I'm building a new Docker image based on the standard Ubuntu 14.04 image.

Here's my Dockerfile :

FROM ubuntu:14.04
RUN apt-get update -y
RUN apt-get install -y nginx git python-setuptools python-dev
RUN easy_install pip
ADD . /code
WORKDIR /code
RUN pip install -r requirements.txt # only 'django' for now
ENV projectname myproject
EXPOSE 80 8000
WORKDIR ${projectname}
CMD ['python', 'manage.py', 'runserver', '0.0.0.0:80']
When I try to run this image, I get this error...
  
/bin/sh: 1: [python,: not found
But if I open a shell when running the image, running python opens the interactive prompt as expected. 
Why can't I invoke python through CMD in the Dockerfile?
                @E-ebolavirus No, that's not the issue. Python is installed. I can invoke it just fine by changing the single quotes to double quotes.
                    – Joe Mornin
                Sep 22 '15 at 5:42
I had the same error. But in my case it was syntax error in command.
Had CMD ["python" "app.py"] instead of CMD ["python", "app.py"]
Validating the yaml file format can help in this case. Can use any online yaml validator.
        
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