Docker 在不自动退出容器的情况下运行以在mount中执行脚本？

Question

I have a simple bash script 'test.sh' in the root of mounted folder:

#!/bin/bash
Rscript -e "source('/home/rstudio/mount-folder/src/controller.R')";

However, when i try to mount folder and start the container with docker run as follows:

docker run -d -p 8000:8787 -e ROOT=true -e DISABLE_AUTH=true --name container -v mount-folder/:/home/rstudio/ image_name /home/rstudio/test.sh

above run command starts the container but exits automatically.

I am looking for a docker run command that starts the container, mounts the folder and then executes the bash script which is in the mount-folder without exiting the container.

(** dont want to go with docker exec command as it is not suitable for my use case for other reasons)

Dockerfile:

FROM rocker/rstudio:4.0.2

//some RUN commands to install necessary r packages

EXPOSE 8787

CMD tail -f /dev/null

Other details:

1. Image that i am using is rstudio server from rocker and container runs on AWS ubuntu machine.

Edit:

1. have also tried adding CMD tail -f /dev/null at the end of dockerfile as suggested in http://bigdatums.net/2017/11/07/how-to-keep-docker-containers-running/ even then the container exits.

Answer 1

Docker containers shutdown automatically when run in detached mode. I think this article proposes a nice solution:

http://bigdatums.net/2017/11/07/how-to-keep-docker-containers-running/

You could add tail -f /dev/null as the last command in your bash script instead so that the script will never halt unless it is told to do so.

Answer 2

When you do docker run [options] image_name [cmd] the command you specify becomes the command for the container and replaces any the command specified in the dockerfile (that's why adding CMD tail -f /dev/null doesn't do anything). If you ran your container without the /home/rstudio/test.sh at the end, it should stay running.

The solution would be to update your script to add the tail command at the end.

#!/bin/bash
Rscript -e "source('/home/rstudio/mount-folder/src/controller.R')";
exec tail -f /dev/null

If you can't update that script, you could instead add it to the command being passed to the container, with something like: docker run [options] image_name bash -c '/home/rstudio/test.sh && exec tail -f /dev/null'