Three-Tier Architecture using Docker

Overview

This project demonstrates a three-tier architecture using Docker containers for a frontend, backend, and database setup. The setup involves:

• Database: MySQL
• Backend: Java (Spring Boot or Servlet-based)
• Frontend: HTML, CSS, JavaScript

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Prerequisites

Ensure you have the following installed:

• Docker
• Git

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Project Setup Steps

Step 1: Clone the Repository

sudo yum install git -y
git clone https://github.com/abhipraydhoble/ThreeTier-Using-Docker.git
cd ThreeTier-Using-Docker

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Step 2: Set Up the Database

Navigate to the database directory:

cd database

The SQL script creates a studentapp database and a students table with student details.

• The Dockerfile:
• Uses the MariaDB base image.
• Sets the root password (1234).
• Copies student-rds.sql into the container for automatic database initialization.
• Starts the MariaDB service (mariadbd).

2.1 Build the MySQL Docker Image

docker build -t my-mysql-db .

2.2 Run the MySQL Container

docker run -d --name my-mysql-container -p 3306:3306 my-mysql-db

2.3 Get the MySQL Container IP

docker inspect my-mysql-container

Copy this IP address for the next step.

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Step 3: Configure and Run the Backend

Navigate to the backend directory:

cd ../backend

3.1 Update the context.xml File

Edit context.xml and replace <MYSQL_CONTAINER_IP> with the actual MySQL container IP from Step 2.3:

<Context>
    <Resource name="jdbc/StudentDB" auth="Container"
        type="javax.sql.DataSource" driverClassName="com.mysql.cj.jdbc.Driver"
        url="jdbc:mysql://<MYSQL_CONTAINER_IP>:3306/studentdb"
        username="root" password="root" maxTotal="10" maxIdle="5"/>
</Context>

3.2 Build the Backend Image

docker build -t my-backend-app .

3.3 Run the Backend Container

docker run -d --name my-backend-container -p 8080:8080 my-backend-app

3.4 Verify Backend

Check if the backend is working:

curl http://<INSTANCE_PUBLIC_IP>:8080/student

Replace <INSTANCE_PUBLIC_IP> with your server's public IP.

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Step 4: Configure and Run the Frontend

Navigate to the frontend directory:

cd ../frontend

4.1 Update the index.html File in Frontend Directory

Edit index.html and replace the backend URL:

<a href="http://54.169.189.50:8080/student/">Register Here</a>

Replace <INSTANCE_PUBLIC_IP> with your actual server's public IP.

4.2 Build the Frontend Image

docker build -t my-frontend-app .

4.3 Run the Frontend Container

docker run -d --name my-frontend-container -p 80:80 my-frontend-app

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Step 5: Access the Final Application

Now, open your browser and go to:

http://<INSTANCE_PUBLIC_IP>

You should see the final application running!

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Troubleshooting

• Check running containers: docker ps
• View logs: docker logs my-backend-container
• Stop all containers: docker stop my-mysql-container my-backend-container my-frontend-container
• Remove all containers: docker rm my-mysql-container my-backend-container my-frontend-container

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