You are a Devops engineerforyourcompany. You have been instructed to deploy docker containers using the
Opswork service. How could you achieve this? Choose 2 answers from the options given below

• A.Usecustom cookbooks for your Opswork stack and provide the Git repository which hasthe chef recipes
  for the Docker containers. ^
• B.UseElastic beanstalk to deploy docker containers since this is not possible inOpswork. Then attach the
  elastic beanstalk environment as a layer in Opswork.
• C.UseCloudformation to deploy docker containers since this is not possible inOpswork. Then attach the
  Cloudformation resources as a layer in Opswork.
• D.Inthe App for Opswork deployment, specify the git url for the recipes which willdeploy the applications
  in the docker environment.

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Which of these is not a Pseudo Parameter in AWS CloudFormation?

• A.AWS::StackName
• B.AWS::AccountId
• C.AWS::StackArn
• D.AWS::NotificationARNs

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A publishing company used AWS Elastic Beanstalk, Amazon S3, and Amazon DynamoDB to develop a web application. The web application has increased dramatically in popularity, resulting in unpredictable spikes in traffic. A DevOps Engineer has noted that 90% of the requests are duplicate read requests. How can the Engineer improve the performance of the website?

• A.Use Amazon ElastiCache for Redis to cache repeated read requests to DynamoDB and AWS Elemental MediaStore to cache images stored in S3.
• B.Use Amazon ElastiCache for Memcached to cache repeated read requests to DynamoDB and Varnish to cache images stored in S3.
• C.Use DynamoDB Accelerator to cache repeated read requests to DynamoDB and Amazon CloudFront to cache images stored in S3.
• D.Use DynamoDB Streams to cache repeated read requests to DynamoDB and API Gateway to cache images stored in S3.

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You have a web application running on six Amazon EC2 instances, consuming about 45% of resources on
each instance. You are using auto-scaling to make sure that six instances are running at all times. The number
of requests this application processes is consistent and does not experience spikes. The application is critical to
your business and you want high availability at all times. You want the load to be distributed evenly between
all instances. You also want to use the same Amazon Machine Image (AMI) for all instances. Which of the
following architectural choices should you make?

• A.Deploy6 EC2 instances in one availability zone and use Amazon Elastic Load Balancer.
• B.Deploy3 EC2 instances in one region and 3 in another region and use Amazon ElasticLoad Balancer.
• C.Deploy3 EC2 instances in one availability zone and 3 in another availability zone anduse Amazon
  Elastic Load Balancer.
• D.Deploy2 EC2 instances in three regions and use Amazon Elastic Load Balancer.

Correct Answer: C

Explanation
Option A is automatically incorrect because remember that the question asks for high availability. For option
A, if the A2 goes down then the entire application fails.
For Option B and D, the CLB is designed to only run in one region in aws and not across multiple regions. So
these options are wrong.
The right option is C.
The below example shows an Elastic Loadbalancer connected to 2 EC2 instances connected via Auto Scaling.
This is an example of an elastic and scalable web tier.
By scalable we mean that the Auto scaling process will increase or decrease the number of CC2 instances as
required.

For more information on best practices for AWS Cloud applications, please visit the below URL:
* https://d03wsstatic.com/whitepapers/AWS_Cloud_Best_Practices.pdf

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A company has a website in an AWS Elastic Beanstalk load balancing and automatic scaling environment.
This environment has an Amazon RDS MySQL instance configured as its database resource. After a sudden increase in traffic, the website started dropping traffic. An administrator discovered that the application on some instances is not responding as the result of out-of-memory errors. Classic Load Balancer marked those instances as out of service, and the health status of Elastic Beanstalk enhanced health reporting is degraded.
However, Elastic Beanstalk did not replace those instances. Because of the diminished capacity behind the Classic Load Balancer, the application response times are slower for the customers.
Which action will permanently fix this issue?

• A.Clone the Elastic Beanstalk environment. When the new environment is up, swap CNAME and terminate the earlier environment.
• B.Write a cron script for restraining the web server process when memory is full, and deploy it with AWS Systems Manager.
• C.Temporarily change the maximum number of instances in the Auto Scaling group to allow the group to support more traffic.
• D.Change the setting for the Auto Scaling group health check from Amazon EC2 to Elastic Load Balancing, and increase the capacity of the group.

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