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<main>
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<h1 id="adr-009-istio-service-mesh-para-kubernetes"><a class="header" href="#adr-009-istio-service-mesh-para-kubernetes">ADR-009: Istio Service Mesh para Kubernetes</a></h1>
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<p><strong>Status</strong>: Accepted | Implemented
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<strong>Date</strong>: 2024-11-01
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<strong>Deciders</strong>: Kubernetes Architecture Team
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<strong>Technical Story</strong>: Adding zero-trust security and traffic management for microservices in K8s</p>
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<hr />
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<h2 id="decision"><a class="header" href="#decision">Decision</a></h2>
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<p>Usar <strong>Istio</strong> como service mesh para mTLS, traffic management, rate limiting, y observability en Kubernetes.</p>
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<hr />
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<h2 id="rationale"><a class="header" href="#rationale">Rationale</a></h2>
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<ol>
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<li><strong>mTLS Out-of-Box</strong>: Automático TLS entre servicios sin código cambios</li>
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<li><strong>Zero-Trust</strong>: Enforced mutual TLS por defecto</li>
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<li><strong>Traffic Management</strong>: Circuit breakers, retries, timeouts sin lógica en aplicación</li>
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<li><strong>Observability</strong>: Tracing automático, metrics collection</li>
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<li><strong>VAPORA Multiservice</strong>: 4 deployments (backend, agents, LLM router, frontend) necesitan seguridad inter-service</li>
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</ol>
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<hr />
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<h2 id="alternatives-considered"><a class="header" href="#alternatives-considered">Alternatives Considered</a></h2>
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<h3 id="-plain-kubernetes-networking"><a class="header" href="#-plain-kubernetes-networking">❌ Plain Kubernetes Networking</a></h3>
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<ul>
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<li><strong>Pros</strong>: Simpler setup, fewer components</li>
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<li><strong>Cons</strong>: No mTLS, no traffic policies, manual observability</li>
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</ul>
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<h3 id="-linkerd-minimal-service-mesh"><a class="header" href="#-linkerd-minimal-service-mesh">❌ Linkerd (Minimal Service Mesh)</a></h3>
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<ul>
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<li><strong>Pros</strong>: Lighter weight than Istio</li>
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<li><strong>Cons</strong>: Less feature-rich, smaller ecosystem</li>
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</ul>
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<h3 id="-istio-chosen"><a class="header" href="#-istio-chosen">✅ Istio (CHOSEN)</a></h3>
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<ul>
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<li>Industry standard, feature-rich, VAPORA deployment compatible</li>
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</ul>
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<hr />
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<h2 id="trade-offs"><a class="header" href="#trade-offs">Trade-offs</a></h2>
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<p><strong>Pros</strong>:</p>
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<ul>
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<li>✅ Automatic mTLS between services</li>
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<li>✅ Declarative traffic policies (no code changes)</li>
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<li>✅ Circuit breakers and retries built-in</li>
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<li>✅ Integrated observability (tracing, metrics)</li>
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<li>✅ Gradual rollout support (canary deployments)</li>
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<li>✅ Rate limiting and authentication policies</li>
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</ul>
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<p><strong>Cons</strong>:</p>
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<ul>
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<li>⚠️ Operational complexity (data plane + control plane)</li>
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<li>⚠️ Memory overhead per pod (sidecar proxy)</li>
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<li>⚠️ Debugging complexity (multiple proxy layers)</li>
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<li>⚠️ Certification/certificate rotation management</li>
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</ul>
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<hr />
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<h2 id="implementation"><a class="header" href="#implementation">Implementation</a></h2>
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<p><strong>Installation</strong>:</p>
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<pre><code class="language-bash"># Install Istio
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istioctl install --set profile=production -y
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# Enable sidecar injection for namespace
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kubectl label namespace vapora istio-injection=enabled
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# Verify installation
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kubectl get pods -n istio-system
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</code></pre>
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<p><strong>Service Mesh Configuration</strong>:</p>
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<pre><code class="language-yaml"># kubernetes/platform/istio-config.yaml
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# Virtual Service for traffic policies
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apiVersion: networking.istio.io/v1beta1
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kind: VirtualService
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metadata:
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name: vapora-backend
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namespace: vapora
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spec:
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hosts:
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- vapora-backend
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http:
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- match:
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- uri:
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prefix: /api/health
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route:
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- destination:
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host: vapora-backend
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port:
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number: 8001
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timeout: 5s
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retries:
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attempts: 3
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perTryTimeout: 2s
