sidecar? 1. Create ServiceEntry for external service such that Istio knows about Redis 2. Create DestinationRule to configure TLS origination for Redis apiVersion: networking.istio.io/v1beta1 kind: ServiceEntry number: 16222 name: tcp-redis protocol: TCP 1 apiVersion: networking.istio.io/v1beta1 2 kind: DestinationRule 3 metadata: 4 name: external-aiven-redis 5 namespace: redis 6 spec: 7 host: redis-1425a1d9-google-bc39 with a sidecar, however no ServiceEntry and no DestinationRule Expectation: Should fail when trying to connect over plain TCP 2. Create DestinationRule and ServiceEntry Expectation: Ability to connect

您应该看到类似如下的输出： destinationrule.networking.istio.io/productpage created destinationrule.networking.istio.io/reviews created destinationrule.networking.istio.io/ratings created destinationrule.networking.istio 4.4.2.6. 双向 TLS 的变化 当使用带有特定工作负载 PeerAuthentication 策略的 mTLS 时，如果工作负载策略与命名空间/全局策略不同，则需要一个对应的 DestinationRule 来允许流量。 ## auto mTLS 默认启用，但可以通过将 ServiceMeshControlPlane 资源中的 spec.security.dataPlane.automtls DestinationRules 进行服务间的正常通信。例如，将一个命名空间的 PeerAuthentication 设置为 STRICT 可能会阻止其他命名空间中的服务访问它们，除非 DestinationRule 为命名空间中的服务配置 TLS 模式。有关 mTLS 的详情请参考 启用 mutual Transport Layer Security（mTLS） ####### 1.11.4

Gateway  DestinationRule  VirtualService  Gateway DestinationRule  VirtualService  Gateway DestinationRule Istio Sidecar Proxy Some container ![Image](/uploads/documents/6/5/1/4/6514e5332769350ace

全链路泳道可以理解成是对一组服务实例按照一定方式进行拆分（例如部署环境），并基于全链路灰度路由能力，让流量能够精准按照规则在指定服务实例泳道中流动 （逻辑上如同游泳场中的泳道）。 在 Istio 中我们一般会通过 DestinationRule 的 subset 对实例进行分组，将一个服务拆分成不同子集（例如：按照版本、区域等属性拆分），然后配合 VirtualService 来定义对应的路由规则，将流量路由到对应子集中，从而完成泳道中的单跳路由能力。 label 即可。 ’ alt=‘OCR图片’/> 基于 DestinationRule 为服务设置一系列的 subsets: Productpage: v1 Reviews: v1、v2、v3 Ratings: v1、v2 apiVersion: networking.istio.io/v1alpha3 kind: DestinationRule metadata: name: productpage productpage subsets: name: v1 labels: version: v1 apiVersion: networking.istio.io/v1alpha3 kind: DestinationRule metadata: name: reviews spec: host: reviews subsets: name: v1 labels: version: v1 name: v2

attacker that is able to intercept raw network connections between Envoy proxies and upstream DestinationRule targets can perform a man-in-the-middle attack against clients whose TLS-configured DestinationRules ^{12} $ as part of its process to generate Envoy configurations from DestinationRule policies, Istio translates the DestinationRule trafficPolicy.tls (ClientTLSSettings) field into Envoy's UpstreamTlsContext validation_context Listing 3: istio/pilot/pkg/networking/core/v1alpha3/cluster.go Recommendation Update the DestinationRule documentation $ ^{16} $ to provide a clear warning early on that the lack of a configured caCertificates

Auto-mTLS in Istio ☑ Decide what type of traffic the client sidecar to send automatically ☐ If DestinationRule is configured, respect it ☐ If server has a sidecar and allows mTLS, send mTLS – reviews-v1 9_1.jpg) ## mTLS in Istio - DestinationRule ## Defines what type of traffic the client sidecar will send apiVersion: networking.istio.io/v1alpha3 kind: DestinationRule metadata: name: reviews

通信方案，Istio 的方案证书管理流程由 Citadel，Citadel Agent，Pilot 协同完成 ● Pilot 负责 UDS 路径配置下发，用户通过 Policy CRD 和 DestinationRule 来决策需要给哪些 Sidecar 下发 ● Sidecar 收到SDS Config 后，然后以 JWT 格式封装身份信息（service account）向Citadel Agent请求证书 对于Server 端利用Istio 的Policy CRD 实现 Namespace + Service 粒度的开关控制 ● 对于Client 端理想情况下，希望是通过Istio 的 DestinationRule 和 VirtualService 来控制。但由于相关条件尚未具备，因此通过现有注册中心来控制 Client TLS 能力 ## Service Mesh Sidecar 的TLS 生产级落地实践

virtualservice: proxy destinationrule: proxy-helloworld stateless ratelimit monitoring loadBalancer L7 traffic outlierDetection service deployment gateway virtualservice destinationrule istio ingress

sayHello("Aeraki"); 4. 设置相应的 DR 和 VS 流量规则 apiVersion: networking.istio.io/v1beta1 kind: DestinationRule metadata: name: dubbo-sample-provider namespace: dubbo spec: host: org.apache.dubbo zone 4. 通过 dr 规则启用 locality load balancing apiVersion: networking.istio.io/v1alpha3 kind: DestinationRule metadata: name: dubbo-circuit-breaker-rule spec: host: org.apache.dubbo.samples.basic

developers to consume this contract • Prior knowledge of Istio - Need to create VirtualService and DestinationRule before anything happens • VirtualService evaluation order matters ## Checkpoint 1. Minimize