python - How to deploy structured Flask app on AWS elastic beanstalk

Question

After successfully deploying a test app using the steps outlined here: http://docs.aws.amazon.com/elasticbeanstalk/latest/dg/create_deploy_Python_flask.html

I tried to deploy my actual flask application which has the following structure:

myApp/
   runServer.py
   requirements.txt
   myApp/
      __init__.py
      helpers.py
      clean.sh
      static/
         myApp.css
      handlers/
         __init__.py
         views.py
      templates/
         layout.html
         viewOne.html
         viewTwo.html

Where views.py contains my url mappings.

I have tried initializing the eb instance in the root directory as well as within the myApp module and git aws.push but I get the following error on the AWS dashboard: ERROR Your WSGIPath refers to a file that does not exist. and the application does not work (404 for any path).

How can I deploy the above Flask application to elastic beanstalk?

Answer 1

I encountered a similar problem deploying a Flask application to EB, with a similar directory structure, and had to do 2 things:

1. Update my manage.py to create an object of name application, not app

   import os
   from application import create_app, db
   from flask.ext.script import Manager, Shell
   
   application = create_app(os.getenv('FLASK_CONFIG') or 'default')
   manager = Manager(application)
   

2. Create .ebextensions/myapp.config, and define the following block to point to manage.py

   option_settings:
     "aws:elasticbeanstalk:container:python":
       WSGIPath: manage.py
     "aws:elasticbeanstalk:container:python:staticfiles":
       "/static/": "application/static/" 
   

This let Elastic Beanstalk find the application callable correctly.

This is described briefly at the official docs, and is described in more detail in this blog post

EDIT - see project structure below

• ProjectRoot
  • .ebextensions
    • application.config
  • application
    • main
      • forms.py
      • views.py
  • static
  • templates
  • tests
  • manage.py
  • requirements.txt
  • config.py
  • etc, etc