Multiple commands during docker run

Question

I am new to docker and I created a docker image which runs a rails app. Now I want to run the app in background as a deamon, but it keeps on bailing out on me:

docker run -d -p 2000:2000 image_name "source ~/.bash_profile; cd src; rails s"

As you can see, my rails app is in the src directory.

I have also tried adding the rails path in the bashrc for the docker image, still it errors out as below:

Can somebody please correct me.

Can you post the exact error message ? You should use either the CMD docs.docker.com/reference/builder/#cmd or the ENTRYPOINT docs.docker.com/reference/builder/#entrypoint in your Dockerfile to launch your rails application, have a look at for example this Dockerfile registry.hub.docker.com/u/michilu/timecard-rails/dockerfile — user2915097
– user2915097, Commented Feb 11, 2015 at 7:22
As a workaround here is what I did: docker run --name app -d -w /src -p 3000:3000 image_name /root/ruby/rails s However, I will look into ENTRYPOINT and send an update. — Jason
– Jason, Commented Feb 11, 2015 at 17:42

Vor · Accepted Answer · 2015-02-11 16:23:53Z

1

You can wrap your commands in something like startup.sh, then make it executable. Then simply call docker run -d -p 2000:2000 image_name startup.sh or if you want to always run this command when the container is started, take a look at CMD and ENTRYPOINT commands.

Also keep in mind that to keep docker containers running, you need to keep a process active in the foreground.

answered Feb 11, 2015 at 16:23

Vor

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Mingjiang Shi · Accepted Answer · 2015-06-29 03:20:20Z

0

Try the following approach:

docker run -d -p 2000:2000 image_name sh -c 'source ~/.bash_profile; cd src; rails s'

This is because docker doesn't support running multiple commands, while "sh -c " is one command.

Reference: http://timmurphy.org/2015/02/27/running-multiple-programs-in-a-docker-container-from-the-command-line/

answered Jun 29, 2015 at 3:20

Mingjiang Shi

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