Problem scenario
You want to deploy Flask to test it out. You also want a RESTful endpoint on an Ubuntu Linux server. How do you do this?
Solution
1. Install Flask. Run these five commands:
sudo apt-get -y update
sudo apt-get -y install python python-pip
sudo pip install --upgrade pip setuptools
sudo apt-get -y install python3-dev virtualenv python3-venv
pip install flask
2. Make a directory and create a basic Python program to test it out. To do these things follow these steps:
mkdir contintflask
vi __init__.py # Place the code below inside this __init__.py file:
from flask import Flask, Response
app = Flask(__name__)
@app.route("/")
def index():
return Response("It works! Continually Integrate and Improve!"), 200
if __name__ == "__main__":
app.run(debug=True)
# Most of this code was taken from https://www.fullstackpython.com/blog/python-3-flask-green-unicorn-ubuntu-1604-xenial-xerus.html
3. From another terminal (e.g., open another command prompt from your desktop or create a duplicate Putty session to the server), run this command:
curl http://localhost:5000
Look at the output on the first terminal. You should see an HTTP status code of 200 and other information.