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ArgoCD and CI/CD pipelines for Kubernetes

ArgoCD is a continuous delivery tool for Kubernetes applications.

ArgoCD monitors your Git repo where the Kubernetes YAML manifests define, and sync your cluster according to those manifests. Your Git repo should always represent the desired application state, this pattern is known as GitOps, in which Git source of truth for your service defining.

  1. First, let's create a dedicated GitHub repository to store all Kubernetes YAML manifests. You can name it NetflixDevOps or NetflixInfra (short of Infrastructure). The repo file structure might be look like:

    NetflixInfra/
├── k8s/
│   ├── NetflixFrontend/
│   │   ├── deployment.yaml
│   │   ├── service.yaml
│   └── NetflixMovieCatalog/
│       ├── deployment.yaml
│       └── service.yaml

  2. Now, let's install ArgoCD in your Kubernetes cluster by:

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

  3. Visit the UI sever by:

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

    The username is admin, the initial password can be retrieved by:

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

  4. In the ArgoCD UI, after logging in, click the + New App button:

    • Give your app the name netflix-frontend, use the project default, and change the sync policy to Automatic.
    • Connect your NetflixInfra repo to Argo CD by setting repository url to the github repo url and set the path to k8s/NetflixFrontend/ (the path containing your YAML manifests for the frontend service):
    • For Destination, set cluster URL to https://kubernetes.default.svc namespace to default (the k8s namespace in which you'll deploy your services)
    • After filling out the information above, click Create.

  5. Repeat the above process for the NetflixMovieCatalog service.

  6. Test your app definition by updating one of your YAML manifests, commit and push it. Wait for Argo to automatically deploy your changes into the cluster.

Exercises

✏️ CI/CD pipeline for Kubernetes

Create a CI/CD pipeline for the NetflixFrontend service based on the below GitHub Actions workflow:

name: NetflixFrontend stack build-deploy

on:
  push:
    branches: 
     - main

permissions:
  contents: write

jobs:
  build:
    runs-on: ubuntu-latest

    steps:
      - uses: actions/checkout@v3
      - name: Buid and push docker images
        run: |
           # TODO build docker image
           
      - name: Checkout infrastructure repo
        uses: actions/checkout@v3
        with:
          repository: YOUR_NETFLIX_INFRA_REPO  # TODO change me
          token: ${{ secrets.REPO_TOKEN }}  # The GITHUB_TOKEN secret is a GitHub access token. 
          path: ./NetflixInfra

      - name: Update YAML manifests
        run: |
           cd ./NetflixInfra
           # TODO commit & push changes to infra repo
           
           
      - name: Commit and Push changes
        run: |
           cd ./NetflixInfra
           # TODO commit & push changes to infra repo