AWS DevOps DevOps Automation Tools & Scripting Techniques 5

Question 1

A DevOps engineer wants to validate a CloudFormation template for syntax errors before deploying it. Which AWS CLI command performs this check?

Accepted Answer

aws cloudformation validate-template --template-body file://template.yml

Answer

aws cloudformation validate-template checks the template for JSON/YAML syntax errors and CloudFormation-specific structural issues without deploying resources.

Question 2

In AWS Step Functions, which state type is used to pause execution for a specific duration or until a specific timestamp before continuing?

Accepted Answer

Wait state

Answer

The Wait state suspends workflow execution for a specified number of seconds or until an absolute timestamp without consuming compute resources during the pause.

Question 3

A team wants to enforce coding standards in their Python Lambda functions by running flake8 as part of the CI pipeline. Where in a CodeBuild buildspec.yml should this linting step run?

Accepted Answer

pre_build phase

Answer

Linting in pre_build runs code quality checks before the main build process, allowing the build to fail fast if code standards are not met.

Question 4

A CloudFormation StackSet is used to deploy resources across 10 AWS accounts. The team wants at most 3 accounts to be updated simultaneously. Which parameter controls this?

Accepted Answer

--operation-preferences MaxConcurrentCount=3

Answer

--operation-preferences with MaxConcurrentCount=3 limits StackSet deployment parallelism so only 3 accounts are updated at any given time.

Question 5

Which technique allows an AWS CodeDeploy blue/green deployment to automatically shift 10% of traffic to the new version, monitor for 10 minutes, then shift the remaining 90%?

Accepted Answer

Use a CodeDeploy deployment configuration with a Linear10PercentEvery10Minutes predefined configuration

Answer

CodeDeploy's Linear10PercentEvery10Minutes predefined deployment configuration incrementally shifts traffic in 10% blocks every 10 minutes for controlled rollouts.

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AWS DevOps DevOps Automation Tools & Scripting Techniques 5