GitOps with ArgoCD in Kubernetes - Mini Project: Build & Apply

GitOps with ArgoCD

📖 Scenario: You are working as a DevOps engineer for a small company. Your team wants to use GitOps to manage Kubernetes applications. You will use ArgoCD to automatically deploy an application from a Git repository to a Kubernetes cluster.

🎯 Goal: Learn how to set up a basic ArgoCD Application resource that points to a Git repository and deploys an app to Kubernetes automatically.

📋 What You'll Learn

Create a Kubernetes namespace for ArgoCD

Create an ArgoCD Application resource with correct Git repo URL and path

Set the target cluster and namespace for deployment

Verify the application sync status with ArgoCD

💡 Why This Matters

🌍 Real World

GitOps with ArgoCD is used in real companies to automate Kubernetes app deployments from Git repositories, making deployments reliable and repeatable.

💼 Career

Knowing how to use ArgoCD for GitOps is a valuable skill for DevOps engineers and site reliability engineers working with Kubernetes.

1

Create the ArgoCD namespace

Create a Kubernetes namespace called argocd using the command kubectl create namespace argocd.

Kubernetes

# Create the argocd namespace
# Your code here

Need a hint?

Use kubectl create namespace argocd to create the namespace.

2

Define the ArgoCD Application manifest

Create a YAML manifest file called app.yaml that defines an ArgoCD Application resource with these exact values: apiVersion: argoproj.io/v1alpha1, kind: Application, metadata.name: guestbook, spec.source.repoURL: https://github.com/argoproj/argocd-example-apps.git, spec.source.path: guestbook, spec.destination.server: https://kubernetes.default.svc, and spec.destination.namespace: default.

Kubernetes

# Write the ArgoCD Application YAML manifest in app.yaml
# Your code here

Need a hint?

Make sure to include metadata.name as guestbook and set the spec.source.repoURL and spec.source.path exactly as given.

3

Apply the ArgoCD Application manifest

Use the command kubectl apply -f app.yaml -n argocd to create the ArgoCD Application resource in the argocd namespace.

Kubernetes

apiVersion: argoproj.io/v1alpha1
kind: Application
metadata:
  name: guestbook
  namespace: argocd
spec:
  source:
    repoURL: https://github.com/argoproj/argocd-example-apps.git
    path: guestbook
  destination:
    server: https://kubernetes.default.svc
    namespace: default
  project: default

# Apply the ArgoCD Application manifest
# Your code here

Need a hint?

Use kubectl apply -f app.yaml -n argocd to create the Application resource.

4

Check the ArgoCD Application sync status

Run the command kubectl get applications -n argocd guestbook -o jsonpath='{.status.sync.status}' to display the sync status of the guestbook application.

Kubernetes

apiVersion: argoproj.io/v1alpha1
kind: Application
metadata:
  name: guestbook
  namespace: argocd
spec:
  source:
    repoURL: https://github.com/argoproj/argocd-example-apps.git
    path: guestbook
  destination:
    server: https://kubernetes.default.svc
    namespace: default
  project: default

kubectl apply -f app.yaml -n argocd

# Check the sync status of the guestbook application
# Your code here

Need a hint?

The output should be Synced when the application is deployed successfully.