mock outputs in Terragrunt dependency - kubernetes

Question

I want to use Terragrunt to deploy this example: https://github.com/aws-ia/terraform-aws-eks-blueprints/blob/main/examples/complete-kubernetes-addons/main.tf
So far, I was able to create the VPC/EKS resource without a problem, I separated each module into a different module directory, and everything worked as expected.
When I tried to do the same for the Kubernetes-addons module, I faced an issue with the data source trying to call to the cluster and failing since the cluster wasn't created at this point.
Here's my terragrunt.hcl which I'm trying to execute for this specific module:
...
terraform {
source = "git::git#github.com:aws-ia/terraform-aws-eks-blueprints.git//modules/kubernetes-addons?ref=v4.6.1"
}
locals {
# Extract needed variables for reuse
cluster_version = "${include.envcommon.locals.cluster_version}"
name = "${include.envcommon.locals.name}"
}
dependency "eks" {
config_path = "../eks"
mock_outputs = {
eks_cluster_endpoint = "https://000000000000.gr7.eu-west-3.eks.amazonaws.com"
eks_oidc_provider = "something"
eks_cluster_id = "something"
}
}
inputs = {
eks_cluster_id = dependency.eks.outputs.cluster_id
eks_cluster_endpoint = dependency.eks.outputs.eks_cluster_endpoint
eks_oidc_provider = dependency.eks.outputs.eks_oidc_provider
eks_cluster_version = local.cluster_version
...
}
The error that I'm getting here:
`
INFO[0035]
Error: error reading EKS Cluster (something): couldn't find resource
with data.aws_eks_cluster.eks_cluster,
on data.tf line 7, in data "aws_eks_cluster" "eks_cluster":
7: data "aws_eks_cluster" "eks_cluster" {
`

Answer 1

The kubernetes-addons module is deploying addons into an existing Kubernetes cluster. If you don't have a cluster running (apparently you don't have one when you're mocking the cluster_id variable), then you get the error of not having the aws_eks_cluster data source.
You need to create the K8s cluster first, before you can start deploying the addons.