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Lesson 7 of 8ā¢40 min
Progressive Delivery with Argo Rollouts (Canary & Blue-Green)
Standard Kubernetes Deployment rolling updates have a critical flaw: they only verify that a container starts and passes readiness probes. They cannot verify if the new version is throwing 500 errors to real users.
If version v2.0.0 has a severe bug that crashes after 30 seconds of user traffic, standard Kubernetes will happily roll it out to 100% of your users.
Argo Rollouts brings advanced Canary and Blue-Green deployment strategies with automated metric-driven rollbacks to Kubernetes.
100%
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1. The Rollout CRD vs Standard Deployment
To use Argo Rollouts, simply change apiVersion: apps/v1 & kind: Deployment to argoproj.io/v1alpha1 & kind: Rollout:
yaml
apiVersion: argoproj.io/v1alpha1
kind: Rollout
metadata:
name: production-web-api
namespace: production
spec:
replicas: 5
strategy:
canary:
# Step-by-step traffic shifting
steps:
# Step 1: Send 20% of traffic to the new version
- setWeight: 20
# Step 2: Pause for 10 minutes to collect real telemetry
- pause: { duration: 10m }
# Step 3: Run automated Prometheus health analysis
- analysis:
templates:
- templateName: success-rate-check
# Step 4: Increase to 50%
- setWeight: 50
- pause: { duration: 10m }
# Step 5: Complete rollout to 100%
2. Automated Metric Analysis with AnalysisTemplate
An AnalysisTemplate queries your live Prometheus server during the canary phase. If the error rate exceeds your threshold, Argo Rollouts instantly aborts the deployment and shifts 100% of traffic back to the stable version: