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

BeforeInstall

Answer

AfterInstall

Answer

ValidateService

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 --path /myapp/

Answer

aws ssm describe-parameters --filters Key=Path,Values=/myapp/

Answer

aws ssm list-parameters --prefix /myapp/

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

post { always {} }

Answer

options { skipStagesAfterUnstable() }

Answer

triggers { cron('H/15 * * * *') }

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

Schedule separate Run Command jobs for each instance

Answer

Use AWS Lambda to stagger execution

Answer

Enable SSM Inventory before running commands

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

Catch ClientError and immediately retry without delay

Answer

Switch to a different AWS region on throttling

Answer

Increase the API rate limit via AWS Support before running scripts

Question 6

A CloudFormation custom resource needs to signal success or failure back to the stack. What mechanism does the Lambda function use to communicate this?

Accepted Answer

Send a PUT request to the pre-signed S3 URL in the ResponseURL event field

Answer

Return an HTTP status code directly to CloudFormation

Answer

Write the result to an S3 bucket that CloudFormation polls

Answer

Publish a message to an SNS topic monitored by CloudFormation

Question 7

When writing an AWS CDK app in Python, which command synthesizes the CloudFormation template without deploying it?

Accepted Answer

cdk synth

Answer

cdk deploy --dry-run

Answer

cdk diff

Answer

cdk preview