LT User Data Update Requires Two Applies to Update ASG

[stewartcampbell]

Description

When I make a change to EC2 userdata, the first plan/apply only updates the LT. I need a second plan/apply to update the ASG. Is this expected? Thanks.

Versions

Terraform v1.0.11 on linux_amd64

• provider registry.terraform.io/hashicorp/aws v3.69.0

Code Snippet to Reproduce

locals {
  user_data = <<-EOT
  #!/bin/bash -xe
  ...

...
  update_default_version = true
  use_lt                 = true
  user_data_base64       = base64encode(local.user_data)
  vpc_zone_identifier    = var.private_subnet_ids
}

Expected behavior

ASG updates at the same time as LT.

Actual behavior

Requires two updates.

[bryantbiggs]

hi @stewartcampbell - this is because of using the default version and updating the default version. the rough sequence of steps are as follows: 1) Change is detected on LT and therefore version should be updated 2) Default version is now one version behind, update default version

If you want to avoid this, I believe you should be able to set lt_version = "$Latest" and this will update in one apply (its been a minute but I believe this is the correct route to achieve your outcome). Try it out and let me know

[stewartcampbell]

Hi @bryantbiggs. Thanks for the response.

100% works. I totally forgot you could set the version to latest for an ASG LT :)

Thanks again.

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