feat(aula-14): adicionar Istio Traffic Splitting com canary deployment

- Instala Istio (base + istiod + ingressgateway)
- Configura Kiali e Jaeger para observabilidade
- Deploy de app-backend v1 e v2 com traffic splitting 90/10
- Integra com Victoria Metrics da aula-12
- Inclui teste-stress.sh para validar distribuição de tráfego
- Tráfego externo passa pelo Istio Gateway via NGINX Ingress

aula-14/k8s/deployment-v1.yaml

@@ -0,0 +1,53 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: app-backend-v1
+  namespace: istio
+  labels:
+    app: app-backend
+    version: v1
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: app-backend
+      version: v1
+  template:
+    metadata:
+      labels:
+        app: app-backend
+        version: v1
+    spec:
+      imagePullSecrets:
+        - name: regcred
+      containers:
+        - name: app-backend
+          image: ${REGISTRY_HOST}/${REGISTRY_PROJECT}/app-backend:v1
+          imagePullPolicy: Always
+          ports:
+            - containerPort: 3000
+          env:
+            - name: MAX_REQUESTS
+              value: "100"
+          resources:
+            requests:
+              memory: "64Mi"
+              cpu: "50m"
+            limits:
+              memory: "128Mi"
+              cpu: "100m"
+          livenessProbe:
+            httpGet:
+              path: /health
+              port: 3000
+            initialDelaySeconds: 5
+            periodSeconds: 5
+            failureThreshold: 3
+          readinessProbe:
+            httpGet:
+              path: /health
+              port: 3000
+            initialDelaySeconds: 3
+            periodSeconds: 3
+            failureThreshold: 2
+      terminationGracePeriodSeconds: 10

aula-14/k8s/deployment-v2.yaml

@@ -0,0 +1,53 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: app-backend-v2
+  namespace: istio
+  labels:
+    app: app-backend
+    version: v2
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: app-backend
+      version: v2
+  template:
+    metadata:
+      labels:
+        app: app-backend
+        version: v2
+    spec:
+      imagePullSecrets:
+        - name: regcred
+      containers:
+        - name: app-backend
+          image: ${REGISTRY_HOST}/${REGISTRY_PROJECT}/app-backend:v2
+          imagePullPolicy: Always
+          ports:
+            - containerPort: 3000
+          env:
+            - name: MAX_REQUESTS
+              value: "100"
+          resources:
+            requests:
+              memory: "64Mi"
+              cpu: "50m"
+            limits:
+              memory: "128Mi"
+              cpu: "100m"
+          livenessProbe:
+            httpGet:
+              path: /health
+              port: 3000
+            initialDelaySeconds: 5
+            periodSeconds: 5
+            failureThreshold: 3
+          readinessProbe:
+            httpGet:
+              path: /health
+              port: 3000
+            initialDelaySeconds: 3
+            periodSeconds: 3
+            failureThreshold: 2
+      terminationGracePeriodSeconds: 10

aula-14/k8s/destination-rule.yaml

@@ -0,0 +1,14 @@
+apiVersion: networking.istio.io/v1beta1
+kind: DestinationRule
+metadata:
+  name: app-backend
+  namespace: istio
+spec:
+  host: app-backend
+  subsets:
+    - name: v1
+      labels:
+        version: v1
+    - name: v2
+      labels:
+        version: v2

aula-14/k8s/gateway.yaml

@@ -0,0 +1,15 @@
+apiVersion: networking.istio.io/v1beta1
+kind: Gateway
+metadata:
+  name: app-gateway
+  namespace: istio
+spec:
+  selector:
+    istio: ingressgateway
+  servers:
+    - port:
+        number: 80
+        name: http
+        protocol: HTTP
+      hosts:
+        - "${APP_HOST}"

aula-14/k8s/ingress-app.yaml

@@ -0,0 +1,23 @@
+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  name: app-backend
+  namespace: istio-system
+  annotations:
+    nginx.ingress.kubernetes.io/backend-protocol: HTTP
+    nginx.ingress.kubernetes.io/upstream-vhost: "${APP_HOST}"
+    ${TLS_ANNOTATION}
+spec:
+  ingressClassName: nginx
+  ${TLS_CONFIG}
+  rules:
+    - host: ${APP_HOST}
+      http:
+        paths:
+          - path: /
+            pathType: Prefix
+            backend:
+              service:
+                name: istio-ingressgateway
+                port:
+                  number: 80

aula-14/k8s/ingress-jaeger.yaml

@@ -0,0 +1,25 @@
+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  name: jaeger
+  namespace: istio-system
+  annotations:
+    nginx.ingress.kubernetes.io/backend-protocol: HTTP
+    nginx.ingress.kubernetes.io/auth-type: basic
+    nginx.ingress.kubernetes.io/auth-secret: basic-auth
+    nginx.ingress.kubernetes.io/auth-realm: "Authentication Required"
+    ${TLS_ANNOTATION}
+spec:
+  ingressClassName: nginx
+  ${TLS_CONFIG}
+  rules:
+    - host: ${JAEGER_HOST}
+      http:
+        paths:
+          - path: /
+            pathType: Prefix
+            backend:
+              service:
+                name: tracing
+                port:
+                  number: 80

aula-14/k8s/ingress-kiali.yaml

@@ -0,0 +1,25 @@
+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  name: kiali
+  namespace: istio-system
+  annotations:
+    nginx.ingress.kubernetes.io/backend-protocol: HTTP
+    nginx.ingress.kubernetes.io/auth-type: basic
+    nginx.ingress.kubernetes.io/auth-secret: basic-auth
+    nginx.ingress.kubernetes.io/auth-realm: "Authentication Required"
+    ${TLS_ANNOTATION}
+spec:
+  ingressClassName: nginx
+  ${TLS_CONFIG}
+  rules:
+    - host: ${KIALI_HOST}
+      http:
+        paths:
+          - path: /
+            pathType: Prefix
+            backend:
+              service:
+                name: kiali
+                port:
+                  number: 20001

aula-14/k8s/namespace.yaml

@@ -0,0 +1,9 @@
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: istio
+  labels:
+    istio-injection: enabled
+    # Istio sidecar requer NET_ADMIN e NET_RAW capabilities
+    pod-security.kubernetes.io/enforce: privileged
+    pod-security.kubernetes.io/warn: privileged

aula-14/k8s/service.yaml

@@ -0,0 +1,14 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: app-backend
+  namespace: istio
+  labels:
+    app: app-backend
+spec:
+  ports:
+    - port: 80
+      targetPort: 3000
+      name: http
+  selector:
+    app: app-backend

aula-14/k8s/virtual-service.yaml

@@ -0,0 +1,22 @@
+apiVersion: networking.istio.io/v1beta1
+kind: VirtualService
+metadata:
+  name: app-backend
+  namespace: istio
+spec:
+  hosts:
+    - app-backend
+    - "${APP_HOST}"
+  gateways:
+    - app-gateway
+    - mesh
+  http:
+    - route:
+        - destination:
+            host: app-backend
+            subset: v1
+          weight: 90
+        - destination:
+            host: app-backend
+            subset: v2
+          weight: 10