Argo CD Kubernetes GitOps Tutorial

This repository demonstrates how to deploy and manage a simple Grade Submission API on Kubernetes using Argo CD and GitOps principles, implemented through three approaches: a basic Kubernetes application, Kustomize, and a Helm chart.

Installation

Prerequisites

• kubectl
  https://kubernetes.io/docs/tasks/tools/

• Helm
  https://helm.sh/docs/intro/install/

• A GitHub account
  https://github.com/

Install Argo CD

helm repo add argo https://argoproj.github.io/argo-helm
helm repo update

kubectl create namespace argocd

helm install argocd argo/argo-cd --namespace argocd

Verify the installation:

kubectl get pods -n argocd

Usage

Access Argo CD

kubectl port-forward svc/argocd-server -n argocd 8080:443

Open in browser:

https://localhost:8080

Retrieve admin password:

kubectl -n argocd get secret argocd-initial-admin-secret \
  -o jsonpath="{.data.password}" | base64 -d

Login credentials:

• Username: admin
• Password: output of the above command

Grade Submission API

# Add a grade

curl -X POST http://localhost:32000/grades \
  -H "Content-Type: application/json" \
  -d '{"name": "Aarav", "subject": "Distributed Systems", "score": 91}'

# Add another grade

curl -X POST http://localhost:32000/grades \
  -H "Content-Type: application/json" \
  -d '{"name": "Meera", "subject": "Cloud Computing", "score": 88}'

# Retrieve all grades
curl http://localhost:32000/grades

API Reference

Method	Endpoint	Description
POST	/grades	Create a new grade
GET	/grades	Retrieve all grades