[docker] Run a script in Dockerfile

I'm trying to run a script during my building process in my Dockerfile. But it doesn't seems to work.

I tried that way:

FROM php:7-fpm
ADD bootstrap.sh /
ENTRYPOINT ["/bin/bash", "/bootstrap.sh"]

Also this way:

FROM php:7-fpm    
ADD bootstrap.sh /
RUN bash -c "/bootstrap.sh"

And also by executing my running container:

docker exec symfony /bin/bash -c "/bootstrap.sh"

Nothing seems to work.

Do you know how to do it?

Try to create script with ADD command and specification of working directory Like this("script" is the name of script and /root/script.sh is where you want it in the container, it can be different path:

ADD script.sh /root/script.sh

In this case ADD has to come before CMD, if you have one BTW it's cool way to import scripts to any location in container from host machine

In CMD place [./script]

It should automatically execute your script

You can also specify WORKDIR as /root, then you'l be automatically placed in root, upon starting a container

In addition to the answers above:

If you created/edited your .sh script file in Windows, make sure it was saved with line ending in Unix format. By default many editors in Windows will convert Unix line endings to Windows format and Linux will not recognize shebang (#!/bin/sh) at the beginning of the file. So Linux will produce the error message like if there is no shebang.

Tips:

• If you use Notepad++, you need to click "Edit/EOL Conversion/UNIX (LF)"
• If you use Visual Studio, I would suggest installing "End Of Line" plugin. Then you can make line endings visible by pressing Ctrl-R, Ctrl-W. And to set Linux style endings you can press Ctrl-R, Ctrl-L. For Windows style, press Ctrl-R, Ctrl-C.

It's best practice to use COPY instead of ADD when you're copying from the local file system to the image. Also, I'd recommend creating a sub-folder to place your content into. If nothing else, it keeps things tidy. Make sure you mark the script as executable using chmod.

Here, I am creating a scripts sub-folder to place my script into and run it from:

RUN mkdir -p /scripts
COPY script.sh /scripts
WORKDIR /scripts
RUN chmod +x script.sh
RUN script.sh

WORKDIR /scripts
COPY bootstrap.sh .
RUN ./bootstrap.sh