Rolling vs Blue-Green Deployment
Incremental in-place replacement versus full environment swap for production releases.
Overview
What is being compared
Both are ways to release a new version to production. A rolling deployment replaces instances one by one, or in small batches, and keeps service capacity throughout. Blue-green keeps a complete parallel environment and switches traffic atomically.
- How it updates — Replaces instances in place, one or a batch at a time — Builds a full parallel environment, then switches
- Extra capacity — Surge instances only, for a short time — 100% of production capacity in parallel
- Mixed versions — Old and new serve together for the whole rollout — None after the switch
- Rollback — Re-roll every instance, as long as the deploy itself — Instant, at the load balancer
- Kubernetes support — Default Deployment strategy — Needs Argo Rollouts, Flagger or manual label changes
- Overall — Simpler and cheaper — Instant rollback, clean cutover
> [!WARNING] The mixed-version window means a rolling deploy is unsafe for a change that breaks API or schema compatibility.
A blue-green release, state by state
> [!TIP] Both strategies side by side, a safe Kubernetes rolling update and the choice between them play step by step in Visual Explanation below.
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