Add an option for using AWS spot instances

[burakkaraceylan]

Context

Current AWS cloud formation only uses on-demand Fargate instances.
Spot instances are a lot cheaper, albeit they are interruptable.
However, not every build task is mission critical.

Suggested solution

An option can be added to the action.yaml for using spot instances.
Instead of launch type Fargate, capacity providers option can be used to utilize spot instances.
A retry strategy can be put in place for interrupted tasks.

[webbertakken]

Interesting. Do we know the mean time between interruptions?

@frostebite do you think it's worth considering adding an option for this?

[burakkaraceylan]

It depends on the demand. AWS provides statistics for EC2 instances here. Frequency of interruption ranges from 5% to 20% depending on the instance type. I can't find any info related to Fargate Spot though.

However the API sends a notice 2 minutes before the interruption. More information here.

[frostebite]

Thanks for sharing this feedback. I will review the options in-depth and share some thoughts with you.

…

On Thu, Nov 13, 2025 at 12:04 PM burakkaraceylan ***@***.***> wrote: *burakkaraceylan* left a comment (game-ci/unity-builder#761) <#761 (comment)> It depends on the demand. AWS provides statistics for EC2 instances here <https://aws.amazon.com/tr/ec2/spot/instance-advisor/>. It ranges from 5% to 20% depending on the instance type. I can't find any info related to Fargate Spot though. However the API sends a notice 2 minutes before the interruption. More information here <https://aws.amazon.com/tr/blogs/compute/deep-dive-into-fargate-spot-to-run-your-ecs-tasks-for-up-to-70-less/> . — Reply to this email directly, view it on GitHub <#761 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AANLQGGDNSXINCYFY4GEMWL34RXULAVCNFSM6AAAAACL3ENWPOVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZTKMRXGQ4TSNBRHE> . You are receiving this because you were mentioned.Message ID: ***@***.***>