Can not provide user-data to EKS managed node group with AMI used is a derivative of the AWS EKS Optimized AMI

[aenshin-pp]

Description

The documentation says that I can use pre_bootstrap_user_data but actually it is not used in template.

Versions

• Module version [Required]: 20.29.0

What is the proper way to pass user_data to EKS managed node group with AMI used is a derivative of the AWS EKS Optimized AMI in part of containerd config?

[bryantbiggs]

We won't be able to assist without a reproduction as requested per the issue template

[aenshin-pp]

@bryantbiggs here it is:

module "eks" {
  ...
  eks_managed_node_groups = {
    foo = {
      ...
      enable_bootstrap_user_data = true
      pre_bootstrap_user_data = "foo"

      min_size     = 2
      max_size     = 3
      desired_size = 2
      taints = {
        # This Taint aims to keep just EKS Addons and Karpenter running on this MNG
        # The pods that do not tolerate this taint should run on nodes created by Karpenter
        addons = {
          key    = "CriticalAddonsOnly"
          value  = "true"
          effect = "NO_SCHEDULE"
        },
      }
    }
  }

It is mostly taken from current module examples with adding the pre_bootstrap_user_data which has no effect despite doc mentioned it.

[bryantbiggs]

thats not a full reproduction - you cannot simply run terraform init && terraform apply -auto-approve

[aenshin-pp]

@bryantbiggs that is true. Let me show you easier example:

the template which is used to al2023 is here:
https://github.com/terraform-aws-modules/terraform-aws-eks/blob/master/templates/al2023_user_data.tpl

It doesn't render anything with name pre_bootstrap_user_data but documentation here:
https://github.com/terraform-aws-modules/terraform-aws-eks/blob/master/docs/user_data.md#eks-managed-node-group

says it is.

I think it should be enough?

[bryantbiggs]

pre_bootstrap_user_data is not used with AL2023 - AL2023 uses cloud-init with MIME multi-part file so that looks like this from the AL2023 example

pre_bootstrap_user_data is only applicable to AL2

[aenshin-pp]

pre_bootstrap_user_data is only applicable to AL2

then why doc says opposite?

The actual solution for AL2023 is to use cloudinit_pre_nodeadm as in example I guess?

Probably doc is not correct in that case.

[bryantbiggs]

my apologies for not having every iota of information kept up to date and accurate on this project that is provided to you for free

[aenshin-pp]

@bryantbiggs no problems. Just wanted to confirm and if it is so, it should be easy to fix?