This is a simple web app made with Node.js and Express. It shows a picture of Gandalf and the current time in Colombo, Sri Lanka. It also tracks how many times each page is visited using Prometheus for monitoring. Everything is containerized using Docker and runs on a local Kubernetes setup.

• /gandalf – shows a picture of Gandalf and logs each visit.
• /colombo – shows the current time in Colombo and logs each visit.
• /metrics – shows Prometheus metrics so you can monitor usage.

Your computer runs:

• The app in a Docker container
• Prometheus in another container
• Kubernetes handles both of them
• Prometheus collects data from the app every 15 seconds

Port forwarding is used to access the app and Prometheus on your browser:

• App: http://localhost:8080
• Prometheus: http://localhost:9090

• Docker installed
• Kubernetes running (e.g. with Minikube or Docker Desktop)
• kubectl command line tool
• Windows (or you can adapt the script for other OS)

Just run:

restart.bat

This will:

• Build the Docker image
• Deploy everything to Kubernetes
• Start port forwarding

Build Docker image:

docker build -t gandalf-app .

Deploy to Kubernetes:

kubectl apply -f deployment.yaml
kubectl apply -f prometheus-config.yaml
kubectl apply -f prometheus-deployment.yaml

Forward ports:

kubectl port-forward svc/gandalf-service 8080:80
kubectl port-forward svc/prometheus-service 9090:9090

1. Go to http://localhost:9090

2. Try searching for:

   • gandalf_requests_total
   • colombo_requests_total

You’ll see how many times each route has been used.

.
├── app.js                   # Main app with routes
├── prometheus.js            # Sets up Prometheus counters
├── Dockerfile               # Builds the app image
├── package.json             # Lists app dependencies
├── deployment.yaml          # Deploys the app to Kubernetes
├── prometheus-config.yaml   # Prometheus scrape settings
├── prometheus-deployment.yaml # Deploys Prometheus to Kubernetes
├── restart.bat              # One-click setup script (Windows)
└── README.md                # This file

• You can add more routes by editing app.js.

• If Prometheus isn't showing metrics, check if the pods are running:

  kubectl get pods

• If port 80 is in use, change it in the files or run as a different port locally.

This project doesn't use any license.