AWS Spot pricing with Terraform

1. Communit
y
AWS Community
How To Save Resources With the
Terraform Module for AWS Spot
Instances
Vladimir Cageyv Samoylov

2. AWS Community
Key Takeaway
- What is EC2 Spot Instances and how it works
- The true cost of Spot Instances
- How we could programmatically get the max-price value

3. A Christmas Story and Huge Demand
for EC2

4. AWS Community
A December Surprise: Double the Payment for
AWS Spot Instances

5. Amazon EC2 Spot Instances
Who are you?

6. AWS EC2 Spot Instance = Unused
EC2 at a low price
More info: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/using-spot-instances.html

7. Interrupt readiness

8. AWS Community
2 minute termination notice. EC2 meta-data and
EventBridge
More info: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/spot-instance-termination-
notices.html

9. AWS Community
The Fault Injection Simulator can simulate
termination notices
More info: https://aws.amazon.com/fis/

10. Resilience and Elasticity with EC2
Auto Scaling Group

11. Using different Instance Types and
AZs increases launch chances

12. Spot Instance Advisor
More info: https://aws.amazon.com/ec2/spot/instance-advisor/

13. AWS Community
Spot Instance Advisor. Example

14. Allocation strategies for Spot Instances
More info: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-fleet-allocation-
strategy.html

15. AWS Community
Allocation strategies for Spot Instances
- price-capacity-optimized !!!
- capacity-optimized
- lowest-price
More info: https://aws.amazon.com/blogs/compute/introducing-price-capacity-optimized-
allocation-strategy-for-ec2-spot-instances/

16. Resilience with Capacity rebalance.
Get new EC2 in advance.
More info: https://ec2spotworkshops.com/ec2-auto-scaling-with-multiple-instance-types-and-
purchase-options/spot_resilience.html

17. AWS Community
EC2 Autoscaling Capacity rebalance
More info: https://github.com/awslabs/ec2-spot-labs/tree/master/ec2-spot-interruption-handler

18. Spot Instance Pricing
How much will I have to pay?

19. AWS Community
Cost Explorer

20. AWS Community
Spot Instance data feed
More info: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/spot-data-feeds.html

21. Charge = Spot Price

22. Spot Instance pricing history
More info: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/using-spot-instances-
history.html

23. AWS Community
Spot price history (example from docs)

24. AWS Community
Spot price history (December expectations)

25. Spot Max Price
More info: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/spot-requests.html#using-
spot-instances-request (step 10 in new console example)

26. What will happen if the Spot Max Price
is not specified?
More info: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/spot-requests.html#using-
spot-instances-request (step 10 in new console example)

27. What next? No more Spot Instances?

28. AWS Community
AWS CLI: aws ec2 describe-spot-price-history
More info: https://awscli.amazonaws.com/v2/documentation/api/latest/reference/ec2/describe-
spot-price-history.html

29. AWS Community
AWS API: EC2 DescribeSpotPriceHistory
More info:
https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_DescribeSpotPriceHistory.html

30. AWS Community
Terraform Module: ec2-spot-price
More info: https://github.com/fivexl/terraform-aws-ec2-spot-price

31. AWS Community
Initial data
AZ Type r5.2xlarge r5d.2xlarge r5a.2xlarge
eu-central-1a 0.20 0.20 0.20
eu-central-1b 0.20 0.15 0.10
eu-central-1c 0.20 0.30 0.25
*These prices are not real prices for EC2 Spot Instance

32. AWS Community
Example: All Instance Types in all AZs with
increased reliability.
module "ec2_spot_price" {
source = "fivexl/ec2-spot-price/aws"
version = "2.0.0"
instance_types_list = ["r5.2xlarge", "r5d.2xlarge", "r5a.2xlarge"]
availability_zones_names_list = ["eu-central-1a", "eu-central-1b", "eu-central-1c"]
сustom_price_modifier = 1.1
}
output "spot_price_current_max_mod" {
value = module.ec2_spot_price.spot_price_current_max_mod
}
Result: 0.33

33. AWS Community
Example: Cheapest as possible
module "ec2_spot_price" {
source = "fivexl/ec2-spot-price/aws"
version = "2.0.0"
instance_types_list = ["r5.2xlarge", "r5d.2xlarge", "r5a.2xlarge"]
availability_zones_names_list = ["eu-central-1a", "eu-central-1b", "eu-central-1c"]
}
output "spot_price_current_max_mod" {
value = module.ec2_spot_price.spot_price_current_min
}
Result: 0.10

34. EC2 Spot Instances use cases

35. Thank you
Contacts:
● https://t.me/cageyv
● https://cageyv.dev/
● https://github.com/cageyv/
● https://www.linkedin.com/in/vladimirsamoylov
/
Useful links:
● https://github.com/fivexl/terraform-aws-ec2-
spot-price
● https://aws.amazon.com/ru/ec2/spot/instance-
advisor/
● https://ec2spotworkshops.com/
● https://github.com/awslabs/ec2-spot-labs/
● https://github.com/aws/aws-node-
termination-handler
● https://docs.aws.amazon.com/AmazonECS/late
st/developerguide/container-instance-
spot.html