Dockerfile CMD 指令将在运行后立即退出容器 [英] Dockerfile CMD instruction will exit the container just after running it
问题描述
我想在我的容器启动时设置一些配置，为此我使用的是 shell 脚本.但是我的容器将在我的脚本结束后立即退出，我尝试使用 -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
不带任何标志运行
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
Run with -itd flags
docker run -itd hello-docker
如下所示，我的控制台输出，这一次也将很快退出.:(
and as below my console output, This time also will exits soon. :(
我在 COMMAND 部分看到的不同之处在于，当我运行其他图像时，命令部分将显示/bin/bash"，并将继续以分离模式运行.
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 脚本在容器中运行我的图像时，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.
我想运行容器直到我不手动停止它.
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 这里
As per docker documentation here
当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一些参数运行 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，我得到了最好的结果，如下所示
Finally with some experiments I got my best result as below
我的 Dockerfile 没有任何问题，如下所示是正确的.
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
为了得到预期的结果，我只需在我的 shell 脚本文件中添加一个命令(/bin/bash)，如下所示，然后一切都以我最好的方式运行.
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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