Zero-downtime deploys on Azure Container Apps

Zero-downtime deploys on Azure Container Apps combine immutable revisions, reliable health probes, and progressive traffic routing.

Revisions and traffic

Each deploy creates a new revision. Until it passes probes, traffic stays on the stable revision. Only then do you shift weight (10% → 50% → 100%) or swap instantly.

• —Liveness probes — process is alive.
• —Readiness probes — app ready for requests.
• —Startup probe — extra time for cold start.

Practical checklist

Before promoting traffic, confirm logs, metrics, and rollback: keeping the previous revision active makes rollback a weight change—not an emergency redeploy.