Running a script inside a docker container using shell script

Question

I am trying to create a shell script for setting up a docker container  My script file looks like     bin bash  docker run -t -i -p 5902 5902 --name  mycontainer  --privileged myImage new  bin bash   Running this script file will run the container in a newly invoked bash   Now I need to run a script file  test sh which is already inside container from the above given shell script  eg  cd  path to test sh  amp  amp    test sh  How to do that

User · Answer

Have a look at entry points too  You will be able to use multiple CMD  https   docs docker com engine reference builder   entrypoint

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You can run a command in a running container using docker exec  OPTIONS  CONTAINER COMMAND  ARG      docker exec mycontainer  path to test sh  And to run from a bash session  docker exec -it mycontainer  bin bash  From there you can run your script

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If you want to run the same command on multiple instances you can do this    for i in c1 dm1 dm2 ds1 ds2 gtm m gtm sl  do docker exec -it  i  bin bash -c  service sshd start   done

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Assuming that your docker container is up and running  you can run commands as   docker exec mycontainer  bin sh -c  cmd1 cmd2     cmdn

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You could also mount a local directory into your docker image and source the script in your  bashrc  Don t forget the script has to consist of functions unless you want it to execute on every new shell   This is outdated see the update notice    I m using this solution to be able to update the script outside of the docker instance  This way I don t have to rerun the image if changes occur  I just open a new shell   Got rid of reopening a shell - see the update notice   Here is how you bind your current directory   docker run -it -v  PWD  scripts  my docker build  bin bash   Now your current directory is bound to  scripts of your docker instance    Outdated  To save your  bashrc changes commit your working image with this command   docker commit  container id  my docker build   Update  To solve the issue to open up a new shell for every change I now do the following   In the dockerfile itself I add RUN echo   scripts bashrc   gt   root  bashrc   Inside zshrc I export the scripts directory to the path  The scripts directory now contains multiple files instead of one  Now I can directly call all scripts without having open a sub shell on every change   BTW you can define the history file outside of your container too  This way it s not necessary to commit on a bash change anymore

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In case you don t want  or have   a running container  you can call your script directly with the run command   Remove the iterative tty -i -t arguments and use this         docker run ubuntu bionic  bin bash  path to script sh   This will  didn t test  also work for other scripts         docker run ubuntu bionic  usr bin python  path to script py

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I was searching an answer for this same question and found ENTRYPOINT in Dockerfile solution for me   Dockerfile      ENTRYPOINT  my-script sh    my-script2 sh    bin bash   Now the scripts are executed when I start the container and I get the bash prompt after the scripts has been executed

[bash] Running a script inside a docker container using shell script

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