🚀 Kubernetes GitOps and CI/CD

Kubernetes GitOps and CI/CD Implementation

Learn how to implement GitOps practices and establish robust CI/CD pipelines for your Kubernetes clusters using modern tools and techniques.

What We’ll Cover

1. GitOps Principles and Tools
2. ArgoCD Implementation
3. Flux CD Setup
4. CI/CD Pipeline Integration
5. Progressive Delivery Patterns

Prerequisites

• Kubernetes cluster
• Git repository access
• Basic CI/CD knowledge
• Helm fundamentals

Setting Up ArgoCD

First, let’s install ArgoCD:

kubectl create namespace argocd kubectl apply -n argocd -f https://raw.githubusercontent.com/argoproj/argo-cd/stable/manifests/install.yaml

ArgoCD Application Configuration

apiVersion: argoproj.io/v1alpha1 kind: Application metadata: name: myapp namespace: argocd spec: project: default source: repoURL: https://github.com/org/app.git targetRevision: HEAD path: k8s destination: server: https://kubernetes.default.svc namespace: myapp syncPolicy: automated: prune: true selfHeal: true

Implementing Flux CD

Installing Flux:

# Install Flux CLI brew install fluxcd/tap/flux # Bootstrap Flux flux bootstrap github \ --owner=my-github-username \ --repository=my-cluster-config \ --branch=main \ --path=clusters/my-cluster \ --personal

Flux Kustomization Example

apiVersion: kustomize.toolkit.fluxcd.io/v1beta2 kind: Kustomization metadata: name: apps namespace: flux-system spec: interval: 10m0s path: ./apps prune: true sourceRef: kind: GitRepository name: flux-system

CI Pipeline with GitHub Actions

name: CI on: push: branches: [ main ] pull_request: branches: [ main ] jobs: build: runs-on: ubuntu-latest steps: - uses: actions/checkout@v2 - name: Build and Test run: | make test make build - name: Build and Push Docker image uses: docker/build-push-action@v2 with: push: true tags: myorg/myapp:$

Progressive Delivery with Argo Rollouts

apiVersion: argoproj.io/v1alpha1 kind: Rollout metadata: name: myapp-rollout spec: replicas: 5 strategy: canary: steps: - setWeight: 20 - pause: {duration: 1h} - setWeight: 40 - pause: {duration: 1h} - setWeight: 60 - pause: {duration: 1h} - setWeight: 80 - pause: {duration: 1h} revisionHistoryLimit: 2 selector: matchLabels: app: myapp template: metadata: labels: app: myapp spec: containers: - name: myapp image: myorg/myapp:latest

GitOps Best Practices

1. Repository Structure:
   ├── base/ │ ├── deployment.yaml │ ├── service.yaml │ └── kustomization.yaml ├── overlays/ │ ├── production/ │ │ ├── kustomization.yaml │ │ └── patch.yaml │ └── staging/ │ ├── kustomization.yaml │ └── patch.yaml
2. Environment Management:
   • Use separate branches or directories
   • Implement environment-specific configurations
   • Maintain promotion strategy
3. Security Considerations:
   • Implement RBAC
   • Use sealed secrets
   • Regular security scanning

Video Resources

GitOps Fundamentals

• GitOps with ArgoCD by Viktor Farcic
• Flux CD Tutorial by TechWorld with Nana

CI/CD Implementation

• Kubernetes CI/CD with GitHub Actions by DevOps Toolkit
• ArgoCD Tutorial for Beginners by DevOps Journey

Advanced Patterns

• Progressive Delivery with Argo Rollouts by CNCF
• GitOps at Scale by Weaveworks

Additional Resources

• ArgoCD Documentation
• Flux Documentation
• GitOps Working Group
• Cloud Native CD Foundation