Exam CAS-005 topic 1 question 91 discussion

Why the other options are less effective: B. Create a cron job to run apt-update every 30 days: This automates updates but doesn't address deployment speed or image consistency across services. C. Use snapshots to deploy code to existing compute instances: Snapshots can help with backup and rollback, but they don’t optimize for efficient, consistent updates across all services. D. Deploy a centralized update server: Useful in traditional IT environments, but not ideal for dynamic, containerized, or microservice architectures where immutable infrastructure (e.g., golden images) is preferred. So, option A aligns best with modern DevOps and microservices practices.

A. Use Terraform scripts while creating golden images. Explanation: In a microservice architecture where all services run on the same Linux platform, creating golden images (pre-configured, up-to-date machine or container images) can significantly reduce the overhead of updating the OS for every deployment. By automating the creation of these images using Terraform scripts (an Infrastructure as Code tool), the company ensures: OS and dependencies are consistently updated and secure. New microservices or updates can be deployed quickly using the latest base image. Infrastructure is reproducible, version-controlled, and scalable.