# Blue-Green Deployment

> Maintain two identical environments for safe deployments

- **Category**: Cloud
- **Subcategory**: gcp
- **Canonical URL**: https://designpattern.fyi/patterns/gcp_blue_green_deployment/

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## Description
The Blue-Green Deployment pattern maintains two identical production environments, with only one serving live traffic at a time. New versions are deployed to the inactive environment, tested, and then traffic is switched. This provides instant rollback capability by switching traffic back to the previous version.


## Use Cases
Use when you need instant rollback capability or when you want to eliminate downtime during deployments.





## Trade-offs


### Advantages

- Instant rollback capability

- Zero-downtime deployments

- Safe testing before traffic switch

- Clear separation of versions




### Considerations & Drawbacks

- Doubled infrastructure costs

- More complex deployment process

- Requires traffic switching mechanism







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**Reference**: [Original Source](https://cloud.google.com/architecture/hybrid-multicloud-patterns-and-practices)