Kubernetes CGPA Calculator

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Technology Used 🌟

• Kubernetes (Container Orchestration)
• Docker 🐳 (Containerization)
• Travis CI 👷‍♂️ (Testing and Continuous Integration)
• React ⚛ (frontend)
• Node JS, Express (backend)
• Postgres (database) 🐘
• Redis (caching)

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Kubernetes Cluster Diagram

Explanation

Deployment	Description
Client	This is the front end of the app The client container has Nginx installed with the built react code Nginx serves the built react app from build folder
Server	Handles request to /api Backend of the application. Handles connection to Postgres and Redis Handles calculation logic
Postgres	Handles all the data of the application Uses a Persistent Volume Claim to persist data even if pod crashes
Redis	In Memory data store used as a cache Stores data as simple key value pairs

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Caching Mechanism

- Server gets data from the Redis server - If list is empty then server gets data from Postgres - This data is added to Redis

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Screenshots

1. Homepage - Enter name and semester. This gives you the list of subjects. Enter marks

2. List of names and CGPA. Caching Mechanism Applied here

3. Travis CI dashboard

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Install and run locally

Setup the Ingress Nginx Controller

kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/controller-v0.48.1/deploy/static/provider/cloud/deploy.yaml

Check the installation

kubectl get pods -n ingress-nginx

Create all the Kubernetes Objects

kubectl apply -f k8s/

If there is an error try deleting the server pod. An error may occur if the server pod is started before Redis and Postgres

kubectl delete pod <pod_name>

Check out the app on localhost:80