Which software deployment model utilizes two identical configurations for production?

The blue-green deployment model is characterized by having two identical environments, typically referred to as the "blue" and "green" environments. In this model, one environment is live and serving production traffic, while the other one is on standby and configured to take over seamlessly when updates or changes are ready to be deployed. This approach allows for a controlled switch between the two environments, ensuring that if the new version deployed in the inactive environment has issues, it can be easily reverted to the stable version running in the active environment.

Using blue-green deployment helps minimize downtime and risks associated with deploying new software versions, as the switch can be completed quickly without impacting the user experience. It facilitates testing and validations in the idle environment before directing traffic to it.

In contrast, other options do not share this identical configuration characteristic. The canary deployment model involves gradually rolling out changes to a small subset of users before a broader release, thereby allowing for performance monitoring for issues. The hybrid model combines different environments or cloud models (like public and private clouds) but does not specifically imply identical configurations. The distributed model refers to a system architecture where components are spread across multiple locations rather than focusing on deployment configurations.