Added ai app and simple webapp

Author: kchandan

project-ai-app/README.md

@@ -0,0 +1,74 @@
+
+## Install Ollama on Linux
+
+```
+docker run -d -v ollama:/root/.ollama -p 11434:11434 --name ollama ollama/ollama
+```
+
+```
+Unable to find image 'ollama/ollama:latest' locally
+latest: Pulling from ollama/ollama
+6414378b6477: Pull complete
+9423a26b200c: Pull complete
+629da9618c4f: Pull complete
+00b71e3f044c: Pull complete
+Digest: sha256:18bfb1d605604fd53dcad20d0556df4c781e560ebebcd923454d627c994a0e37
+Status: Downloaded newer image for ollama/ollama:latest
+2352d454e7117a79459cd7d1413e686680a80927494ff6dbd70faebd3dcfabb0
+```
+
+## Pull Llama 3.2:1b Model
+
+```
+curl http://localhost:11434/api/pull -d '{
+  "model": "llama3.2:1b"
+}'
+```
+
+```
+docker exec -it ollama ollama ls
+```
+
+## Test if the model is serving
+
+```
+curl http://localhost:11434/api/chat -d '{
+  "model": "llama3.2:1b",
+  "messages": [
+    {
+      "role": "user",
+      "content": "Where is Paris"
+    }
+  ],
+  "stream": false
+}'
+```
+
+```
+docker exec -it ollama ollama ps
+NAME           ID              SIZE      PROCESSOR    UNTIL
+llama3.2:1b    baf6a787fdff    2.2 GB    100% CPU     4 minutes from now
+```
+
+
+## Clone the AI Application
+
+Fork the Github Repo - https://github.com/db-agent/db-agent
+
+```
+git clone https://github.com/db-agent/db-agent.git
+
+```
+
+## Build and deploy the App
+
+```
+cd db-agent
+docker compose -f docker-compose.local.yml build
+docker compose -f docker-compose.local.yml up -d
+# Check logs
+docker compose -f docker-compose.local.yml logs -f
+
+
+```
+

project-simple-webapp/README.mp

@@ -0,0 +1,48 @@
+# Assignment: Building a 3-Tier Application Using Docker Compose
+
+## Objective
+This assignment will guide you through designing and deploying a 3-tier application architecture using **Docker Compose**. The 3-tier architecture includes a web server (frontend), an application server (backend), and a database server (DB). Each tier is containerized and orchestrated using Docker Compose.
+
+---
+
+## Application Overview
+
+You will create a simple web application with the following components:
+
+1. **Web Server (Frontend)**: A **Nginx** server to serve static content and act as a reverse proxy for the application server.
+2. **Application Server (Backend)**: A Python Flask application that handles business logic and interacts with the database.
+3. **Database Server**: A **PostgreSQL** database to store application data.
+
+---
+
+## Tasks
+
+### 1. Database Server
+- Use PostgreSQL as the database.
+- Initialize the database with a schema and some sample data.
+- Expose the necessary port to allow the application server to connect.
+
+### 2. Application Server
+- Create a Flask application that:
+  - Connects to the database to fetch and store data.
+  - Exposes RESTful APIs for the web server to consume.
+- Use environment variables to configure database credentials.
+
+### 3. Web Server
+- Use Nginx to serve static files.
+- Configure Nginx as a reverse proxy to forward API requests to the application server.
+
+### 4. Docker Compose
+- Define all three services (`web`, `app`, `db`) in a `docker-compose.yml` file.
+- Set up networking to allow communication between the services.
+- Use Docker volumes for persistent data storage.
+
+
+---
+
+## Deliverables
+1. A `docker-compose.yml` file to orchestrate the services.
+2. Configuration files for the database, application, and web server.
+3. A fully functional 3-tier application accessible from the browser.
+4. A `README.md` with clear setup and deployment instructions.
+

project-simple-webapp/app/app.py

@@ -0,0 +1,17 @@
+from flask import Flask, jsonify
+from sqlalchemy import create_engine, text
+
+app = Flask(__name__)
+
+DATABASE_URL = "postgresql://user:password@db:5432/mydb"
+engine = create_engine(DATABASE_URL)
+
+@app.route('/api/users', methods=['GET'])
+def get_users():
+    with engine.connect() as connection:
+        result = connection.execute(text("SELECT * FROM users"))
+        users = [dict(row._mapping) for row in result]
+    return jsonify(users)
+
+if __name__ == "__main__":
+    app.run(host="0.0.0.0", port=5000)

project-simple-webapp/app/requirements.txt

@@ -0,0 +1,3 @@
+flask
+sqlalchemy
+psycopg2-binary

project-simple-webapp/db/init.sql

@@ -0,0 +1,9 @@
+CREATE TABLE users (
+    id SERIAL PRIMARY KEY,
+    name VARCHAR(100),
+    email VARCHAR(100) UNIQUE
+);
+
+INSERT INTO users (name, email) VALUES
+('Alice', 'alice@example.com'),
+('Bob', 'bob@example.com');

project-simple-webapp/web/nginx.conf

@@ -0,0 +1,7 @@
+server {
+    listen 80;
+
+    location / {
+        proxy_pass http://app:5000;
+    }
+}