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A company's application on EC2 instances relies on a Single-AZ RDS for MySQL DB instance. The SysOps administrator needs to ensure failover to minimize downtime.
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A SysOps administrator is optimizing the cost of a workload. The workload is running in multiple AWS Regions and is using AWS Lambda with Amazon EC2 On-Demand Instances for the compute. The overall usage is predictable. The amount of compute that is consumed in each Region varies, depending on the users' locations. Which approach should the SysOps administrator use to optimize this workload?
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Question 246 - SOA-C02 discussion

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A company hosts a web application on an Amazon EC2 instance. The web server logs are published to Amazon CloudWatch Logs. The log events have the same structure and include the HTTP response codes that are associated with the user requests. The company needs to monitor the number of times that the web server returns an HTTP 404 response. What is the MOST operationally efficient solution that meets these requirements?

A.
Create a CloudWatch Logs metric filter that counts the number of times that the web server returns an HTTP 404 response.
Answers
A.
Create a CloudWatch Logs metric filter that counts the number of times that the web server returns an HTTP 404 response.
B.
Create a CloudWatch Logs subscription filter that counts the number of times that the web server returns an HTTP 404 response.
Answers
B.
Create a CloudWatch Logs subscription filter that counts the number of times that the web server returns an HTTP 404 response.
C.
Create an AWS Lambda function that runs a CloudWatch Logs Insights query that counts the number of 404 codes in the log events during the past hour.
Answers
C.
Create an AWS Lambda function that runs a CloudWatch Logs Insights query that counts the number of 404 codes in the log events during the past hour.
D.
Create a script that runs a CloudWatch Logs Insights query that counts the number of 404 codes in the log events during the past hour.
Answers
D.
Create a script that runs a CloudWatch Logs Insights query that counts the number of 404 codes in the log events during the past hour.
Suggested answer: A

Explanation:

This is the most operationally efficient solution that meets the requirements, as it will allow the company to monitor the number of times that the web server returns an HTTP 404 response in realtime. The other solutions (creating a CloudWatch Logs subscription filter, an AWS Lambda function, or a script) will require additional steps and resources to monitor the number of times that the web server returns an HTTP 404 response.

A metric filter allows you to search for specific terms, phrases, or values in your log events, and then to create a metric based on the number of occurrences of those search terms. This allows you to create a CloudWatch Metric that can be used to create alarms and dashboards, which can be used to monitor the number of HTTP 404 responses returned by the web server.

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asked 16/09/2024
Mark Chow
43 questions
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