直到不手动停止它为止.
I want to run container till I not stop it manually.
在Dockerfile中添加ENTRYPOINT指令后，这将不会执行我的shell脚本:(
After adding ENTRYPOINT instruction in Dockerfile, this will not execute my shell script :(
FROM ubuntu:14.04
ADD shell.sh /usr/local/bin/shell.sh
RUN chmod 777 /usr/local/bin/shell.sh
CMD /usr/local/bin/shell.sh
ENTRYPOINT /bin/bash
根据docker文档此处
As per docker documentation here
使用替代参数运行容器时，CMD将被覆盖，因此，如果我使用以下某些参数运行docker image，将不会执行CMD指令. :(
CMD will be overridden when running the container with alternative arguments, so If I run docker image with some arguments as below, will not execute CMD instructions. :(
sudo docker run -it --entrypoint=/bin/bash <imagename>
推荐答案
最后通过一些实验，我得到了如下最佳结果
Finally with some experiments I got my best result as below
我的Dockerfile没什么问题，如下所示.
There is nothing wrong with my Dockerfile as below it's correct.
FROM ubuntu:14.04
ADD shell.sh /usr/local/bin/shell.sh
RUN chmod 777 /usr/local/bin/shell.sh
CMD /usr/local/bin/shell.sh
要获得预期的结果，我只是在外壳脚本文件中添加了一个命令(/bin/bash)，如下所示，一切都以我最好的方式进行.
What I do to get expected result is, I just add one more command(/bin/bash) in my shell script file as below and vola everything works in my best way.
#!/bin/bash
echo "Hello-docker" > /usr/hello.txt
/bin/bash
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