How to update launch configuration for existing autoscaling group in terraform

Question

I am trying to update an existing AWS autoscaling group (which is already created manually long back) with new Launch configuration using terraform.

provider "aws" {
access_key = <Access_key>
secret_key = <Secret_key>
region     = <REGION>

data "aws_autoscaling_groups" "asgpoc" {
 filter {
  name = "key"
  values = ["Name"]
 }

 filter {
  name = "value"
  values = ["asgpoc"]
 }
}
output "asgname" {
 value = "${data.aws_autoscaling_groups.asgpoc.names}"
}

resource "aws_autoscaling_group" "tf-dl-poc-asg" {
 availability_zones        = ["us-west-2"]
 name                      = "${data.aws_autoscaling_groups.asgpoc.names[0]}"
 max_size                  = 2
 min_size                  = 1
 health_check_grace_period = 300
 health_check_type         = "EC2"
 desired_capacity          = 1
 force_delete              = false
 launch_configuration      = "tf_dl_asg_lc"
}

when I do terraform apply, I am getting error,

aws_autoscaling_group.tf-dl-poc-asg: Error creating AutoScaling Group: AlreadyExists: AutoScalingGroup by this name already exists - A group with the name asgpoc already exists status code: 400, request id: ba011d22-2624-s1ea-ace8-fbc37028ec9c

How to solve this issue? Is there any alternate way to update existing AWS ASG with terraform?

BMW BMW · Accepted Answer · 2017-08-21T05:39:02

The resource you include with data "aws_autoscaling_groups" "asgpoc" is not under control by terraform.

You should import the exist resource first.

terraform import aws_autoscaling_group.tf-dl-poc-asg asgpoc

How to update launch configuration for existing autoscaling group in terraform

1 Answers