Deploying shouldn’t mean a maintenance window. With containers and a sensible orchestration setup, new code rolls out while the old version keeps serving — and traffic only shifts once the new one proves it’s healthy.
How the handover works
A readiness probe tells the load balancer when a container is actually ready, not just running. Rolling updates replace instances a few at a time. Graceful shutdown lets in-flight requests finish before an old container exits. Get those three right and deploys become invisible to users.
The payoff is cultural as much as technical: when deploys are safe, teams deploy small changes often — which is exactly what keeps risk low.
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