Terraform: Cycle Error on 0.12.14 using blue green deployment

[Hobbit44]

Terraform Version

0.12.14

Terraform Configuration Files

resource "aws_autoscaling_group" "web" {
  name                 = "web-asg-${aws_launch_configuration.web.name}"
  availability_zones   = var.availablility_zones
  desired_capacity     = 1
  max_size             = 1
  min_size             = 1
  launch_configuration = aws_launch_configuration.web.name
  target_group_arns    = ["${aws_lb_target_group.web.arn}"]
  lifecycle {
    create_before_destroy = true
  }
}

resource "aws_autoscaling_policy" "web" {
  name                      = "Scale Group Size"
  policy_type               = "TargetTrackingScaling"
  cooldown                  = 0
  scaling_adjustment        = 0
  estimated_instance_warmup = 90
  autoscaling_group_name    = aws_autoscaling_group.web.name

  target_tracking_configuration {
    disable_scale_in = false
    target_value     = 70

    predefined_metric_specification {
        predefined_metric_type = "ASGAverageCPUUtilization"
    }
  }
}

resource "aws_launch_configuration" "web" {
  name_prefix          = "web-lc-"
  image_id             = data.aws_ami.web.id
  instance_type        = "t3a.medium"
  security_groups      = ["${aws_default_vpc.main.default_security_group_id}"]
  key_name             = "keyname"
  ebs_optimized        = false
  iam_instance_profile = "AppInstanceProfile"

  root_block_device {
     ...
  }

  lifecycle {
    create_before_destroy = true
  }
}

Expected Behavior

Creates a new autoscaling group with launch config and policy and attaches to the same load balancer

Actual Behavior

Produces a cycle error
Error: Cycle: aws_autoscaling_policy.web, aws_autoscaling_group.web, aws_autoscaling_group.web (destroy deposed c2bfe635), aws_launch_configuration.web (destroy deposed e45910f9)

Steps to Reproduce

Please list the full steps required to reproduce the issue, for example:

1. terraform init
2. terraform apply
3. change ami id
4. terraform apply

Graph showing cycle

produced with
terraform plan -out=tfplan && terraform graph -draw-cycles -type=apply tfplan | dot -Tsvg > graph.svg

May have something to do with the policy having a dependency on the launch configuration for some reason

[afterdesign]

I have the same error and dependency with aws_ecs_service and aws_ecs_task_definition.

[Hobbit44]

The problem seems to be based around how the dependencies are mapped when using create_before_destroy. The Cycle error goes away when i remove it but then i also lose blue-green deployments. Not a solution unfortunately as it incurs downtime.

[rene00]

Seeing this error with aws_launch_configuration and aws_autoscaling_group too on 0.12.14 and 0.12.15. Our temporary fix is to downgrade to 0.12.13.

[zhiguangwang]

Seeing this error with aws_launch_configuration and aws_autoscaling_group too on 0.12.14 and 0.12.15. Our temporary fix is to downgrade to 0.12.13.

Same here.

[katie-hemus]

Seeing this error with aws_launch_configuration and aws_autoscaling_group too on 0.12.14 and 0.12.15. Our temporary fix is to downgrade to 0.12.13.

Same here.

[tomaszdudek7]

I just hit the same issue. Any ETA on the fix?

[pkolyvas]

The team is working on a fix.

[hashibot[bot]]

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