CDE Capacity Planning

# Terraform - EKS Managed Node Groups (2026)

module "eks" {
  source  = "terraform-aws-modules/eks/aws"
  version = "~> 20.0"

  cluster_name    = "cde-cluster"
  cluster_version = "1.31"

  eks_managed_node_groups = {
    # Control plane nodes - always on
    control-plane = {
      name           = "control-plane"
      instance_types = ["m7i.xlarge"]
      min_size       = 3
      max_size       = 3
      desired_size   = 3

      labels = {
        role = "control-plane"
      }

      taints = [{
        key    = "CriticalAddonsOnly"
        value  = "true"
        effect = "NO_SCHEDULE"
      }]
    }

    # Standard workspace nodes - auto-scaling
    workspace-standard = {
      name           = "workspace-standard"
      instance_types = ["m7i.2xlarge"]
      min_size       = 2
      max_size       = 20
      desired_size   = 5

      labels = {
        role     = "workspace"
        workload = "standard"
      }
    }

    # AI agent workspace nodes - high scale limit
    workspace-agent = {
      name           = "workspace-agent"
      instance_types = ["m7i.2xlarge"]
      min_size       = 0
      max_size       = 50
      desired_size   = 0

      labels = {
        role     = "workspace"
        workload = "agent"
      }

      taints = [{
        key    = "agent-only"
        value  = "true"
        effect = "NO_SCHEDULE"
      }]
    }

    # Spot instances for cost savings + agent overflow
    workspace-spot = {
      name           = "workspace-spot"
      instance_types = ["m7i.2xlarge", "m7a.2xlarge", "m6i.2xlarge"]
      capacity_type  = "SPOT"
      min_size       = 0
      max_size       = 30
      desired_size   = 0

      labels = {
        role     = "workspace"
        workload = "spot"
      }

      taints = [{
        key    = "spot"
        value  = "true"
        effect = "NO_SCHEDULE"
      }]
    }

    # GPU nodes for LLM inference and ML workloads
    workspace-gpu = {
      name           = "workspace-gpu"
      instance_types = ["g6.2xlarge"]
      min_size       = 0
      max_size       = 10
      desired_size   = 0

      ami_type = "AL2023_x86_64_GPU"

      labels = {
        role     = "workspace"
        workload = "gpu"
        "nvidia.com/gpu" = "true"
      }

      taints = [{
        key    = "nvidia.com/gpu"
        value  = "true"
        effect = "NO_SCHEDULE"
      }]
    }
  }
}