Discover the optimal Amazon EC2 instance purchasing model for provisioning uninterruptible instances with per-second billing. Learn how to meet your workload requirements cost-effectively.
Table of Contents
Question
A company needs to provision uninterruptible Amazon EC2 instances, when needed, and pay for compute capacity by the second.
Which EC2 instance purchasing option will meet these requirements?
A. Reserved Instances
B. Spot Instances
C. On-Demand Instances
D. Dedicated Instances
Answer
C. On-Demand Instances
Explanation
On-Demand Instances are the ideal EC2 instance purchasing option to meet the stated requirements for several reasons:
- Uninterruptible: On-Demand Instances are not interrupted by AWS, unlike Spot Instances which can be interrupted with a 2-minute notification when EC2 needs the capacity back. On-Demand Instances will continue running until you stop or terminate them.
- Per-second billing: On-Demand Instances support per-second billing, enabling you to pay for compute capacity by the second as required. Per-second billing is available for Linux instances launched in any region and for all instance types.
- Provision when needed: On-Demand Instances let you pay for compute capacity by the hour or second with no long-term commitments. This aligns with the need to provision instances when needed without upfront costs or usage obligations.
Reserved Instances require an upfront commitment for a 1 or 3 year term. Spot Instances do not guarantee uninterrupted operation. Dedicated Instances run on single-tenant hardware but still use the On-Demand, Reserved, or Spot pricing models.
Therefore, On-Demand Instances provide the uninterruptible operation, per-second billing, and flexible provisioning required to meet the company’s stated needs, making them the optimal choice among the given EC2 purchasing options.
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