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---
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# Destination Rule for circuit breaker
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apiVersion: networking.istio.io/v1beta1
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kind: DestinationRule
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metadata:
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name: vapora-backend
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namespace: vapora
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spec:
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host: vapora-backend
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trafficPolicy:
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connectionPool:
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tcp:
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maxConnections: 100
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http:
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http1MaxPendingRequests: 100
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http2MaxRequests: 1000
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outlierDetection:
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consecutive5xxErrors: 5
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interval: 30s
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baseEjectionTime: 30s
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---
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# Authorization Policy (deny all by default)
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apiVersion: security.istio.io/v1beta1
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kind: AuthorizationPolicy
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metadata:
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name: vapora-default-deny
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namespace: vapora
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spec:
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{} # Default deny-all
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---
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# Allow backend to agents
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apiVersion: security.istio.io/v1beta1
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kind: AuthorizationPolicy
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metadata:
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name: allow-backend-to-agents
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namespace: vapora
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spec:
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rules:
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- from:
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- source:
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principals: ["cluster.local/ns/vapora/sa/vapora-backend"]
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to:
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- operation:
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ports: ["8002"]
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</code></pre>
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||
|
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<p><strong>Key Files</strong>:</p>
|
||
|
|
<ul>
|
||
|
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<li><code>/kubernetes/platform/istio-config.yaml</code> (Istio configuration)</li>
|
||
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<li><code>/kubernetes/base/</code> (Deployment manifests with sidecar injection)</li>
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<li><code>istioctl</code> commands for traffic management</li>
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</ul>
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<hr />
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<h2 id="verification"><a class="header" href="#verification">Verification</a></h2>
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<pre><code class="language-bash"># Check sidecar injection
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kubectl get pods -n vapora -o jsonpath='{.items[*].spec.containers[*].name}' | grep istio-proxy
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# List virtual services
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||
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kubectl get virtualservices -n vapora
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# Check mTLS status
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||
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istioctl analyze -n vapora
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||
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# Monitor traffic between services
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||
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kubectl logs -n vapora deployment/vapora-backend -c istio-proxy --tail 20
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||
|
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|
||
|
|
# Test circuit breaker (should retry and fail gracefully)
|
||
|
|
kubectl exec -it deployment/vapora-backend -n vapora -- \
|
||
|
|
curl -v http://vapora-agents:8002/health -X GET \
|
||
|
|
--max-time 10
|
||
|
|
|
||
|
|
# Verify authorization policies
|
||
|
|
kubectl get authorizationpolicies -n vapora
|
||
|
|
|
||
|
|
# Check metrics collection
|
||
|
|
kubectl port-forward -n istio-system svc/prometheus 9090:9090
|
||
|
|
# Open http://localhost:9090 and query: rate(istio_request_total[1m])
|
||
|
|
</code></pre>
|
||
|
|
<p><strong>Expected Output</strong>:</p>
|
||
|
|
<ul>
|
||
|
|
<li>All pods have istio-proxy sidecar</li>
|
||
|
|
<li>VirtualServices and DestinationRules configured</li>
|
||
|
|
<li>mTLS enabled between services</li>
|
||
|
|
<li>Circuit breaker protects against cascading failures</li>
|
||
|
|
<li>Authorization policies enforce least-privilege access</li>
|
||
|
|
<li>Metrics collected for all inter-service traffic</li>
|
||
|
|
</ul>
|
||
|
|
<hr />
|
||
|
|
<h2 id="consequences"><a class="header" href="#consequences">Consequences</a></h2>
|
||
|
|
<h3 id="operational"><a class="header" href="#operational">Operational</a></h3>
|
||
|
|
<ul>
|
||
|
|
<li>Certificate rotation automatic (Istio CA)</li>
|
||
|
|
<li>Service-to-service debugging requires understanding proxy layers</li>
|
||
|
|
<li>Traffic policies applied without code redeployment</li>
|
||
|
|
</ul>
|
||
|
|
<h3 id="performance"><a class="header" href="#performance">Performance</a></h3>
|
||
|
|
<ul>
|
||
|
|
<li>Sidecar proxy adds ~5-10ms latency per call</li>
|
||
|
|
<li>Memory per pod: +50MB for proxy container</li>
|
||
|
|
<li>Worth the security/observability trade-off</li>
|
||
|
|
</ul>
|
||
|
|
<h3 id="debugging"><a class="header" href="#debugging">Debugging</a></h3>
|
||
|
|
<ul>
|
||
|
|
<li>Use <code>istioctl analyze</code> to diagnose issues</li>
|
||
|
|
<li>Envoy proxy logs in sidecar containers</li>
|
||
|
|
<li>Distributed tracing via Jaeger/Zipkin integration</li>
|
||
|
|
</ul>
|
||
|
|
<h3 id="scaling"><a class="header" href="#scaling">Scaling</a></h3>
|
||
|
|
<ul>
|
||
|
|
<li>Automatic load balancing via DestinationRule</li>
|
||
|
|
<li>Circuit breaker prevents thundering herd</li>
|
||
|
|
<li>Support for canary rollouts via traffic splitting</li>
|
||
|
|
</ul>
|
||
|
|
<hr />
|
||
|
|
<h2 id="references"><a class="header" href="#references">References</a></h2>
|
||
|
|
<ul>
|
||
|
|
<li><a href="https://istio.io/latest/docs/">Istio Documentation</a></li>
|
||
|
|
<li><a href="https://istio.io/latest/docs/concepts/security/">Istio Security</a></li>
|
||
|
|
<li><code>/kubernetes/platform/istio-config.yaml</code> (configuration)</li>
|
||
|
|
<li><a href="https://istio.io/latest/docs/ops/integrations/prometheus/">Prometheus Integration</a></li>
|
||
|
|
</ul>
|
||
|
|
<hr />
|
||
|
|
<p><strong>Related ADRs</strong>: ADR-001 (Workspace), ADR-010 (Cedar Authorization)</p>
|
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