id: T057
name: k8shost Resource Management
goal: Implement proper IP Address Management (IPAM) and tenant-aware scheduling for k8shost
status: complete
priority: P1
owner: peerB
created: 2025-12-12
depends_on: []
blocks: [T039]

context: |
  **Findings from T049 Audit:**
  - `k8shost/crates/k8shost-server/src/scheduler.rs`: `// TODO: Get list of active tenants from IAM or FlareDB`
  - `k8shost/crates/k8shost-server/src/services/service.rs`: `/// TODO: Implement proper IP allocation with IPAM`

  **Strategic Value:**
  - Essential for multi-tenant isolation and efficient resource utilization.
  - Required for Production Readiness (T039).

acceptance:
  - k8shost scheduler is tenant-aware (can prioritize/constrain pods by tenant)
  - Pluggable IPAM system implemented for Service IP allocation
  - IPAM integrates with PrismNET for IP assignment and management
  - Integration tests for tenant scheduling and IPAM

steps:
  - step: S1
    name: IPAM System Design & Spec
    done: Define IPAM system architecture and API (integration with PrismNET)
    status: complete
    started: 2025-12-12 18:30 JST
    completed: 2025-12-12 18:45 JST
    owner: peerA
    priority: P1
    outputs:
      - path: S1-ipam-spec.md
        note: IPAM system specification (250+ lines)
    notes: |
      Designed IPAM integration between k8shost and PrismNET:
      - ServiceIPPool resource for ClusterIP and LoadBalancer IPs
      - IpamService gRPC API in PrismNET
      - IpamClient for k8shost integration
      - Per-tenant IP pool isolation
      - ChainFire-backed storage for consistency
      - Backward compatible fallback to local counter

  - step: S2
    name: Service IP Allocation
    done: Implement IPAM integration for k8shost Service IPs
    status: complete
    started: 2025-12-12 20:03 JST
    completed: 2025-12-12 23:35 JST
    owner: peerB
    priority: P1
    outputs:
      - path: prismnet/crates/prismnet-server/src/services/ipam.rs
        note: IpamService gRPC implementation (310 LOC)
      - path: prismnet/crates/prismnet-server/src/metadata.rs
        note: IPAM metadata storage methods (+150 LOC)
      - path: k8shost/crates/k8shost-server/src/ipam_client.rs
        note: IpamClient gRPC wrapper (100 LOC)
    notes: |
      **Implementation Complete (1,030 LOC)**

      PrismNET IPAM (730 LOC):
      ✅ ServiceIPPool types with CIDR + HashSet allocation tracking
      ✅ IPAM proto definitions (6 RPCs: Create/Get/List pools, Allocate/Release/Get IPs)
      ✅ IpamService gRPC implementation with next-available-IP algorithm
      ✅ ChainFire metadata storage (6 methods)
      ✅ Registered in prismnet-server main.rs

      k8shost Integration (150 LOC):
      ✅ IpamClient gRPC wrapper
      ✅ ServiceServiceImpl updated to use IPAM (allocate on create, release on delete)
      ✅ PrismNetConfig added to k8shost config
      ✅ Tests updated

      Technical highlights:
      - Tenant isolation via (org_id, project_id) scoping
      - IPv4 CIDR enumeration (skips network/broadcast, starts at .10)
      - Auto-pool-selection by type (ClusterIp/LoadBalancer/NodePort)
      - Best-effort IP release on service deletion
      - ChainFire persistence with JSON serialization

  - step: S3
    name: Tenant-Aware Scheduler
    done: Modify scheduler to respect tenant constraints/priorities
    status: complete
    started: 2025-12-12 23:36 JST
    completed: 2025-12-12 23:45 JST
    owner: peerB
    priority: P1
    outputs:
      - path: k8shost/crates/k8shost-server/src/scheduler.rs
        note: Tenant-aware scheduler with quota enforcement (+150 LOC)
      - path: k8shost/crates/k8shost-server/src/storage.rs
        note: list_all_pods for tenant discovery (+35 LOC)
    notes: |
      **Implementation Complete (185 LOC)**

      ✅ CreditService client integration (CREDITSERVICE_ENDPOINT env var)
      ✅ Tenant discovery via pod query (get_active_tenants)
      ✅ Quota enforcement (check_quota_for_pod) before scheduling
      ✅ Resource cost calculation matching PodServiceImpl pattern
      ✅ Best-effort reliability (logs warnings, continues on errors)

      Architecture decisions:
      - Pragmatic tenant discovery: query pods for unique (org_id, project_id)
      - Best-effort quota: availability over strict consistency
      - Cost consistency: same formula as admission control

evidence:
  - item: S1 IPAM System Design
    desc: |
      Created IPAM integration specification:

      File: S1-ipam-spec.md (250+ lines)

      Key design decisions:
      - ServiceIPPool resource: Per-tenant IP pools for ClusterIP and LoadBalancer
      - IpamService gRPC: AllocateServiceIP, ReleaseServiceIP, GetIPAllocation
      - Storage: ChainFire-backed pools and allocations
      - Tenant isolation: Separate pools per org_id/project_id
      - Backward compat: Fallback to local counter if IPAM unavailable

      Architecture:
      - k8shost → IpamClient → PrismNET IpamService
      - PrismNET stores pools in /prismnet/ipam/pools/{org}/{proj}/{pool}
      - Allocations tracked in /prismnet/ipam/allocations/{org}/{proj}/{ip}

      Implementation phases:
      1. PrismNET IpamService (new gRPC service)
      2. k8shost IpamClient integration
      3. Default pool auto-provisioning
    files:
      - docs/por/T057-k8shost-resource-management/S1-ipam-spec.md
    timestamp: 2025-12-12 18:45 JST
notes: |
  Critical for multi-tenant and production deployments.