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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