# istio-setup.yaml
apiVersion: v1
kind: Namespace
metadata:
  name: istio-system
  labels:
    istio-injection: enabled
 
---
apiVersion: install.istio.io/v1alpha1
kind: IstioOperator
metadata:
  name: istio-config
  namespace: istio-system
spec:
  profile: production
  revision: "1-13"
 
  components:
    pilot:
      k8s:
        resources:
          requests:
            cpu: 500m
            memory: 2048Mi
          limits:
            cpu: 2000m
            memory: 4096Mi
        replicaCount: 3
 
    ingressGateways:
      - name: istio-ingressgateway
        enabled: true
        k8s:
          resources:
            requests:
              cpu: 100m
              memory: 128Mi
            limits:
              cpu: 2000m
              memory: 1024Mi
          service:
            type: LoadBalancer
            ports:
              - port: 80
                targetPort: 8080
                name: http2
              - port: 443
                targetPort: 8443
                name: https
 
    egressGateways:
      - name: istio-egressgateway
        enabled: true
 
  meshConfig:
    enableAutoMTLS: true
    outboundTrafficPolicy:
      mode: ALLOW_ANY
 
    accessLogFile: /dev/stdout
    accessLogFormat: |
      [%START_TIME%] "%REQ(:METHOD)% %REQ(X-ENVOY-ORIGINAL-PATH?:PATH)% %PROTOCOL%"
      %RESPONSE_CODE% %RESPONSE_FLAGS% %BYTES_RECEIVED% %BYTES_SENT%
      "%DURATION%" "%RESP(X-ENVOY-UPSTREAM-SERVICE-TIME)%"
 
---
# Enable sidecar injection for namespace
apiVersion: v1
kind: Namespace
metadata:
  name: production
  labels:
    istio-injection: enabled

# virtual-service-config.yaml
apiVersion: networking.istio.io/v1beta1
kind: VirtualService
metadata:
  name: api-service
  namespace: production
spec:
  hosts:
    - api-service
    - api-service.production.svc.cluster.local
  http:
    # Canary: 10% to v2, 90% to v1
    - match:
        - uri:
            prefix: /api/v1
      route:
        - destination:
            host: api-service
            subset: v1
          weight: 90
        - destination:
            host: api-service
            subset: v2
          weight: 10
      timeout: 30s
      retries:
        attempts: 3
        perTryTimeout: 10s
 
    # API v2 for testing
    - match:
        - headers:
            user-agent:
              regex: ".*Chrome.*"
      route:
        - destination:
            host: api-service
            subset: v2
      timeout: 30s
 
    # Default route
    - route:
        - destination:
            host: api-service
            subset: v1
          weight: 100
      timeout: 30s
      retries:
        attempts: 3
        perTryTimeout: 10s
 
---
apiVersion: networking.istio.io/v1beta1
kind: DestinationRule
metadata:
  name: api-service
  namespace: production
spec:
  host: api-service
  trafficPolicy:
    connectionPool:
      tcp:
        maxConnections: 100
      http:
        http1MaxPendingRequests: 100
        maxRequestsPerConnection: 2
        h2UpgradePolicy: UPGRADE
 
    outlierDetection:
      consecutive5xxErrors: 5
      interval: 30s
      baseEjectionTime: 30s
      maxEjectionPercent: 50
      minRequestVolume: 10
 
  subsets:
    - name: v1
      labels:
        version: v1
      trafficPolicy:
        connectionPool:
          http:
            http1MaxPendingRequests: 50
 
    - name: v2
      labels:
        version: v2
      trafficPolicy:
        connectionPool:
          http:
            http1MaxPendingRequests: 100

# security-config.yaml
apiVersion: security.istio.io/v1beta1
kind: PeerAuthentication
metadata:
  name: default
  namespace: istio-system
spec:
  mtls:
    mode: STRICT  # Enforce mTLS for all workloads
 
---
apiVersion: security.istio.io/v1beta1
kind: AuthorizationPolicy
metadata:
  name: api-service-authz
  namespace: production
spec:
  selector:
    matchLabels:
      app: api-service
  action: ALLOW
  rules:
    - from:
        - source:
            principals: ["cluster.local/ns/production/sa/web-service"]
      to:
        - operation:
            methods: ["GET", "POST"]
            paths: ["/api/v1/*"]
 
    # Allow health checks
    - to:
        - operation:
            methods: ["GET"]
            paths: ["/health"]
 
---
apiVersion: security.istio.io/v1beta1
kind: RequestAuthentication
metadata:
  name: api-service-authn
  namespace: production
spec:
  selector:
    matchLabels:
      app: api-service
  jwtRules:
    - issuer: https://auth.mycompany.com
      jwksUri: https://auth.mycompany.com/.well-known/jwks.json
      audiences: api-service

# observability-config.yaml
apiVersion: telemetry.istio.io/v1alpha1
kind: Telemetry
metadata:
  name: custom-logging
  namespace: production
spec:
  metrics:
    - providers:
        - name: prometheus
      dimensions:
        - request.path
        - response.code
        - destination.service.name
 
---
apiVersion: telemetry.istio.io/v1alpha1
kind: Telemetry
metadata:
  name: custom-tracing
  namespace: production
spec:
  tracing:
    - providers:
        - name: jaeger
      randomSamplingPercentage: 100.0
      useRequestIdForTraceSampling: true
 
---
# Grafana Dashboard ConfigMap
apiVersion: v1
kind: ConfigMap
metadata:
  name: istio-dashboard
  namespace: monitoring
data:
  istio-mesh.json: |
    {
      "dashboard": {
        "title": "Istio Mesh",
        "panels": [
          {
            "title": "Request Rate",
            "targets": [
              {
                "expr": "rate(istio_requests_total[5m])"
              }
            ]
          },
          {
            "title": "Error Rate",
            "targets": [
              {
                "expr": "rate(istio_requests_total{response_code=~\"5..\"}[5m])"
              }
            ]
          },
          {
            "title": "Latency P95",
            "targets": [
              {
                "expr": "histogram_quantile(0.95, rate(istio_request_duration_milliseconds_bucket[5m]))"
              }
            ]
          }
        ]
      }
    }

#!/bin/bash
# deploy-istio.sh - Install and configure Istio
 
set -euo pipefail
 
VERSION="1.13.0"
NAMESPACE="istio-system"
 
echo "Installing Istio $VERSION..."
 
# Download Istio
if [ ! -d "istio-$VERSION" ]; then
    echo "Downloading Istio..."
    curl -L https://istio.io/downloadIstio | ISTIO_VERSION=$VERSION sh -
fi
 
cd "istio-$VERSION"
 
# Add istioctl to PATH
export PATH=$PWD/bin:$PATH
 
# Verify cluster
echo "Verifying cluster compatibility..."
istioctl analyze
 
# Install Istio
echo "Installing Istio on cluster..."
istioctl install --set profile=production -y
 
# Verify installation
echo "Verifying installation..."
kubectl get ns $NAMESPACE
kubectl get pods -n $NAMESPACE
 
# Label namespaces for sidecar injection
echo "Configuring sidecar injection..."
kubectl label namespace production istio-injection=enabled --overwrite
 
# Wait for sidecars
echo "Waiting for sidecars to be injected..."
kubectl rollout restart deployment -n production
 
echo "Istio installation complete!"
 
# Show status
istioctl version