Placement constraints are not supported with FARGATE.

Summary

I was trying to add to existing ECS services a placement constraint. I applied this with no issues. I later tried to create a new service with this same placement constraint and got the below error. This issue corrupted my state file. I could not revert the existing ECS services, nor could I destroy them. To fix my state file I had to remove all ECS services from the state file, then manually delete the services outside of terraform and then recreate them to fix the state file.

placement_constraints {
    type       = "memberOf"
    expression = "attribute:ecs.availability-zone not_in [us-east-1e]" // use1-az3
 }

Because I had these issues it then tried to add the same constraint on the task definition and got another error. I was lucky this time it was on create, so it didn't mess up the state file.

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Terraform CLI and Terraform AWS Provider Version

Terraform v1.0.8
on darwin_arm64
+ provider registry.terraform.io/hashicorp/archive v2.2.0
+ provider registry.terraform.io/hashicorp/aws v4.25.0

Affected Resource(s)

aws_ecs_task_definition
aws_ecs_service

Terraform Configuration Files

Please include all Terraform configurations required to reproduce the bug. Bug reports without a functional reproduction may be closed without investigation.

# ECS Service
resource aws_ecs_service extract {
  launch_type = "FARGATE"
  platform_version = "LATEST"
  name            = local.extract_ecs_name
  cluster         = "arn:aws:ecs:us-east-1:${data.aws_caller_identity.this_caller.account_id}:cluster/${local.ecs_cluster_name}"
  task_definition = aws_ecs_task_definition.extract.arn
  desired_count   = var.extract_count
  deployment_minimum_healthy_percent = 0
  deployment_maximum_percent = 100

  propagate_tags = "SERVICE"

  deployment_controller {
    type = "ECS" # Rolling deployment (can only blue/green with Code Deploy)
  }

  network_configuration {
    subnets = var.subnets
    security_groups = ["sg-foobar"]
    assign_public_ip = true
  }
  tags = local.tags

###### this is issues
  placement_constraints {
    type       = "memberOf"
    expression = "attribute:ecs.availability-zone not_in [us-east-1e]" // use1-az3
 }
###### end issue

  lifecycle {
    ignore_changes = [
      task_definition,
      launch_type,
      platform_version,
      name,
      task_definition,
      desired_count,
      deployment_minimum_healthy_percent,
      deployment_maximum_percent,
      health_check_grace_period_seconds,
      deployment_controller
    ]
  }
}

Debug Output

Actual Behavior

ECS Service error.

│ Error: error creating ECS service (reso_tx_hris_sqs_joiner): InvalidParameterException: Placement constraints are not supported with FARGATE launch type.
│ 
│   with module.reso_ingest["tx_hris"].aws_ecs_service.joiner,
│   on ingest_module/ecs.tf line 180, in resource "aws_ecs_service" "joiner":
│  180: resource aws_ecs_service joiner {
│

ECS Task Definition error.

│ Error: failed creating ECS Task Definition (rets_recolorado_extract): ClientException: Fargate compatible task definitions do not support constraints
│
│   with module.rets_ingest[“recolorado”].aws_ecs_task_definition.extract,
│   on ingest_module/ecs.tf line 250, in resource “aws_ecs_task_definition” “extract”:
│  250: resource aws_ecs_task_definition extract {

Steps to Reproduce

ECS Service Issue.

Create a Fargate ECS service.
Once created add a placement constraint
After a constraint is added try to remove the constraint. This will really mess up your state file, and put in a very hard-to-correct state.

ECS Task Definition issue.

Create a task definition for ecs and include this, it will fail to create the task definition.

placement_constraints {
type       = "memberOf"
expression = "attribute:ecs.availability-zone not_in [us-east-1e]" // use1-az3
}

Important Factoids

I was able to check from the awscli the placement_constraint did exist in both cases (service, task).
This seems like 2 bugs but are related I feel so I am opening one issue.

hashicorp / terraform-provider-aws