DevOps Flashcards

What is the purpose of 'horizontal pod autoscaling' in Kubernetes?

Answer: Adding or removing pod replicas based on observed load

Horizontal pod autoscaling adjusts the number of pod replicas to match demand.

In trunk-based development, how are changes typically integrated?

Answer: Frequently merged into a single main branch in small increments

Trunk-based development emphasizes small, frequent merges into one main branch to reduce integration pain.

What is the main goal of a 'post-incident review' (postmortem)?

Answer: Learning from failures without blaming individuals to prevent recurrence

A blameless postmortem focuses on systemic learning to prevent the same incident from recurring.

Which tool is commonly used for collecting and querying time-series metrics?

Answer: Prometheus

Prometheus is a widely used open-source system for collecting and querying time-series metrics.

What does a 'rolling update' deployment do?

Answer: Gradually replaces old instances with new ones to avoid downtime

A rolling update incrementally replaces old pods with new ones to keep the service available.

In CI/CD, why is 'pipeline as code' preferred over manually configured jobs?

Answer: It is version controlled, reviewable, and reproducible

Defining pipelines as code makes them versioned, peer-reviewable, and reproducible across projects.

What is the function of a 'reverse proxy' in a typical deployment?

Answer: Routing client requests to backend services and load balancing

A reverse proxy forwards client requests to backend servers and often handles load balancing and TLS.