Deploy simple server using Flask on AWS

Question

I'm using this Python code to see if I can view the simple AWS server however, I'm still not able to load the webpage properly.

from flask import Flask

app = Flask(__name__)

@app.route('/')
def index():
    return "It works!"

if __name__ == '__main__':
    app.run(port=80, host='0.0.0.0')

In AWS, inbound:

HTTP TCP port 80 with a source of: 0.0.0.0/0
SSH TCP port 22 with a source of: 0.0.0.0/0

Outbound - everything is allowed.

I'm seeing no errors on terminal when I start the program. The console says Running on http://127.0.0.1:5000/ (Press CTRL+C to quit) so I'm trying to load http://ubuntu@ec2-IPADDRESS.compute-1.amazonaws.com:5000

Answer 1

Flask defaults to binding to 127.0.0.1:5000 .

If you're trying to access http://ubuntu@ec2-IPADDRESS.compute-1.amazonaws.com:5000 , you'll need to have port 5000 opened in the inbound firewall rules and bind to 0.0.0.0 instead of 127.0.0.1.

Answer 2

You can not use port 80 for your web application. Let it run on default port then host your web application by mod_wsgi or uWSGI... Check the deployment options here: http://flask.pocoo.org/docs/0.12/deploying/ .

Imo: better if you deploy your application on AWS Elastic Beanstalk. Give me a shout if you need a sample project.