# Karpenter NodePool Configuration
# RFC 0039: ADR-Compliant Foundation Infrastructure
# ADR 0004: "Set It and Forget It" Auto-Scaling Architecture
#
# This NodePool enables automatic scaling from 0 to 100 vCPUs
# using spot instances for cost optimization.
---
apiVersion: karpenter.sh/v1beta1
kind: NodePool
metadata:
  name: default
spec:
  template:
    metadata:
      labels:
        node-type: general
    spec:
      requirements:
        # Use spot instances for cost optimization
        - key: karpenter.sh/capacity-type
          operator: In
          values: ["spot", "on-demand"]
        # Instance types optimized for general workloads
        - key: node.kubernetes.io/instance-type
          operator: In
          values:
            - m6i.large
            - m6i.xlarge
            - m6i.2xlarge
            - m5.large
            - m5.xlarge
            - m5.2xlarge
            - c6i.large
            - c6i.xlarge
            - c6i.2xlarge
        # AMD64 required for FIPS compliance
        - key: kubernetes.io/arch
          operator: In
          values: ["amd64"]
        # Multi-AZ for high availability
        - key: topology.kubernetes.io/zone
          operator: In
          values:
            - us-east-1a
            - us-east-1b
            - us-east-1c
      nodeClassRef:
        name: default
  # Limit total cluster compute (ADR 0004: auto-scale to this limit)
  limits:
    cpu: 100
    memory: 200Gi
  # Scale down aggressively when idle (ADR 0004: near-zero cost when idle)
  disruption:
    consolidationPolicy: WhenEmpty
    consolidateAfter: 30s
    budgets:
      - nodes: "10%"
---
apiVersion: karpenter.sh/v1beta1
kind: NodePool
metadata:
  name: cockroachdb
spec:
  template:
    metadata:
      labels:
        node-type: database
        workload: cockroachdb
    spec:
      requirements:
        # On-demand for database stability
        - key: karpenter.sh/capacity-type
          operator: In
          values: ["on-demand"]
        # Database-optimized instances
        - key: node.kubernetes.io/instance-type
          operator: In
          values:
            - m6i.large
            - m6i.xlarge
            - m6i.2xlarge
        # AMD64 required for FIPS
        - key: kubernetes.io/arch
          operator: In
          values: ["amd64"]
        # Spread across AZs
        - key: topology.kubernetes.io/zone
          operator: In
          values:
            - us-east-1a
            - us-east-1b
            - us-east-1c
      taints:
        - key: workload
          value: cockroachdb
          effect: NoSchedule
      nodeClassRef:
        name: default
  limits:
    cpu: 18  # 3 nodes x 6 vCPU max (m6i.xlarge)
    memory: 72Gi  # 3 nodes x 24GB max
  disruption:
    consolidationPolicy: WhenEmpty
    consolidateAfter: 24h  # Don't disrupt database nodes quickly
    budgets:
      - nodes: "0"  # Never disrupt database nodes automatically