Amazon EC2 Spot Instances
Amazon EC2 Spot Instances are unused EC2 instances whose capacity is available for purchase at a significantly lower price compared to On-Demand instances. Spot Instances can be used for fault-tolerant, flexible workloads or applications with significant cost savings. However, they can be interrupted and reclaimed by AWS with a two-minute notice when AWS requires the capacity back, so they are best suited for workloads that can handle occasional interruptions.
Guide: Amazon EC2 Spot Instances
What are Amazon EC2 Spot Instances?
Amazon EC2 Spot Instances provide you with the ability to purchase spare computing power at a discount from the on-demand price. It allows you to use unused EC2 instances which are available for less than the On-Demand price.
Why are Amazon EC2 Spot Instances important?
Spot Instances are important because they can reduce costs of running your applications, perform fault-tolerant workloads, or accelerate workloads at a lower cost. It allows businesses to optimize their costs on the AWS cloud and increase their computing power without substantial investments.
How does Amazon EC2 Spot Instances work?
When you request Spot Instances, you provide a maximum price you are willing to pay per instance hour. If your request is successful and your instance is terminated or interrupted by Amazon EC2, you won't be charged for your usage in that hourly period.
Exam Tips: Answering Questions on Amazon EC2 Spot Instances
1. Understand the pricing model: The pricing for Spot Instances is market-based, and it fluctuates based on supply and demand for unused EC2 instances. Hence, they are significantly cheaper than regular instances.
2. Spot Instance Interruptions: Spot instances may be interrupted by Amazon EC2 for price, capacity, or a Spot Instance termination request. If your Spot Instance is terminated or interrupted by Amazon EC2 in the first instance hour, you will not be charged for that hour.
3. Use Cases: Make sure you know the various use scenarios. They are ideal for data analysis, batch jobs, background processing, and optional tasks.
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