[Bug]: Error: ECS Task Definition container_definitions is invalid: decoding JSON: json: cannot unmarshal string into Go struct field PortMapping.PortMappings.ContainerPort of type int64

[PlusMinus0]

Terraform Core Version

1.9.3

AWS Provider Version

5.54.1

Affected Resource(s)

aws_ecs_task_definition

Expected Behavior

This configuration should work

  family             = var.service_name
  network_mode       = "awsvpc"
  execution_role_arn = var.execution_role_arn
  cpu                = 256
  memory             = 512
  container_definitions = jsonencode([
    {
      cpu         = 0
      environment = var.task_environment_variables
      mountPoints = []
      systemControls = []
      volumesFrom = []
      name        = var.service_name
      image       = var.environment == "DEV" ? replace(var.container_image, "/:.+$/", ":latest") : var.container_image
      repositoryCredentials = {
        credentialsParameter = var.repository_credentials_arn
      }
      essential   = true
      healthCheck = local.health_check_command == null ? null : {
        command  = local.health_check_command,
        interval = 30
        timeout  = 5
        retries  = 3
      }

      logConfiguration = {
        logDriver = "awslogs"
        options = {
          awslogs-group         = aws_cloudwatch_log_group.default.name
          awslogs-region        = var.region
          awslogs-stream-prefix = "ecs"
        }
      }
      portMappings = [
    {
      name          = lower(var.service_name)
      containerPort = var.service_port
      hostPort      = var.service_port
      protocol      = "tcp"
    }
  ]
    }
  ])
  requires_compatibilities = ["FARGATE"]
  runtime_platform {
    operating_system_family = "LINUX"
    cpu_architecture        = "X86_64"
  }
  # The following are set so terraform does not detect a diff when there is none (check if it worked)
  ipc_mode      = null
  pid_mode      = null
  tags = {}
  task_role_arn = ""
}

Actual Behavior

Once I add name to the port mapping, the run errors with:

Error: ECS Task Definition container_definitions is invalid: decoding JSON: json: cannot unmarshal string into Go struct field PortMapping.PortMappings.ContainerPort of type int64

It works without the name attribute.

Relevant Error/Panic Output Snippet

No response

Terraform Configuration Files

app.terraform.io

Steps to Reproduce

Add name to port mapping

Debug Output

No response

Panic Output

No response

Important Factoids

No response

References

No response

Would you like to implement a fix?

None

[github-actions]

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[justinretzolk]

Hey @PlusMinus0 👋 Thank you for taking the time to raise this! There were some other issues with this argument that were fixed with #38622, to be included in 5.61.0, which should be out later today. Can you test with this new version once it's out and let us know if the issue persists?

[PlusMinus0]

I'll check it tomorrow morning (CEST)

[PlusMinus0]

No luck, unfortunately. Now, on app.terraform.io I see another error message in the plan before the diagnostics:

Failed generating plan JSON
Exit code: 1

Failed to marshal plan to json: error marshaling prior state: schema version 0 for aws_ecs_service.default in state does not match version 1 from the provider
Operation failed: 2 errors occurred:

• failed running terraform plan (exit 1)
• failed generating plan JSON: failed running command (exit 1)

And the type in the previous error message changed from Int64 to Int32:

Error: ECS Task Definition container_definitions is invalid: json: cannot unmarshal string into Go struct field PortMapping.PortMappings.ContainerPort of type int32

If I remove the name field, everything still works as expected.