Jinja2 Based Dockerfile and Image Generator

pip install jocker==0.0.5



Build Status

Gitter chat



jocker generates Dockerfiles from Jinja2 based template files. You can optionally build an image from the generated file and even more optionally, push it to a hub.


  • must be run sudo-ically due to Docker's sudo requirement!
  • Python 2.6/2.7
  • Docker


pip install jocker


Disclaimer in broken english: This like 5 hours project. Tests yet, No. Hold as test being wroten. Yes.

Well.. there are "some" tests.. but they don't test "build" and "push". ANyways...


jocker -h
Script to run jokcer via command line

    jocker [--varsfile=<path> --templatefile=<path> --outputfile=<path> --dockerconfig=<path> --dryrun -v]
    jocker --version

    -h --help                   Show this screen.
    -f --varsfile=<path>        Path to varsfile (if omitted, will assume "")
    -t --templatefile=<path>    Path to Dockerfile template
    -o --outputfile=<path>      Path to output Dockerfile (if omitted, will assume "Dockerfile")
    -c --dockerconfig=<path>    Path to yaml file containing docker-py configuration
    -d --dryrun                 Whether to actually generate.. or just dryrun
    -b --build=<string>         Image Repository and Tag to build
    -p --push=<string>          Image Repository and Tag to push to (will target --build)
    -v --verbose                a LOT of output (Note: should be used carefully..)
    --version                   Display current version of jocker and exit

Log location

Jocker log files are generated at ~/.jocker/


  • A varsfile containing a dict named VARS should be supplied (if omitted, will default to
  • A templatefile should Jinja2-ly correspond with the variables in the aforementioned VARS dict (if omitted, will default to Dockerfile.template)
  • An outputfile should be given (if omitted, will default to Dockerfile)


If Dryrun is specified, the output of the generated template will be printed. No file will be created.

Build and Push

Note that since, when building, Docker looks for a file named "Dockerfile", the output file must be "Dockerfile" if you want to be able to use the -b flag in conjunction with the generation of the Dockerfile from the template.

You can let jocker know that after the Dockerfile was generated, you'd like to Build a Docker image and optionally Push it to your chosen repository.

Note that for this to work you must be logged in to Docker Hub or your private images repo from your shell.

Also note that for either of these features to work you MUST be sudo'd as it's a prerequisite of Docker.

Also also note that you can't specify both --build and --push as --push triggers a build process anyway.

docker-py configuration for build and push

A dockerconfig yaml file can be specified which includes something like this:

    base_url: 'unix://var/run/docker.sock'
    version: '1.14'
    timeout: 10
    quiet: false
    nocache: false
    rm: false
    stream: false

This is the configuration for the docker client and for the build process as mentioned in

If no file was specified, some defaults will be assumed.


The Vagrantfile supplied (which I haven't finished yet.. will let you know once it's ready) will loadz a vbox machine, install docker and jocker on it, generate a docker image from a template and run a container based on the image in a daemonized mode to demonstrate the KRAZIE RAW POWER of jocker (and docker.. I guess wink)


Please do.