fix: Fixed launch_templates_with_managed_node_group example

[PascalBourdier]

remove instance_type in aws_launch_template.default to avoid this error:

│ Error: error creating EKS Node Group (test-eks-lt-URZJOIL1:test-eks-lt-URZJOIL1-example2021092307395969650000000f): InvalidRequestException: Cannot specify instance types in launch template and API request
│ {
│   RespMetadata: {
│     StatusCode: 400,
│     RequestID: "bece44af-e7e0-4931-9725-4fb57a7de031"
│   },
│   ClusterName: "test-eks-lt-URZJOIL1",
│   Message_: "Cannot specify instance types in launch template and API request",
│   NodegroupName: "test-eks-lt-URZJOIL1-example2021092307395969650000000f"
│ }
│
│   with module.eks.module.node_groups.aws_eks_node_group.workers["example"],
│   on ../../modules/node_groups/main.tf line 1, in resource "aws_eks_node_group" "workers":
│    1: resource "aws_eks_node_group" "workers" {

replace it by instance_types in node_groups block of module.eks

add a custom_suffix in aws_iam_service_linked_role.autoscaling to avoid conflict like:

│ Error: Error creating service-linked role with name autoscaling.amazonaws.com: InvalidInput: Service role name AWSServiceRoleForAutoScaling has been taken in this account, please try a different suffix.
│     status code: 400, request id: e4ad4c1e-ad6e-4544-bed5-f3beeb148d29
│
│   with aws_iam_service_linked_role.autoscaling,
│   on disk_encryption_policy.tf line 2, in resource "aws_iam_service_linked_role" "autoscaling":
│    2: resource "aws_iam_service_linked_role" "autoscaling" {

PR o'clock

Description

Please explain the changes you made here and link to any relevant issues.

Checklist

• README.md has been updated after any changes to variables and outputs. See https:/terraform-aws-modules/terraform-aws-eks/#doc-generation

[daroga0002]

@PascalBourdier thank you for your contribution 🎉

@antonbabenko I have tested so this can be merged, I dont think here we need make a release as examples will be updated over master. I will try to review few more PRs and then we can consolidate few smaller PRs into release

[antonbabenko]

@daroga0002 I agree, we can merge multiple PRs and release once. Let me know when you think you are done reviewing them.

[iyenigul]

@antonbabenko @PascalBourdier
The following resource at https:/terraform-aws-modules/terraform-aws-eks/blob/master/examples/launch_templates_with_managed_node_groups/disk_encryption_policy.tf#L2
is always re-created when I apply terraform apply (terraform 1.0)

 resource "aws_iam_service_linked_role" "autoscaling" {
    aws_service_name = "autoscaling.amazonaws.com"
    description      = "Default Service-Linked Role enables access to AWS Services and Resources used or managed by Auto Scaling"
     custom_suffix    = "lt_with_managed_node_groups" # the full name is "AWSServiceRoleForAutoScaling_lt_with_managed_node_groups" < 64 characters
   } 

see the result.

Terraform used the selected providers to generate the following execution plan. Resource actions are indicated with the following symbols:
-/+ destroy and then create replacement

Terraform will perform the following actions:

  # aws_iam_service_linked_role.autoscaling must be replaced
-/+ resource "aws_iam_service_linked_role" "autoscaling" {
      ~ arn              = "arn:aws:iam::id:role/aws-service-role/autoscaling.amazonaws.com/AWSServiceRoleForAutoScaling_lt_with_managed_node_groups" -> (known after apply)
      ~ create_date      = "2021-10-04T19:33:58Z" -> (known after apply)
      + custom_suffix    = "lt_with_managed_node_groups" # forces replacement
      ~ id               = "arn:aws:iam::id:role/aws-service-role/autoscaling.amazonaws.com/AWSServiceRoleForAutoScaling_lt_with_managed_node_groups" -> (known after apply)
      ~ name             = "AWSServiceRoleForAutoScaling_lt_with_managed_node_groups" -> (known after apply)
      ~ path             = "/aws-service-role/autoscaling.amazonaws.com/" -> (known after apply)
      ~ unique_id        = "AROATPZ442RUJ3BUOZH6F" -> (known after apply)
        # (2 unchanged attributes hidden)
    }

Plan: 1 to add, 0 to change, 1 to destroy.

Do you want to perform these actions?
  Terraform will perform the actions described above.
  Only 'yes' will be accepted to approve.

  Enter a value: yes

aws_iam_service_linked_role.autoscaling: Destroying... [id=arn:aws:iam::id:role/aws-service-role/autoscaling.amazonaws.com/AWSServiceRoleForAutoScaling_lt_with_managed_node_groups]
aws_iam_service_linked_role.autoscaling: Still destroying... [id=arn:aws:iam::id:role/aws-serv...utoScaling_lt_with_managed_node_groups, 10s elapsed]
aws_iam_service_linked_role.autoscaling: Destruction complete after 12s
aws_iam_service_linked_role.autoscaling: Creating...
aws_iam_service_linked_role.autoscaling: Creation complete after 1s [id=arn:aws:iam::id:role/aws-service-role/autoscaling.amazonaws.com/AWSServiceRoleForAutoScaling_lt_with_managed_node_groups]
Releasing state lock. This may take a few moments...

But it works fine if I remove custom_suffix or If I add

 lifecycle {
    ignore_changes = ["custom_suffix"]
  }

[github-actions]

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