Argo Rollouts — Blue-Green Deployment

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Blue-green deployments are a critical strategy for minimizing downtime and risk during application updates. This approach involves running two identical production environments: one (blue) hosts the current version, while the other (green) deploys the new version. Traffic is gradually shifted from blue to green, allowing for seamless rollback if issues arise.

Argo Rollouts enhances Kubernetes deployments by automating blue-green and canary strategies, reducing manual intervention. Below, we explore how to implement this using Argo Rollouts.

You Should Know:

1. Install Argo Rollouts

First, deploy Argo Rollouts in your Kubernetes cluster:

kubectl create namespace argo-rollouts 
kubectl apply -n argo-rollouts -f https://github.com/argoproj/argo-rollouts/releases/latest/download/install.yaml

Verify installation:

kubectl get pods -n argo-rollouts

2. Define a Blue-Green Rollout

Create a Rollout manifest (`rollout.yaml`):

apiVersion: argoproj.io/v1alpha1 
kind: Rollout 
metadata: 
name: example-app 
spec: 
replicas: 3 
strategy: 
blueGreen: 
activeService: example-app-active 
previewService: example-app-preview 
autoPromotionEnabled: false 
selector: 
matchLabels: 
app: example-app 
template: 
metadata: 
labels: 
app: example-app 
spec: 
containers: 
- name: example-app 
image: your-app:v1 
ports: 
- containerPort: 8080

Apply it:

kubectl apply -f rollout.yaml

3. Deploy and Promote

Update the image to trigger a new deployment:

kubectl argo rollouts set image example-app example-app=your-app:v2

Monitor progress:

kubectl argo rollouts get rollout example-app --watch

Manually promote after testing:

kubectl argo rollouts promote example-app

4. Rollback if Needed

If issues occur, revert to the previous version:

kubectl argo rollouts undo example-app

5. Automate Promotion

To auto-promote after a delay, modify the Rollout:

blueGreen: 
autoPromotionSeconds: 30

6. Useful Commands

  • List all rollouts: 
    kubectl argo rollouts list rollouts
  • View rollout history: 
    kubectl argo rollouts history example-app
  • Abort a rollout: 
    kubectl argo rollouts abort example-app

What Undercode Say

Blue-green deployments with Argo Rollouts streamline Kubernetes updates, reducing risk and downtime. By automating traffic shifting and rollbacks, teams ensure smoother deployments. Key takeaways:
– Use `kubectl argo rollouts` for managing deployments.
– Monitor with `–watch` to track progress.
– Always test in the preview environment before promoting.
– Automate promotions cautiously to avoid premature releases.

For further reading, check the official Argo Rollouts documentation.

Expected Output:

A fully automated blue-green deployment process in Kubernetes with Argo Rollouts, ensuring zero-downtime updates and quick rollback capabilities.

References:

Reported By: Darryl Ruggles – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅

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