Access docker image through web server

I am using a docker image and I can successfully access it and run it through a python script from my host machine. I am using sidomo for that purpose. The script works fine locally but doesn't give any output when I run it on server. Even the docker images command doesn't give correct output on server. The output is:

Cannot connect to the Docker daemon. Is the docker daemon running on this host?

What permissions do I need to change in order to access my docker image from server? I only need the output from the docker program in my web application.