aws_ecs_cluster: Update data source to export attribute for defaultCapacityProviderStrategy

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Description

Update the existing Data Source aws_ecs_cluster to also export an attribute for the defaultCapacityProviderStrategy, which is available via the DescribeClusters API

Use Case - when migrating ECS Clusters to use AWS Capacity Providers feature, we need to also migrate our existing ECS Services on that cluster. (New ECS Services automatically get this default strategy, but existing ones do not). In our case, our cluster resources are defined in different CI/CD pipelines than the ECS Services. If we could have Services query for any default strategy then use that, it would help with the migration process.

A workaround would be to use an External data source with AWS CLI commands to obtain this info, or to write out this metadata to TF state for querying via terraform_remote_state lookups.

New or Affected Resource(s)

aws_ecs_cluster

Potential Terraform Configuration


data "aws_ecs_cluster" "example" {
  cluster_name = "example"
}

resource "aws_ecs_service" "myservice" {
  ...
  # better alternative implementation would be to use a dynamic block to loop through each of the items in the array. This is simplified
    capacity_provider_strategy {
      capacity_provider = data.aws_ecs_cluster.example.default_capacity_provider_strategy[0].capacity_provider
      weight            = data.aws_ecs_cluster.example.default_capacity_provider_strategy[0].weight
      base              = data.aws_ecs_cluster.example.default_capacity_provider_strategy[0].base
  } 
}

References

0000

hashicorp / terraform-provider-aws