Deploying 2-Tier Flask App on Docker Container

This is the simple flask-app that connect with MYSQL database.

This app allows user to send messages and store them in MYSQL Database and shows that messages on front-end.

Prerequisites

• Basic understanding of Flask and MySQL.

• Docker installed on your system.

• Docker Compose

• Git and Github

• AWS (Optional)

Steps

1) Cloning the repository to your local machine or AWS EC2 (Docker Installed)

 git clone https://github.com/Mihir-Kumar13/two-tier-flask-app.git

2) Navigate to the repository and Create a .env file in the same directory to store MYSQL environment variables:

cd flaskapp
toucn .env   ## For storing the enivronment variables

3) Adding the MYSQL configuration in .env file

MYSQL_HOST=mysql
MYSQL_USER=your_username
MYSQL_PASSWORD=your_password
MYSQL_DB=your_database

To Run the containers without docker compose

1) First create a docker image called flaskapp

   docker build -t flaskapp .

1) Creating docker network

   docker network create twotier  # Creating docker network

2) Running both the containers

i) MYSQL Container

docker run -d \
    --name mysql \
    -v mysql-data:/var/lib/mysql \
    --network=twotier \
    -e MYSQL_DATABASE=mydb \
    -e MYSQL_ROOT_PASSWORD=admin \
    -p 3306:3306 \
    mysql:5.7

ii) Backend Container

docker run -d \
    --name flaskapp \
    --network=twotier \
    -e MYSQL_HOST=mysql \
    -e MYSQL_USER=root \
    -e MYSQL_PASSWORD=admin \
    -e MYSQL_DB=mydb \
    -p 5000:5000 \
    flaskapp:latest

Docker compose

1) Start the containers using Docker compose

  docker-compose up --build

2) Access the Flask app in your web browser:

• Frontend: http://localhost

• Backend: http://localhost:5000

3) Create the messages table in your MySQL database:

CREATE TABLE messages (
    id INT AUTO_INCREMENT PRIMARY KEY,
    message TEXT
);

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#DevOps #Jenkins #Flask #Python #automation #Docker #deployment #MySQL