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Spot Instances let you use spare EC2 capacity at discounts of up to 90% versus On-Demand pricing.

The catch: AWS can reclaim them with a short warning when it needs the capacity back.

Three pricing models:

• On-Demand — pay per second, no commitment, full price
• Reserved / Savings Plans — commit for 1-3 years, big discount
• Spot — cheapest, but interruptible

Spot shines for fault-tolerant, flexible workloads:

• Batch processing and data analysis
• CI/CD build runners
• Stateless web tiers behind a load balancer
• Containerized jobs

Before reclaiming a Spot Instance, AWS sends a two-minute interruption notice via instance metadata. Your app should check for it and shut down gracefully.

You can request Spot capacity through the CLI, an Auto Scaling group, or a Spot Fleet. Here is a simple run-instances request.

Auto Scaling groups support a mixed instances policy: combine On-Demand and Spot in one group, so a baseline stays reliable while Spot adds cheap capacity.

Spreading requests across many instance types and Availability Zones lowers the chance all your capacity is interrupted at once. This is called diversification.

Capacity Rebalancing proactively launches a replacement instance when a Spot Instance is at elevated risk of interruption, before the two-minute notice fires.

Because instances can vanish, keep state off the instance. Store data in S3, RDS, or DynamoDB, and treat compute as disposable.

ECS and EKS both support Spot capacity. The orchestrator reschedules tasks/pods when an instance is reclaimed, making Spot especially safe for containerized workloads.

A balanced strategy:

• Reserved/Savings Plans for steady baseline load
• On-Demand for unpredictable bursts
• Spot for flexible, fault-tolerant capacity

Test your Spot knowledge.

You learned cost-efficient compute:

• Spot offers up to 90% savings but is interruptible
• Watch the two-minute interruption notice
• Diversify across types and AZs
• Mix Spot, On-Demand, and Reserved for the best balance

Treat compute as disposable and Spot becomes a powerful cost lever.