Application node runs on Flask Python

1. Lauch a instance with Ubuntu OS

2. In the launched instance, execute the following commands :

    apt-get update -y
    apt-get upgrade -y
   

3. I have used python flask application on the two applicaton nodes. To install flask application, following commands need to be executed :

    apt-get install python-setuptools
    easy_install pip
    pip install flask
   

4. By default, python flask application runs on port 5000. In order to modify the listening port to 8484 [as per guidelines], I have modified the hello.py with the following code :

    from flask import Flask
    import os
    app = Flask(__name__)
    @app.route("/")
    def hello():
        return "Hi there, I'm served from ip-172-31-64-60!"
    app.debug = True
    if __name__ == '__main__':
        port = int(os.environ.get('PORT', 8484))
   
        if port == 8484:
           app.debug = True
   
        app.run(host='0.0.0.0', port=8484)
   

I have verified that security group is modified in such a way that traffic is allowed to access application in web-browser 5. Run the following command to start the flask applicaiton.

 python hello.py
 
Sample output :
* Running on http://0.0.0.0:8484/ (Press CTRL+C to quit)
* Restarting with stat
* Debugger is active!
* Debugger PIN: 302-961-758

6. Screenshots of the running flask application uploaded with the names app_1.png, app_2.png. Please check.

7. Repeated the same by creating instance Store-Backed Linux AMI for the application node 2

Wed node runs on nginx

1. Launched Ubuntu instance with prerequisites commands of update, upgrade

2. Installed nginx using the following commands :

   apt-get install nginx
   

3. Configured nginx service for balancing the requests in round robin fashion between two application nodes.

   Edited the file /etc/nginx/sites-available/default with the following contents :
   
   upstream nginxtest {
   server <Public_IPaddress>:8484;
   server <Public_IPaddress>:8484;
   }
   
   server {
   listen 80;
   server_name <server_IPaddress>;
   
   location / {
   proxy_pass http://nginxtest/;
   }
   }
   
   

4. Nginx Service restarted and the results are uploaded as screenshots nginx_1.png, nginx_2.png