desired_size on eks node-group shouldn't be ignored during the lifecycle of an aws_eks_node_group

[DanMaxic]

terraform-aws-eks/modules/eks-managed-node-group/main.tf

Line 339 in ccc4747

ignore_changes = [

desired_size on eks node-group shouldn't be ignored during the lifecycle of an aws_eks_node_group

[bryantbiggs]

it is a deliberate design decision in order to support the predominant use of scaling services like cluster autoscaler, Karpenter, etc.

[llacoste]

This creates a problem if you are not using any form of autoscaling. For example, my cluster has 3, 6, and 9 for the values of min, desired, and max respectively. I am adjusting the terraform in order to double my clusters capacity. Now I am getting an error that the minimum cannot be larger than desired when using this module.

I believe as a workaround I can go and adjust the desired by hand in the console but that defeats the purpose of using terraform.

[bryantbiggs]

we cannot parameterize the lifecycle/ignore_changes block so unfortunately we have taken the direction to ignore desired size changes since this is how the vast majority of users utilize the module

[llacoste]

Perhaps there could be a different node group type? eks_managed_no_autoscaling_node_groups or something similar?

[bryantbiggs]

not in this module, no - we are doing everything we can currently to avoid any additional complexity overhead. the next breaking change at v19.x will actually remove the custom ASGs and launch templates so we can offload that to our https://github.com/terraform-aws-modules/terraform-aws-autoscaling module

[llacoste]

Okay, I'll wait to see what those changes entail. Thanks for the feedback.

[github-actions]

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[bryantbiggs]

https://github.com/bryantbiggs/eks-desired-size-hack