What model utilizes two identical production environments for seamless updates?

The blue-green deployment model is characterized by having two identical production environments—often referred to as the "blue" environment and the "green" environment. This model allows for seamless updates and minimal downtime during deployment.

In a blue-green deployment, the blue environment represents the current production environment serving live traffic, while the green environment is the one where new code or updates are deployed and tested. Once the updates are successfully validated in the green environment, traffic is shifted to it, making it the new production environment. This strategy ensures that if any issues arise with the new deployment, it is easy to roll back to the blue environment, ensuring high availability and reliability of the application.

This approach significantly mitigates risks associated with deployments by allowing for a controlled method of switching between different environments. Additionally, the separation of environments means that testing and validation can occur without impacting the user experience in the current production environment.

The other options mentioned do not fit this specific model. Rolling deployments involve gradually updating instances without requiring two separate environments, while high availability clusters focus on minimizing downtime through redundancy rather than utilizing two parallel environments for updates. API-driven architecture is a design methodology focused on the way applications communicate and doesn’t specifically address deployment strategies.