CompTIA Cloud+ Practice Test

Which deployment model involves maintaining two identical production configurations?

1. Canary Deployment

2. Rolling Deployment

3. Blue-Green Model

4. Shadow Deployment

The correct answer is: Blue-Green Model

The blue-green model involves maintaining two identical production environments, often referred to as the "blue" and "green" environments. In this model, one environment serves live traffic while the other remains idle or is used for staging purposes. This setup allows for seamless switching between the two environments with minimal disruption, enabling testing of new features or updates in the idle environment before directing traffic to it. When a new version of the application is ready, it is deployed to the inactive environment, allowing for thorough testing. Once confirmed to be functioning correctly, traffic is redirected from the active environment to the newly updated one. This approach significantly reduces downtime and risk during deployments, as any issues can be quickly addressed by reverting traffic back to the previous environment. Other deployment strategies do not utilize this dual-environment approach. For example, a canary deployment involves releasing a new version to a small subset of users before rolling it out to the entire user base, which doesn’t require maintaining two identical configurations. Similarly, rolling deployments gradually replace instances of the current version with the new one across the infrastructure, rather than utilizing two distinct environments. Shadow deployments focus on running new versions alongside the current live version without impacting end users, which also doesn’t entail maintaining two identical sets of the production