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The AWS Certified DevOps Engineer - Professional (DOP-C01) exam is designed for individuals who possess extensive knowledge and experience in operating, provisioning and managing distributed application systems on the AWS platform. AWS Certified DevOps Engineer - Professional certification validates the skills and expertise required to design, deploy, operate and manage highly available, scalable and fault-tolerant systems on the AWS cloud platform. The DOP-C01 Exam is intended for experienced DevOps professionals who have a deep understanding of DevOps methodologies, practices and tools, as well as hands-on experience deploying and managing AWS services.

Amazon AWS Certified DevOps Engineer - Professional Sample Questions (Q534-Q539):

NEW QUESTION # 534
You need to create a Route53 record automatically in CloudFormation when not running in production during all launches of a Template. How should you implement this?

A. Create two templates, one with the Route53 record and one without it. Use the one without it when deploying to production.
B. Use a <code>Parameter</code> for <code>environment</code>, and add a
<code>Condition</code> on the Route53 <code>Resource</code> in the template to create the record only when <code>environment</code> is not <code>production</code>.
C. Create two templates, one with the Route53 record value and one with a null value for the record.
Use the one without it when deploying to production.
D. Use a <code>Parameter</code> for <code>environment</code>, and add a
<code>Condition</code> on the Route53 <code>Resource</code> in the template to create the record with a null string when <code>environment</code> is <code>production</code>.

Answer: B

Explanation:
The best way to do this is with one template, and a Condition on the resource. Route53 does not allow null strings for records.
http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/conditions-section- structure.html

NEW QUESTION # 535
You currently have the following setup in AWS
1) An Elastic Load Balancer
2) Auto Scaling Group which launches EC2 Instances
3) AMIs with your code pre-installed
You want to deploy the updates of your app to only a certain number of users. You want to have a cost-effective solution. You should also be able to revert back quickly. Which of the below solutions is the most feasible one?

A. Redeploy with AWS Elastic Beanstalk and Elastic Beanstalk versions. Use Route 53 Weighted Round Robin records to adjust the proportion of traffic hitting the two ELBs
B. Create a full second stack of instances, cut the DNS over to the new stack of instances, and change the DNS back if a rollback is needed.
C. Create new AM Is with the new app. Then use the new EC2 instances in half proportion to the older instances.
D. Create a second ELB, and a new Auto Scaling Group assigned a new Launch Configuration. Create a new AMI with the updated app. Use Route53 Weighted Round Robin records to adjust the proportion of traffic hitting the two ELBs.

Answer: D

Explanation:
The Weighted Routing policy of Route53 can be used to direct a proportion of traffic to your application. The best option is to create a second CLB, attach the new Autoscaling Group and then use Route53 to divert the traffic.
Option B is wrong because just having EC2 instances running with the new code will not help.
Option C is wrong because Clastic beanstalk is good for development environments, and also there is no mention of having 2 environments where environment url's
can be swapped.
Option D is wrong because you still need Route53 to split the traffic.
For more information on Route53 routing policies, please refer to the below link:
http://docs.aws.a mazon.com/Route53/latest/DeveloperGuide/routing-policy. html

NEW QUESTION # 536
A DevOps engineer is deploying a new version of a company's application in an AWS CodeDeploy deployment group associated with its Amazon EC2 instances. After some time, the deployment fails. The engineer realizes that all the events associated with the specific deployment ID are in a Skipped status, and code was not deployed in the instances associated with the deployment group.
What are valid reasons for this failure? (Choose two.)

A. The IAM user who triggered the application deployment does not have permission to interact with the CodeDeploy endpoint.
B. An instance profile with proper permissions was not attached to the target EC2 instances.
C. The target EC2 instances were not properly registered with the CodeDeploy endpoint.
D. The appspec.yml file was not included in the application revision.
E. The networking configuration does not allow the EC2 instances to reach the internet via a NAT gateway or internet gateway, and the CodeDeploy endpoint cannot be reached.

Answer: B,E

Explanation:
https://docs.aws.amazon.com/codedeploy/latest/userguide/troubleshooting- deployments.html#troubleshooting-skipped-lifecycle-even

NEW QUESTION # 537
Which of the following is not a rolling type update which is present for Configuration Updates when it comes to the Elastic Beanstalk service

A. Immutable
B. Rolling based on Instances
C. Rolling based on time
D. Rolling based on Health

Answer: B

Explanation:
Explanation
When you go to the configuration of your Elastic Beanstalk environment, below are the updates that are possible

The AWS Documentation mentions
1) With health-based rolling updates. Elastic Beanstalk waits until instances in a batch pass health checks before moving on to the next batch.
2) For time-based rolling updates, you can configure the amount of time that Elastic Beanstalk waits after completing the launch of a batch of instances before moving on to the next batch. This pause time allows your application to bootsrap and start serving requests.
3) Immutable environment updates are an alternative to rolling updates that ensure that configuration changes that require replacing instances are applied efficiently and safely. If an immutable environment update fails, the rollback process requires only terminating an Auto Scalinggroup. A failed rolling update, on the other hand, requires performing an additional rolling update to roll back the changes.
For more information on Rolling updates for Elastic beanstalk configuration updates, please visit the below URL:
* http://docs.aws.amazon.com/elasticbeanstalk/latest/dg/using-features.ro11ingupdates.html

NEW QUESTION # 538
A company is adopting AWS CodeDeploy to automate its application deployments for a Java-Apache Tomcat application with an Apache webserver. The Development team started with a proof of concept, created a deployment group for a developer environment, and performed functional tests within the application. After completion, the team will create additional deployment groups for staging and production The current log level is configured within the Apache settings, but the team wants to change this configuration dynamically when the deployment occurs, so that they can set different log level configurations depending on the deployment group without having a different application revision for each group. How can these requirements be met with the LEAST management overhead and without requiring different script versions for each deployment group?

A. Tag the Amazon EC2 instances depending on the deployment group. Then place a script into the application revision that calls the metadata service and the EC2 API to identify which deployment group the instance is part of. Use this information to configure the log level settings. Reference the script as part of the Afterinstall lifecycle hook in the appspec.yml file.
B. Create a script that uses the CodeDeploy environment variable DEPLOYMENT_GROUP_NAME to identify which deployment group the instances is part of. Use this information to configure the log level settings. Reference this script as part of the BeforeInstall lifecycle hook in the appspec.yml file
C. Create a CodeDeploy custom environment variable for each environment. Then place a script into the application revision that checks this environment variable to identify which deployment group the instance is part of. Use this information to configure the log level settings. Reference this script as part of the ValidateService lifecycle hook in the appspec.yml file.
D. Create a script that uses the CodeDeploy environment variable DEPLOYMENT_GROUP_ID to identify which deployment group the instance is part of to configure the log level settings. Reference this script as part of the Install lifecycle hook in the appspec.yml file.

Answer: B

Explanation:
https://docs.aws.amazon.com/codedeploy/latest/userguide/reference-appspec-file-structure-hooks.html

NEW QUESTION # 539
......

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