A Web Application for Healthcare Services Runs on Amazon EC2

question 47

Multiple Choice

A web application for healthcare services runs on Amazon EC2 instances behind an ELB Application Load Balancer. The instances run in an Amazon EC2 Auto Scaling group across multiple Availability Zones. A DevOps Engineer must create a mechanism in which an EC2 instance can be taken out of production so its system logs can be analyzed for issues to quickly troubleshoot problems on the web tier. How can the Engineer accomplish this task while ensuring availability and minimizing downtime?

• A) Implement EC2 Auto Scaling groups cooldown periods. Use EC2 instance metadata to determine the instance state, and an AWS Lambda function to snapshot Amazon EBS volumes to preserve system logs.
• B) Implement Amazon CloudWatch Events rules. Create an AWS Lambda function that can react to an instance termination to deploy the CloudWatch Logs agent to upload the system and access logs to Amazon S3 for analysis.
• C) Terminate the EC2 instances manually. The Auto Scaling service will upload all log information to CloudWatch Logs for analysis prior to instance termination.
• D) Implement EC2 Auto Scaling groups with lifecycle hooks. Create an AWS Lambda function that can modify an EC2 instance lifecycle hook into a standby state, extract logs from the instance through a remote script execution, and place them in an Amazon S3 bucket for analysis.

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Definitions:

Bad Debt Expense

The expense recognized when receivables are no longer collectible, reflecting estimated losses from extending credit.

Percentage Rate

A proportion, often expressed as a percent, used to determine the interest to be charged or paid on a financial instrument or the growth rate of an investment.

Reported Earnings

The income stated in a company's financial statements, reflecting the company's performance over a specified period, typically a fiscal quarter or year.

Contra-Asset Account

A contra-asset account is an account used in a company's balance sheet to offset the balance of an associated asset account, reducing the net amount of both accounts.