Building a python web app

The goal of this example is to show you how you can author your own docker images using a parent image, making changes to it, and then saving the results as a new image. We will do that by making a simple hello flask web application image.

Steps:

docker pull shykes/pybuilder

We are downloading the "shykes/pybuilder" docker image

URL=http://github.com/shykes/helloflask/archive/master.tar.gz

We set a URL variable that points to a tarball of a simple helloflask web app

BUILD_JOB=$(docker run -d -t shykes/pybuilder:latest /usr/local/bin/buildapp $URL)

Inside of the "shykes/pybuilder" image there is a command called buildapp, we are running that command and passing the $URL variable from step 2 to it, and running the whole thing inside of a new container. BUILD_JOB will be set with the new container_id.

docker attach $BUILD_JOB
[...]

We attach to the new container to see what is going on. Ctrl-C to disconnect

BUILD_IMG=$(docker commit $BUILD_JOB _/builds/github.com/hykes/helloflask/master)

Save the changed we just made in the container to a new image called "_/builds/github.com/hykes/helloflask/master" and save the image id in the BUILD_IMG variable name.

WEB_WORKER=$(docker run -d -p 5000 $BUILD_IMG /usr/local/bin/runapp)

Use the new image we just created and create a new container with network port 5000, and return the container id and store in the WEB_WORKER variable.

docker logs $WEB_WORKER
 * Running on http://0.0.0.0:5000/

view the logs for the new container using the WEB_WORKER variable, and if everything worked as planned you should see the line "Running on http://0.0.0.0:5000/" in the log output.

Video:

See the example in action

Continue to running_ssh_service.

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Building a python web app

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