Simple Web Application

This is a simple web application using Python Flask and MySQL database. This is used in the demonstration of development of Ansible Playbooks.

Below are the steps required to get this working on a base linux system.

• Install all required dependencies
• Install and Configure Database
• Start Database Service
• Install and Configure Web Server
• Start Web Server

1. Install all required dependencies

Python and its dependencies

apt-get install -y python python-setuptools python-dev build-essential python-pip python-mysqldb

2. Install and Configure Database

Install MySQL database

apt-get install -y mysql-server mysql-client

3. Start Database Service

• Start the database service

  service mysql start

• Create database and database users

  # mysql -u <username> -p
  
  mysql> CREATE DATABASE employee_db;
  mysql> GRANT ALL ON *.* to db_user@'%' IDENTIFIED BY 'Passw0rd';
  mysql> USE employee_db;
  mysql> CREATE TABLE employees (name VARCHAR(20));

• Insert some test data

  mysql> INSERT INTO employees VALUES ('JOHN');

4. Install and Configure Web Server

Install Python Flask dependency

pip install flask
pip install flask-mysql

• Copy app.py or download it from source repository
• Configure database credentials and parameters

5. Start Web Server

Start web server

FLASK_APP=app.py flask run --host=0.0.0.0

6. Test

Open a browser and go to URL

http://<IP>:5000                            => Welcome
http://<IP>:5000/how%20are%20you            => I am good, how about you?
http://<IP>:5000/read%20from%20database     => JOHN