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Rolling deployment.

also: rolling deployments · rolling update · rolling updates · rolling deploy

Replacing old instances with new ones a few at a time, checking health before continuing, so there is no downtime.

the two-minute refresher

v1.0 → v1.1 one instance (or a few) at a time behind the load balancer.
Health checks gate each step.
Old and new versions run side by side during the rollout, so they must be compatible.
Rollback is another slow roll.

Where the course teaches it

W10 · Day 3Deployment Strategieslearn it →

Related concepts

Blue-green deployment
Canary deployment
Health check