Simple Flask Dockerizer

Settings to create a Docker image for a simple Flask project. This project has been created for a tutorial described on Kalimadev Blog.

Build Docker Container

docker build -t simple_flask .

The Docker file creates a container starting from Ubuntu 14.04:

FROM ubuntu:14.04

then it installs Python:

RUN apt-get install -y -q build-essential python-gdal python-simplejson
RUN apt-get install -y python python-pip wget
RUN apt-get install -y python-dev

and finally creates a virtual environment:

RUN pip install virtualenv

Required Python projects are installed through pip in the virtual environment straight from GitHub by setting the repositories URL in the requirements.txt file:

watchdog
Flask
flask-cors
https://github.com/Kalimaha/simple_flask/archive/master.zip
https://github.com/Kalimaha/simple_flask_blueprint/archive/master.zip

List Docker Images

docker images

REPOSITORY	TAG	IMAGE ID	CREATED	VIRTUAL SIZE
simple_flask	latest	b5dc209bf592	5 minutes ago	503 MB

Run Docker Container

docker run -it -p 5000:5000 simple_flask /deployment/env/bin/python /deployment/start.py

This command executes the simple Python script contained in the project to import the main Flask app and run it:

from simple_flask.rest import rest as rest_engine


rest_engine.run_engine('0.0.0.0')

The Flask host has been set to 0.0.0.0 in order to work with Docker.

Access the Application

The application is now up and running and it is possible to access it through the browser at:

http://localhost:5000/Kalimaha/

that shows:

Hello Kalimaha from CORE!

The app has a blueprint that can be accessed at:

http://localhost:5000/test/Kalimaha/

that shows:

Hello Kalimaha!

Developed with