Deploying hundreds of times a week without users ever noticing is a solved problem — if your Kubernetes setup is right. Here’s the exact approach we use for zero-downtime deployments in production.
Rolling updates with readiness probes
Kubernetes rolls out new pods gradually, but the magic is in readiness probes: a pod only receives traffic once it reports healthy. Combined with sensible maxSurge and maxUnavailable settings, old pods keep serving until the new ones are truly ready.
Graceful shutdown
On termination we catch SIGTERM, stop accepting new requests, finish in-flight ones, then exit — using a preStop hook and a termination grace period so no request is dropped mid-flight.
The full pipeline
- CI builds and tests every commit, then pushes an immutable image
- CD applies the new manifest and Kubernetes rolls it out
- Health checks gate the rollout; failures trigger an automatic rollback
- Database migrations are backward-compatible and decoupled from deploys
Safety nets
For risky changes we layer in canary or blue-green releases, plus monitoring and automated rollback on error-rate spikes. The result: confident, frequent releases with no downtime.
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