PROFESSIONAL-CLOUD-DEVOPS-ENGINEER Question #126: Real Exam Question with Answer & Explanation

Question

You deploy a new release of an internal application during a weekend maintenance window when there is minimal user tragic. After the window ends, you learn that one of the new features isn't working as expected in the production environment. After an extended outage, you roll back the new release and deploy a fix. You want to modify your release process to reduce the mean time to recovery so you can avoid extended outages in the future. What should you do? (Choose two.)

Options

• ABefore merging new code, require 2 different peers to review the code changes.
• BAdopt the blue/green deployment strategy when releasing new code via a CD server.
• CIntegrate a code linting tool to validate coding standards before any code is accepted into the
• DRequire developers to run automated integration tests on their local development environments
• EConfigure a CI server. Add a suite of unit tests to your code and have your CI server run them on

Explanation

To reduce Mean Time To Recovery (MTTR) for application releases, implement a blue/green deployment strategy and integrate automated unit tests via a CI server.

Common mistakes.

• A. Requiring peer reviews improves code quality and reduces defects, but it's a preventative measure that doesn't directly reduce recovery time once an issue is in production.
• C. Integrating a code linting tool improves code style and identifies potential issues, but it's primarily a preventative measure for code quality and doesn't directly impact the time it takes to recover from a production incident.
• D. While important, requiring developers to run integration tests locally is a manual step that depends on individual adherence and doesn't guarantee automated issue detection or faster recovery in production.

Concept tested. Release Strategies (Blue/Green) & CI/CD for MTTR

Reference. https://cloud.google.com/solutions/architecture/blue-green-deployments; https://cloud.google.com/architecture/ci-cd-on-gcp

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