Recreate vs Rolling Update
Compare all-at-once application replacement with gradual controlled rollout during deployment.
CI/CD
Recreate
Recreate is a deployment strategy where old application instances are stopped before new ones are started. It is simple, but may introduce downtime.
CI/CD
Rolling Update
Rolling Update is a deployment strategy where old instances are replaced gradually by new ones. It reduces disruption and is the default strategy for many stateless applications.
Key Differences
Recreate stops old pods first and then starts new ones, while Rolling Update replaces pods gradually over time.
Recreate is simpler and avoids mixed-version overlap, while Rolling Update improves availability during deployment.
Rolling Update is usually preferred for stateless applications because it reduces downtime and deployment risk.
Recreate may be necessary when old and new versions cannot safely run together.
Rolling Update allows observation of rollout health during transition, while Recreate is more of a hard cutover.
The right strategy depends on compatibility, downtime tolerance, and the application’s behavior during version transitions.
When to Use
When to use Recreate
Use Recreate when old and new versions cannot safely coexist, when the application requires a hard cutover, or when brief downtime is acceptable.
When to use Rolling Update
Use Rolling Update when you want gradual deployment, lower risk, better availability, and controlled release behavior for stateless services.
Tradeoffs
Recreate is operationally simpler, but may cause downtime and abrupt cutovers.
Rolling Update improves continuity and safety, but may require stronger compatibility between versions.
Rolling Update is usually the better default, but Recreate is valuable when overlap is unsafe.
Common Mistakes
Using Recreate for normal stateless applications that could be rolled safely.
Using Rolling Update when versions are incompatible and cannot run side by side.
Ignoring how deployment strategy impacts user traffic, availability, and rollback behavior.
Interview Tip
Strong short answer: Recreate is a full replacement with possible downtime. Rolling Update is a gradual rollout with better availability.