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Difficulty: MediumAWS Free Tier

An individual developer launches two t2.microt2.micro Amazon EC2 Linux instances under a new AWS account that is within its first 1212 months. Both instances run continuously for the entire month of November (3030 days). The developer has no other EC2 resources active. Which of the following describes how the developer will be billed for these EC2 instances under the AWS Free Tier?

  1. The developer will be billed for 690690 hours of EC2 usage because the 750750 free hours are shared across all running instances in a billing month.Answer
  2. B
    The developer will not be charged because the 750750-hour monthly limit is allocated per instance, allowing each instance to run up to 750750 hours for free.
  3. C
    The developer will be charged for all 1,4401,440 hours of EC2 usage because running multiple instances concurrently voids the Free Tier benefit.
  4. D
    The developer will be charged for 720720 hours of EC2 usage because the Free Tier benefit only applies to the first instance launched in the account.

Answer

The developer will be billed for 690690 hours of EC2 usage because the 750750 free hours are shared across all running instances in a billing month.
Under the AWS Free Tier, the monthly allowance of 750750 hours for t2.microt2.micro or t3.microt3.micro Linux instances is shared across all running instances in the account. Running two instances continuously for 3030 days results in 1,4401,440 total hours. Subtracting the 750750 free hours leaves 690690 hours that will be billed at the standard On-Demand rate.

Step-by-Step Solution

1
Calculate the total hours of EC2 usage accumulated by the instances during the month.
2 instances×30 days×24 hours/day=1,440 total hours2 \text{ instances} \times 30 \text{ days} \times 24 \text{ hours/day} = 1,440 \text{ total hours}.
To determine billing, we must first find the sum of all run hours across all qualifying instances.
2
Apply the AWS Free Tier monthly allowance for t2.microt2.micro instances.
1,440 total hours−750 free hours=690 billable hours1,440 \text{ total hours} - 750 \text{ free hours} = 690 \text{ billable hours}.
The monthly Free Tier limit for EC2 is 750750 hours, which is subtracted from the total aggregated usage.

Key Concept

Aggregation of AWS Free Tier monthly limits across multiple resources
Estimated Time:1m 30s
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Topics

AWS Free Tier

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