Prompt
Do I need Kubernetes for zero-downtime deployments?
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Oct 19, 2026
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No. Kubernetes is not required for zero-downtime deployments.
You can achieve zero-downtime deploys with many setups, for example:
- Load balancer + rolling replacement of instances
- Blue/green deployments
- Canary releases
- Process managers like systemd, PM2, or supervisord with careful handoff
- Container platforms other than Kubernetes
- PaaS services like Heroku, Render, Fly.io, ECS, Cloud Run, etc.
What matters is not Kubernetes itself, but having the right deployment pattern:
- run at least 2 instances of the app
- route traffic only to healthy instances
- use graceful shutdown so old instances stop accepting new requests before exiting
- handle database migrations in a backward-compatible way
- avoid breaking changes during deploys
Kubernetes can make this easier because it provides primitives like:
- readiness/liveness probes
- rolling updates
- service discovery
- autoscaling
- pod termination grace periods
But it also adds complexity. If your app is small or your infrastructure is simple, you can absolutely do zero-downtime deployments without Kubernetes.
If you want, I can outline the simplest zero-downtime setup for your environment, like:
- a single VM
- Docker Compose
- AWS ECS
- a classic load balancer setup
- Node/Python/Rails/etc.