Running Disco in a Docker container

I need to run a run a Python script in a Docker container (I currently have execution of “disco_test.py” as my ENTRYPOINT command) that will utilize Disco (which of course needs to be running in that container). The problem is I cannot seem to get Disco running either with CMD or RUN in the Dockerfile, or from within the Python script itself (using the subprocess module).

If, however, I create an otherwise identical image with no ENTRYPOINT command, run it with docker run -i -t disco_test /bin/bash and then open a Python shell, I can successfully get Disco running using the subprocess module (simply using call(["disco", "start"]) works). Upon exiting the Python shell I can indeed verify that Disco is still running properly (disco status reports “Master 0cfddb8fb0e4:8989 running”). When I attempt to start Disco in the same way (using call(["disco", "start"])) from within “disco_test.py”, which I execute as the ENTRYPOINT command, it doesn’t work! It will print “Master 0cfddb8fb0e4:8989 started”, however checking disco status afterwards ALWAYS shows “Master 0cfddb8fb0e4:8989 stopped”.

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    Any insights or suggestions would be greatly appreciated!

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  • One Solution collect form web for “Running Disco in a Docker container”

    I would guess that its running daemonized and exits immediately stopping the container. You could try these containers dockerized disco . It uses supervisor to run disco.

    Docker will be the best open platform for developers and sysadmins to build, ship, and run distributed applications.