GistPin/infrastructure/k8s/istio/destination-rules.yaml at fix/gitignore-encoding · ghzhost/GistPin · GitHub

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---
# ──────────────────────────────────────────────────────────────────────────────
# GistPin — Destination Rules
#
# Configures:
#   - Load balancing algorithm per service
#   - Connection pool limits (circuit breaker)
#   - Outlier detection (automatic pod ejection)
#   - Subsets (stable / canary) matching pod labels
#   - TLS mode for mTLS between sidecars
# ──────────────────────────────────────────────────────────────────────────────

# ── Backend API ───────────────────────────────────────────────────────────────
apiVersion: networking.istio.io/v1alpha3
kind: DestinationRule
metadata:
  name: backend
  namespace: gistpin
spec:
  host: backend
  trafficPolicy:
    loadBalancer:
      # LEAST_CONN distributes to the pod with fewest active connections;
      # better than ROUND_ROBIN for variable-latency API handlers.
      simple: LEAST_CONN

    connectionPool:
      tcp:
        maxConnections: 100
        connectTimeout: 5s
        tcpKeepalive:
          time: 7200s
          interval: 75s
      http:
        http1MaxPendingRequests: 64
        http2MaxRequests: 1000
        maxRequestsPerConnection: 10
        maxRetries: 3

    outlierDetection:
      # Eject pods returning 5xx errors for increasing intervals
      consecutiveGatewayErrors: 5
      consecutive5xxErrors: 5
      interval: 30s
      baseEjectionTime: 30s
      maxEjectionPercent: 50
      minHealthPercent: 30

    tls:
      mode: ISTIO_MUTUAL    # Enforce mTLS; pairs with PeerAuthentication STRICT

  subsets:
    - name: stable
      labels:
        version: stable
      trafficPolicy:
        loadBalancer:
          simple: LEAST_CONN

    - name: canary
      labels:
        version: canary
      trafficPolicy:
        loadBalancer:
          # During canary, use RANDOM to spread across a small pod set
          simple: RANDOM

---
# ── Frontend ──────────────────────────────────────────────────────────────────
apiVersion: networking.istio.io/v1alpha3
kind: DestinationRule
metadata:
  name: frontend
  namespace: gistpin
spec:
  host: frontend
  trafficPolicy:
    loadBalancer:
      simple: ROUND_ROBIN   # Stateless SSR; round-robin is fine

    connectionPool:
      tcp:
        maxConnections: 50
        connectTimeout: 3s
      http:
        http1MaxPendingRequests: 32
        http2MaxRequests: 500
        maxRequestsPerConnection: 0   # Keep-alive

    outlierDetection:
      consecutiveGatewayErrors: 5
      interval: 30s
      baseEjectionTime: 15s
      maxEjectionPercent: 30

    tls:
      mode: ISTIO_MUTUAL

  subsets:
    - name: stable
      labels:
        version: stable

    - name: canary
      labels:
        version: canary

---
# ── Analytics ─────────────────────────────────────────────────────────────────
apiVersion: networking.istio.io/v1alpha3
kind: DestinationRule
metadata:
  name: analytics
  namespace: gistpin
spec:
  host: analytics
  trafficPolicy:
    loadBalancer:
      # LEAST_CONN suits the mixed workload (fast ingest + slow queries)
      simple: LEAST_CONN

    connectionPool:
      tcp:
        maxConnections: 200
        connectTimeout: 5s
      http:
        http1MaxPendingRequests: 128
        http2MaxRequests: 2000
        maxRequestsPerConnection: 0

    outlierDetection:
      consecutiveGatewayErrors: 10
      interval: 60s
      baseEjectionTime: 60s
      maxEjectionPercent: 25

    tls:
      mode: ISTIO_MUTUAL

  subsets:
    - name: stable
      labels:
        version: stable

---
# ── Istio Egress Gateway ──────────────────────────────────────────────────────
# TLS origination for HTTPS egress to Stellar endpoints.
apiVersion: networking.istio.io/v1alpha3
kind: DestinationRule
metadata:
  name: stellar-rpc-egress-tls
  namespace: gistpin
spec:
  host: istio-egressgateway.istio-system.svc.cluster.local
  trafficPolicy:
    loadBalancer:
      simple: ROUND_ROBIN
    portLevelSettings:
      - port:
          number: 443
        tls:
          mode: ISTIO_MUTUAL

---
# ── ServiceEntry — allow mesh egress to Stellar RPC hosts ────────────────────
apiVersion: networking.istio.io/v1alpha3
kind: ServiceEntry
metadata:
  name: stellar-rpc
  namespace: gistpin
spec:
  hosts:
    - horizon.stellar.org
    - soroban-testnet.stellar.org
  ports:
    - number: 443
      name: https
      protocol: HTTPS
    - number: 80
      name: http
      protocol: HTTP
  location: MESH_EXTERNAL
  resolution: DNS