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Dockerizing Flask application with CI/CD

Summary

The py-flask-ansible-docker repository is a project that demonstrates how to dockerize a Flask application, add nginx as a reverse proxy, and set up CI/CD pipelines using Ansible. The project has prerequisites such as Docker, Docker-compose, Ansible, Flask, and Virtualenv, and provides step-by-step instructions on how to build the application locally. The project uses Python for both frontend and backend and utilizes Ansible for infrastructure management. By adding nginx as a reverse proxy, the project ensures that the Flask application is accessible through a secure and scalable web server. The repository is useful for developers who want to learn how to containerize their Flask applications, add nginx as a reverse proxy, and automate their deployment using Ansible.

Prerequsite for local

  • Docker
  • Docker-compsoe
  • Ansible
  • Flask
  • Virtualenv

Build Application Locally

$ git clone https://github.com/RupGautam/py-flask-ansible-docker.git
$ cd py-flask-ansible-docker
# Create python venv
$ python3 -m venv env
# Activate venv
$ source env/bin/activate

Installing pip requirements

$ pip install pip --upgrade
$ pip install -r app/requirements.txt

Running the application locally

$ FLASK_APP=app.py
$ gunicorn -w 2 -b :8000 app:app

You should be able to access webpage localhost:8000

Build Application for Docker

# Make sure you have installed docker and docker-compose 
$ docker-compose up -d --build
or
$ docker build <image-name>:<v1> .
$ docker run -d -p 80:80 -p 8000:8000 <image-name>:<v1>

Deploying Application with Ansible

# Make sure you have install anisble and ansible-playbook
$ vi ansible/hosts
# Make necessary change for your inventories 
$ cd ansible
$ ansible-playbook site.yml

Once ansible-playbook is finished; you should be able to acess your application