A Company Is Migrating an Application to AWS That Runs

question 386

Multiple Choice

A company is migrating an application to AWS that runs on a single Amazon EC2 instance. Because of licensing limitations, the application does not support horizontal scaling. The application will be using Amazon Aurora for its database. How can the DevOps Engineer architect automated healing to automatically recover from EC2 and Aurora failures, in addition to recovering across Availability Zones (AZs) , in the MOST cost-effective manner?

• A) Create an EC2 Auto Scaling group with a minimum and maximum instance count of 1, and have it span across AZs. Use a single-node Aurora instance.
• B) Create an EC2 instance and enable instance recovery. Create an Aurora database with a read replica in a second AZ, and promote it to a primary database instance if the primary database instance fails.
• C) Create an Amazon CloudWatch Events rule to trigger an AWS Lambda function to start a new EC2 instance in an available AZ when the instance status reaches a failure state. Create an Aurora database with a read replica in a second AZ, and promote it to a primary database instance when the primary database instance fails.
• D) Assign an Elastic IP address on the instance. Create a second EC2 instance in a second AZ. Create an Amazon CloudWatch Events rule to trigger an AWS Lambda function to move the Elastic IP address to the second instance when the first instance fails. Use a single-node Aurora instance.

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Definitions:

Laissez-Faire Economics

A market system with minimal government intervention, where private parties are free to conduct business as they see fit.

Keynes

Refers to John Maynard Keynes, a British economist whose theories on the impact of government policies on economic recessions and depressions have significantly influenced modern macroeconomics.

The Classicals

A group of economists in the late 18th and early 19th centuries who believed in free markets, free trade, and limited government intervention in the economy.

Full Employment

A situation in an economy where all available labor resources are being used in the most economically efficient way.