AWS DevOps DevOps Automation Tools & Scripting Techniques 2

Question 1

A DevOps engineer needs to run a shell script as a post-deploy hook in AWS CodeDeploy. Which AppSpec file section should contain this script reference?

Accepted Answer

ApplicationStart

Answer

The ApplicationStart lifecycle hook runs scripts after the application files have been installed, making it the correct place for post-deploy startup logic.

Question 2

Which AWS CLI command lists all available parameter names stored in AWS Systems Manager Parameter Store under a specific path prefix?

Accepted Answer

aws ssm get-parameters-by-path --path /myapp/

Answer

aws ssm get-parameters-by-path retrieves all parameters within a specified path hierarchy, making it ideal for prefix-based lookups.

Question 3

In a Jenkins pipeline, a developer wants to skip a stage if a specific environment variable is not set. Which Jenkinsfile construct achieves this?

Accepted Answer

when { environment name: 'VAR', value: 'true' }

Answer

The 'when' directive with 'environment' condition evaluates the stage conditionally based on whether the named environment variable matches the given value.

Question 4

A team uses AWS Systems Manager Run Command to execute scripts across 50 EC2 instances simultaneously. What is the recommended way to avoid overwhelming all instances at once?

Accepted Answer

Use --max-concurrency and --max-errors parameters

Answer

--max-concurrency limits how many instances execute simultaneously while --max-errors defines the failure threshold before the command halts.

Question 5

Which Python boto3 pattern is considered best practice for handling AWS API throttling in automation scripts?

Accepted Answer

Use exponential backoff with jitter on ThrottlingException

Answer

Exponential backoff with jitter spreads retry attempts over time, reducing contention and preventing thundering herd problems when AWS throttles API calls.

AWS Practice Test

AWS Practice Test

AWS DevOps DevOps Automation Tools & Scripting Techniques 2