Hybrid Cloud Multi-Cluster Kubernetes Infrastructure

Project Overview

This project demonstrates a robust, production-grade Hybrid Cloud Multi-Cluster Kubernetes Infrastructure designed for scalability, high performance, and high availability. It integrates advanced cloud-native technologies to manage, monitor, and deploy applications seamlessly across multiple workload clusters from a centralized management plane.

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System Architecture

Multi-cluster Infrastructure Architecture

Figure 1: Kubernetes multi-cluster architecture overview

Multi-cluster GitOps Pipeline

Figure 2: Multi-cluster GitOps deployment pipeline

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Core Components

• Karmada: Orchestrates multi-cluster application distribution and management.
• Cilium CNI: High-performance networking and security with eBPF technology.
• GitOps (FluxCD & ArgoCD): Automated synchronization of Helm charts and K8s manifests.
• Observability Stack: Centralized monitoring with Thanos, Prometheus, and Grafana for global visibility.
• Infrastructure Components: Lightweight clusters using Kind and K3s, with HAProxy for load balancing.

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Laboratory Guide

This repository contains a comprehensive 15-lab series covering the entire setup process:

1. Lab 01: Cilium Setup
2. Lab 02: Cilium Gateway API
3. Lab 03: Simple App Deployment
4. Lab 04: Hubble Observability
5. Lab 05: Prometheus and Grafana
6. Lab 06: Cluster Mesh
7. Lab 07: Multi-cluster Setup
8. Lab 08: Karmada Setup
9. Lab 09: Simple App Propagating
10. Lab 10: HAProxy Setup
11. Lab 11: Multi-cluster Failover
12. Lab 12: Network Policy
13. Lab 13: Multi-cluster Monitoring
14. Lab 14: Alert Manager
15. Lab 15: GitOps (ArgoCD/FluxCD)

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Related Repositories

• k8s-multicluster-gitops: GitOps Manifests and Helm Charts used for automated deployment in this infrastructure.