Insufficient $instance capacity in Az

[zack-is-cool]

Persona

DU IaC Admin

Description

We should have terraform that's good enough to be able to work around these errors

Error: creating EC2 Instance: InsufficientInstanceCapacity: We currently do not have sufficient m5.xlarge capacity in the Availability Zone you requested (us-east-1a). Our system will be working on provisioning additional capacity. You can currently get m5.xlarge capacity by not specifying an Availability Zone in your request or choosing us-east-1b, us-east-1c, us-east-1d, us-east-1f.

With the error above, the Terraform isn't specifying an AZ

Use Case

Intermittently, these errors cause our pipelines to fail in anywhere this module is used (mostly in us-east-1 and in this repo )

Impact

Waste of time and money due to inability to merge branches due to failing pipeline

Completion

I see a few options here:

1. Move this to an Autoscaling group of 1, that way we can utilize mixed instance policies. (this might cost extra $$$ depending on the instance that gets provisioned)
2. Don't use us-east-1
3. Use aws_ec2_capacity_reservation (this costs extra $$$)

Additional Context

[zack-is-cool]

moving to next because we have a workaround for now - don't use us-east-1