AWS DevOps Cost Optimization 2

Question 1

A DevOps team runs nightly integration tests on a fleet of EC2 instances that take 2 hours to complete. Which purchasing option minimizes cost for this predictable workload?

Accepted Answer

Spot Instances with a defined duration

Answer

Spot Instances with a defined duration (now called Spot blocks) are ideal for batch jobs with a known completion time, offering up to 70% savings over On-Demand.

Question 2

Which AWS CodePipeline configuration reduces cost when multiple source changes happen in quick succession?

Accepted Answer

Enable pipeline execution mode set to QUEUED

Answer

QUEUED execution mode causes CodePipeline to queue subsequent runs and deduplicate rapid changes, reducing unnecessary pipeline executions and associated costs.

Question 3

A team stores all CodeBuild build logs and artifacts indefinitely in S3. What is the most cost-effective way to manage this data over time?

Accepted Answer

Apply S3 Lifecycle policies to transition old artifacts to S3 Glacier and expire them after 90 days

Answer

S3 Lifecycle policies automate transitioning infrequently accessed artifacts to cheaper storage classes and deleting them after a retention period, directly reducing storage costs.

Question 4

Which strategy best reduces AWS CodeBuild costs for a project with many small, frequent builds?

Accepted Answer

Enable CodeBuild caching for dependencies and Docker layers

Answer

CodeBuild caching stores downloaded dependencies and Docker layers between builds, significantly reducing build duration and therefore billable build minutes.

Question 5

A company uses AWS Lambda in its CI/CD pipeline for custom approval logic. Lambda is invoked thousands of times per day. Which configuration change can reduce Lambda costs?

Accepted Answer

Right-size Lambda memory using AWS Lambda Power Tuning

Answer

AWS Lambda Power Tuning finds the optimal memory setting that balances execution duration and cost, often finding a sweet spot that minimizes total compute cost.

AWS Practice Test

AWS Practice Test

AWS DevOps Cost Optimization 2