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Dockerfile cmd run shell script
Dockerfile cmd run shell script. Learn how to use Dockerfile ENTRYPOINT and CMD instructions to run startup commands in Docker containers in this tutorial! Dockerfile – Run Shell Script. We discussed different approaches using Dockerfile, the docker run command, and the docker-compose run command. In your case your CMD consists of a shell script containing a single echo. 12 && If you want shell processing then either use the shell form or execute a shell directly with the exec form, for example: RUN [ "sh", "-c", "echo $HOME" ]. Finally, for more complex processing, we learned how to create a shell script and execute it in our container. You need to call the shell explicitly: RUN bash -c 'nvm install 0. So the container will exit after completing the echo. For running a bash script when during container creation: Make script. In this example, we have a custom shell script that accepts three command-line arguments ($1, $2 & $3). When using the exec form and executing a shell directly, as in the case for the shell form, it's the shell that's doing the environment variable substitution, not the builder. If you are using windows, you must change script. You can override CMD, for example: sudo docker run -it --entrypoint=/bin/bash <imagename>. In this article, we explored various ways to execute multiple commands on a Docker container. For running a bash script when during container creation: Make script. you commands. sh file convention. That's why shell functions and shell syntax (like cmd1 && cmd2) cannot being used out of the box. . To do this, in Notepad++, go to Edit -> EOL Conversion -> Change from CRLF to LF, and your bash file will be valid for execution. Docker's RUN doesn't start the command in a shell. sh file: #!/bin/bash. A docker container will run as long as the CMD from your Dockerfile takes. The while true loop then runs indefinitely, printing the values of arg1, arg2, and arg3 in each iteration with a one-second delay between each iteration.
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