Microservices CI/CD and Deployment Strategies 2

Question 1

In a blue-green deployment, what is the role of the 'green' environment before the cutover?

Accepted Answer

The idle environment running the new version, validated before traffic switches

Answer

The live environment serving all production traffic

Answer

A backup database replica only

Answer

A staging environment that never receives real traffic

Question 2

What is the primary benefit of a canary release in a microservices system?

Accepted Answer

Exposing the new version to a small subset of users to limit blast radius

Answer

Deploying to every instance simultaneously for speed

Answer

Eliminating the need for monitoring

Answer

Avoiding any need to roll back

Question 3

Which practice best supports zero-downtime database schema changes during CI/CD?

Accepted Answer

Backward-compatible, expand-and-contract migrations

Answer

Dropping old columns immediately on deploy

Answer

Locking the entire table during peak hours

Answer

Renaming columns in a single irreversible step

Question 4

What does 'shift-left testing' mean in a CI/CD pipeline?

Accepted Answer

Running tests earlier in the development lifecycle

Answer

Moving deployment to the left server cluster

Answer

Delaying tests until production

Answer

Testing only after release

Question 5

Why are immutable container images preferred in deployment pipelines?

Accepted Answer

They guarantee the same artifact runs across all environments

Answer

They allow editing files live in production

Answer

They reduce the need for version tags

Answer

They automatically scale horizontally

Question 6

In a rolling deployment, what risk arises when old and new versions run simultaneously?

Accepted Answer

API or schema incompatibility between versions

Answer

Complete service outage by design

Answer

Inability to scale at all

Answer

Loss of all logging

Question 7

What is the main purpose of a deployment 'gate' in a pipeline?

Accepted Answer

To require automated or manual approval criteria before promotion

Answer

To compress build artifacts

Answer

To rotate secrets automatically

Answer

To merge feature branches