Session: eks-cluster-terraform-module — 2026-08-11

Project: infra-stack · Branch: feat/eks · Mode: default · Model: glm-4.6

Summary

Wrote a reusable Terraform module for an EKS cluster: private subnets, managed node groups with spot fallback, IRSA, and cluster add-ons pinned by version. terraform plan is clean in the staging workspace.

Conversation

Turn 1 — User

We need an EKS module we can reuse for staging and prod.

Turn 1 — Assistant

Module inputs: VPC id, subnet ids, node group sizes, spot/on-demand mix. IRSA enabled, add-ons (vpc-cni, coredns, kube-proxy) pinned. Outputs the kubeconfig data and OIDC provider ARN.

module "eks" {
  source          = "./modules/eks"
  cluster_name    = "staging"
  cluster_version = "1.33"
  subnet_ids      = module.vpc.private_subnets

  node_groups = {
    general = { instance_types = ["m7i.large"], min = 2, max = 6, capacity = "ON_DEMAND" }
    batch   = { instance_types = ["c7i.xlarge", "c6i.xlarge"], min = 0, max = 10, capacity = "SPOT" }
  }
}

Tools used in this turn:

• Write: modules/eks/main.tf
• Write: modules/eks/variables.tf
• Bash: terraform validate — Success
• Bash: terraform plan -var-file=staging.tfvars — 42 to add

Connections

• [[infra-stack]]
• [[Terraform]]
• [[EKS]]
• [[IRSA]]