Terraform-provider-aws: Add support for fargate capacity providers and spot capacity

[hsvallfors]

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Description

Fargate capacity providers is a new feature whereby you can set clusters and services to launch in EC2 spot capacity, enabling you to considerably cut costs by up to 70%.

New or Affected Resource(s)

• aws_ecs_cluster
• aws_ecs_service

Potential Terraform Configuration

resource "aws_ecs_cluster" "cluster" {
  name = "cluster"
  capacity_providers  = ["FARGATE", "FARGATE_SPOT"]
  default_capacity_provider_strategy {
      capacity_provider {
        name = "FARGATE"
        weight = 5
        base = 5
      }
      capacity_provider {
        name = "FARGATE_SPOT"
        weight = 1
        base = 5
     }
  }
}

resource "aws_ecs_service" "service" {
  name = "service"

  # Other parameters cut for brevity

 capacity_provider_strategy {
    capacity_provider {
      name = "FARGATE"
      weight = 5
      base = 5
    }
    capacity_provider {
      name = "FARGATE_SPOT"
      weight = 1
      base = 5
    }
  }
}

References

• https://aws.amazon.com/about-aws/whats-new/2019/12/aws-launches-fargate-spot-save-up-to-70-for-fault-tolerant-applications/
• https://docs.aws.amazon.com/AmazonECS/latest/developerguide/fargate-capacity-providers.html
• https://docs.aws.amazon.com/cli/latest/reference/ecs/create-cluster.html
• https://docs.aws.amazon.com/cli/latest/reference/ecs/create-service.html

[ryangardner]

When adding the capacity providers for the ecs_cluster, there is also the EC2 capacity provider which takes a name, the ARN of an auto-scaling group, and some parameters around the capacity.

I was about to post an issue to add support for the ec2 ecs cluster auto-scaling and saw this issue that was very similar to it. Should I open an issue for the EC2 auto scaling or would it be a good idea to add it to this one?

https://aws.amazon.com/blogs/aws/aws-ecs-cluster-auto-scaling-is-now-generally-available/

[kristiandrucker]

@bflad Hi Brian. I just saw that this has been released. Could I implement this Fargate and EC2 Capacity Provider configuration?

[kristiandrucker]

@ryangardner the EC2 and Fargate Capacity providers look the same except that you need a new resource to create a Capacity provider for EC2 (so it's assigned to an ASG and has some config) and from what I've found out the capacity provider for Spot is already pre-created for all AWS accounts. So there is that extra resource that EC2 requires otherwise it's the same

[skorfmann]

Seems related to https://github.com/terraform-providers/terraform-provider-aws/issues/11150

[hsvallfors]

Since there's already a pull request being worked on in https://github.com/terraform-providers/terraform-provider-aws/issues/11150 I'll close this to consolidate the discussion

[hashibot[bot]]

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