mmumshad / simple-webapp

Simple Web Application

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

simple-webapp's Issues

Error in App.py flask call

Change

from flask.ext.mysql import MySQL

to

from flaskext.mysql import MySQL

Python is now deprecated

Can the installation instructions be updated to Python3? When running the commands as is, the installation fails as Python2 has been deprecated.

Package python-dev is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
However the following packages replace it:
  python2-dev python2 python-dev-is-python3

Package python is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
However the following packages replace it:
  python2-minimal python2 dh-python 2to3 python-is-python3

Package python-mysqldb is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'python' has no installation candidate
E: Package 'python-dev' has no installation candidate
E: Package 'python-mysqldb' has no installation candidate