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NEW QUESTION 31
You are currently using Elastic Beanstalk to host your production environment. You need to rollout updates to
your application hosted on this environment. This is a critical application which is why there is a requirement
that the rollback, if required, should be carried out with the least amount of downtime. Which of the following
deployment strategies would ideally help achieve this purpose

• A. Create another parallel environment in elastic beanstalk. Use the Swap URL feature.
• B. Use Rolling updates in Elastic Beanstalk so that if the deployment fails, the rolling updates feature
  would roll back to the last deployment.
• C. Create another parallel environment in elastic beanstalk. Create a new Route53 Domain name for the
  new environment and release that url to the users.
• D. Create a Cloudformation template with the same resources as those in the Elastic beanstalk environment.
  If the deployment fails, deploy the Cloudformation template.

Answer: A

Explanation:
Explanation
Since the requirement is to have the least amount of downtime, the ideal way is to create a blue green
deployment environment and then use the Swap URL feature
to swap environments for the new deployment and then do the swap back, incase the deployment fails.
The AWS Documentation mentions the following on the SWAP url feature of Elastic Beanstalk
Because Elastic Beanstalk performs an in-place update when you update your application versions, your
application may become unavailable to users for a short period of time. It is possible to avoid this downtime
by performing a blue/green deployment, where you deploy the new version to a separate environment, and
then
swap CNAMCs of the two environments to redirect traffic to the new version instantly.

NEW QUESTION 32
A mobile application running on eight Amazon EC2 instances is relying on a third-party API endpoint. The third- party service has a high failure rate because of limited capacity, which is expected to be resolved in a few weeks.
In the meantime, the mobile application developers have added a retry mechanism and are logging failed API requests. A DevOps Engineer must automate the monitoring of application logs and count the specific error messages; if there are more than 10 errors within a 1-minute window, the system must issue an alert.
How can the requirements be met with MINIMAL management overhead?

• A. Install the Amazon CloudWatch Logs agent on all instances to push the access logs to CloudWatch Logs.
  Create a CloudWatch Events rule to count the error messages every minute, and trigger a CloudWatch alarm if the count exceeds 10 errors.
• B. Install the Amazon CloudWatch Logs agent on all instances to push the application logs to CloudWatch Logs. Use metric filters to count the error messages every minute, and trigger a CloudWatch alarm if the count exceeds 10 errors.
• C. Deploy a custom script on all instances to check application logs regularly in a cron job. Count the number of error messages every minute, and push a data point to a custom. CloudWatch metric. Trigger a CloudWatch alarm if the custom metric reaches 10 errors in a 1-minute period.
• D. Install the Amazon CloudWatch Logs agent on all instances to push the application logs to CloudWatch Logs. Use a metric filter to generate a custom CloudWatch metric that records the number of failures and triggers a CloudWatch alarm if the custom metric reaches 10 errors in a 1-minute period.

Answer: D

NEW QUESTION 33
You have a number of Cloudformation stacks in your IT organization. Which of the following commands will help see all the cloudformation stacks which have a completed status?

• A. stacks-complete
• B. describe-stacks
• C. list-stacks
• D. list-templates

Answer: C

Explanation:
Explanation
The following is the description of the list-stacks command
Returns the summary information for stacks whose status matches the specified StackStatusFilter. Summary information for stacks that have been deleted is kept for 90 days after the stack is deleted. If no stack-status-filter is specified, summary information for all stacks is returned (including existing stacks and stacks that have been deleted).
For more information on the list-stacks command please visit the below link
http://docs.aws.amazon.com/cli/latest/reference/cloudformation/list-stacks.
html

NEW QUESTION 34
......

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