Looping over map variable using for_each expression in terraform - iteration

Question

I have variable that I want to iterate over using for_each in terraform to create multiple instances of submodule - node_groups, which is part of eks module. This is my variable:
variable "frame_platform_eks_node_groups" {
type = map
default = {
eks_kube_system = {
desired_capacity = 1,
max_capacity = 5,
min_capacity = 1,
instance_type = ["m5.large"],
k8s_label = "eks_kube_system",
additional_tags = "eks_kube_system_node"
},
eks_jenkins_build = {
desired_capacity = 1,
max_capacity = 10,
min_capacity = 1,
instance_type = ["m5.large"],
k8s_label = "eks_jenkins_build",
additional_tags = "eks_jenkins_build_node"
}
}
}
And this is my node_groups submodule, which is part of module eks.
module "eks" {
...
node_groups = {
for_each = var.frame_platform_eks_node_groups
each.key = {
desired_capacity = each.value.desired_capacity
max_capacity = each.value.max_capacity
min_capacity = each.value.min_capacity
instance_types = each.value.instance_type
k8s_labels = {
Name = each.value.k8s_label
}
additional_tags = {
ExtraTag = each.value.additional_tags
}
}
When I run terraform plan I am getting following error:
15: each.key = {
If this expression is intended to be a reference, wrap it in parentheses. If
it’s instead intended as a literal name containing periods, wrap it in quotes
to create a string literal.
My intention obviously is to get eks_kube_system and eks_jenkins_build values from the map variable with each.key reference. But something is wrong. Do you have advice what I am doing wrong?
Thank you!

Answer 1

Its not exactly clear what node_groups is as it is not defined in your question, but assuming that it is a list of maps, then the code should be:
module "eks" {
...
node_groups = [
for k,v in var.frame_platform_eks_node_groups:
{
desired_capacity = v.desired_capacity
max_capacity = v.max_capacity
min_capacity = v.min_capacity
instance_types = v.instance_type
k8s_labels = {
Name = v.k8s_label
}
additional_tags = {
ExtraTag = v.additional_tags
}
}
]