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Amazon AWS Certified DevOps Engineer - Professional Sample Questions (Q573-Q578):

NEW QUESTION # 573
A company has developed a Ruby on Rails content management platform. Currently, OpsWorks with several stacks for dev, staging, and production is being used to deploy and manage the application. Now the company wants to start using Python instead of Ruby. How should the company manage the new deployment? Choose the correct answer from the options below

A. Update the existing stack with Python application code and deploy the application using the deploy life-cycle action to implement the application code.
B. Create a new stack that contains a new layer with the Python code. To cut over to the new stack the company should consider using Blue/Green deployment
C. Create a new stack that contains the Python application code and manage separate deployments of the application via the secondary stack using the deploy lifecycle action to implement the application code.
D. Create a new stack that contains the Python application code and manages separate deployments of the application via the secondary stack.

Answer: B

Explanation:
Explanation
Blue/green deployment is a technique for releasing applications by shifting traffic between two identical environments running different versions of the application.
Blue/green deployments can mitigate common risks associated with deploying software, such as downtime and rollback capability Please find the below link on a white paper for blue green

deployments
* https://d03wsstatic.com/whitepapers/AWS_Blue_Green_Deployments.pdf

NEW QUESTION # 574
To access the AWS Security Token Service (STS) you can issue calls directly to the AWS STS Query API.
This API is a web service interface that accepts ______ requests.

A. PUT
B. POST
C. HTTPS
D. GET

Answer: C

Explanation:
The Query API for IAM and AWS STS lets you call service actions. Query API requests are HTTPS requests that must contain an Action parameter to indicate the action to be performed. IAM and AWS STS support GET and POST requests for all actions, that is, the API does not require you to use GET for some actions and POST for others.
Reference:
http://docs.aws.amazon.com/IAM/latest/UserGuide/programming.html

NEW QUESTION # 575
You have an ELB setup in AWS with EC2 instances running behind it. You have been requested to monitor the incoming connections to the ELB. Which of the below options can suffice this requirement?

A. Create a custom metric CloudWatch filter on your load balancer
B. Enable access logs on the load balancer
C. Use a CloudWatch Logs Agent
D. UseAWSCIoudTrail with your load balancer

Answer: B

Explanation:
Clastic Load Balancing provides access logs that capture detailed information about requests sent to your load balancer. Cach log contains information such as the
time the request was received, the client's IP address, latencies, request paths, and server responses. You can use these access logs to analyze traffic patterns and
to troubleshoot issues.
Option A is invalid because this service will monitor all AWS services
Option C and D are invalid since CLB already provides a logging feature.
For more information on ELB access logs, please refer to the below document link: from AWS
http://docs.aws.amazon.com/elasticloadbalancing/latest/classic/access-log-collection. html

NEW QUESTION # 576
When deploying to a Docker swarm, which section of the docker-compose file defines configuration related to the deployment and running of services?

A. deploy
B. services
C. args
D. build

Answer: A

Explanation:
Version 3 only.
Specify configuration related to the deployment and running of services. This only takes effect when deploying to a swarm withdocker stack deploy, and is ignored by docker-compose up and docker-compose run.
Reference: https://docs.docker.com/compose/compose-file/#deploy

NEW QUESTION # 577
You recently encountered a major bug in your Windows-based 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, your team discussed the need to provide a quicker way to roll back failed deployments.
You currently run your web application on Amazon EC2 using Windows 2012R2 and use Elastic Load Balancing for your load balancing needs.
Which technique should you use to solve this problem?

A. Create deployable versioned bundles of your application.
Store the bundle on Amazon S3. Re-deploy your web application using an AWS OpsWorks stack, and use AWS OpsWorks application versioning to initiate a rollback during failures.
B. Re-deploy your web application using an AWS OpsWorks stack, and use the AWS OpsWorks auto-rollback feature to initiate a rollback during failures.
C. Create deployable versioned bundles of your application. Store the bundles on Amazon S3.
Re-deploy your web application on Elastic Beanstalk, and enable the Elastic Beanstalk auto- rollback feature tied to CloudWatch metrics that define failure.
D. Re-deploy your web application using Elastic Beanstalk, and use the Elastic Beanstalk application versions when deploying.
During failures, re-deploy the previous version to the Elastic Beanstalk environment.
E. Re-deploy your web application using Elastic Beanstalk, and use the Elastic Beanstalk API to trigger a FailedDeployment API call to initiate a rollback to the previous version.

Answer: D

NEW QUESTION # 578
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