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.
We set a URL variable that points to a tarball of a simple helloflask web app
..code-block:: bash
$ BUILD_JOB=$(docker run -t shykes/pybuilder:1d9aab3737242c65 /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. "1d9aab3737242c65" came from the output of step 1 when importing image. also available from 'docker images'.
..code-block:: bash
$ docker attach $BUILD_JOB
[...]
We attach to the new container to see what is going on. Ctrl-C to disconnect
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.
..code-block:: bash
$ WEB_WORKER=$(docker run -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.
..code-block:: bash
$ 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.
