Run a script in Dockerfile

Question

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   quot  bin bash quot    quot  bootstrap sh quot    Also this way  FROM php 7-fpm     ADD bootstrap sh   RUN bash -c  quot  bootstrap sh quot   And also by executing my running container  docker exec symfony  bin bash -c  quot  bootstrap sh quot   Nothing seems to work  Do you know how to do it

User · Answer

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

User · Answer

RUN and ENTRYPOINT are two different ways to execute a script  RUN means it creates an intermediate container  runs the script and freeze the new state of that container in a new intermediate image  The script won t be run after that  your final image is supposed to reflect the result of that script  ENTRYPOINT means your image  which has not executed the script yet  will create a container  and runs that script  In both cases  the script needs to be added  and a RUN chmod  x  bootstrap sh is a good idea  It should also start with a shebang  like    bin sh  Considering your script  bootstrap sh  a couple of git config --global commands   it would be best to RUN that script once in your Dockerfile  but making sure to use the right user  the global git config file is  HOME   gitconfig  which by default is the  root one  Add to your Dockerfile  RUN  bootstrap sh  Then  when running a container  check the content of  root  gitconfig to confirm the script was run

User · Answer

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

User · Answer

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

User · Answer

WORKDIR  scripts COPY bootstrap sh   RUN   bootstrap sh

[docker] Run a script in Dockerfile

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