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To be eligible for the exam, the candidate must have already obtained the AWS Certified Developer - Associate or AWS Certified SysOps Administrator - Associate certification. Additionally, the candidate should have at least two years of experience in a DevOps role and be proficient in at least one programming language.

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Amazon AWS Certified DevOps Engineer - Professional Sample Questions (Q426-Q431):

NEW QUESTION # 426
Management has reported an increase in the monthly bill from Amazon Web Services, and they are extremely concerned with this increased cost. Management has asked you to determine the exact cause of this increase.
After reviewing the billing report, you notice an increase in the data transfer cost. How can you provide management with a better insight into data transfer use?

A. Deliver custom metrics to Amazon CloudWatch per application that breaks down application data transfer into multiple, more specific data points.
D- Using Amazon CloudWatch metrics, pull your Elastic Load Balancing outbound data transfer metrics monthly, and include them with your billing report to show which application is causing higher bandwidth usage.
B. Use Amazon CloudWatch Logs to run a map-reduce on your logs to determine high usage and data transfer.
C. Update your Amazon CloudWatch metrics to use five-second granularity, which will give better detailed metrics that can be combined with your billing data to pinpoint anomalies.

Answer: A

Explanation:
Explanation
You can publish your own metrics to CloudWatch using the AWS CLI or an API. You can view statistical graphs of your published metrics with the AWS Management Console.
CloudWatch stores data about a metric as a series of data points. Each data point has an associated time stamp.
You can even publish an aggregated set of data points called a statistic set.
If you have custom metrics specific to your application, you can give a breakdown to the management on the exact issue.
Option A won't be sufficient to provide better insights.
Option B is an overhead when you can make the application publish custom metrics Option D is invalid because just the ELB metrics will not give the entire picture For more information on custom metrics, please refer to the below document link: from AWS
* http://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/publishingMetrics.htmI

NEW QUESTION # 427
You recently encountered a major bug in your web application during a deployment cycle. During this failed deployment, it took the team four hours to roll back to a previously working state, which left customers with a poor user experience. During the post-mortem, you team discussed the need to provide a quicker, more robust way to roll back failed deployments. You currently run your web application on Amazon EC2 and use Elastic Load Balancingforyour load balancing needs.
Which technique should you use to solve this problem?

A. Createdeployable versioned bundles of your application. Store the bundle on AmazonS3. Use an AWS OpsWorks stack to redeploy your web application and use AWSOpsWorks application versioningto initiate a rollback during failures.
B. Createdeployable versioned bundles of your application. Store the bundle on AmazonS3. Re-deploy your web application on Elastic Beanstalk and enable the ElasticBeanstalk auto - rollbackfeature tied to Cloud Watch metrics that definefailure.
C. Usean AWS OpsWorks stack to re-deploy your web application and use AWS OpsWorksDeploymentCommand to initiate a rollback during failures.
D. UsingElastic BeanStalk redeploy your web application and use the Elastic BeanStalkAPI to trigger a FailedDeployment API call to initiate a rollback to theprevious version.

Answer: C

Explanation:
Explanation
The AWS Documentation mentions the following
AWS DeploymentCommand has a rollback option in it. Following commands are available for apps to use:
deploy: Deploy App.
Ruby on Rails apps have an optional args parameter named migrate. Set Args to {"migrate":["true"]) to migrate the database.
The default setting is {"migrate": ["false"]).
The "rollback" feature Rolls the app back to the previous version.
When we are updating an app, AWS OpsWorks stores the previous versions, maximum of upto five versions.
We can use this command to roll an app back as many as four versions.
Reference Link:
* http://docs