Istio Ingress Gateway中的Envoy配置解析

本文作者：ServiceMesher 社区成员沈旭光
本文重点为分析Istio Gateway以及VirtualService定义如何生成Istio Ingress Gateway的Envoy相关配置。

• gateway定义用于配置在mesh边缘，到mesh的tcp和http的负载均衡。

非TLS单主机环境

相关拓扑

• 使用azure aks环境。

• ingress gateway的service类型为loadbalancer。

• ingress gateway的service enternal ip为104.211.54.62。

• 通过该external ip对应的域名，访问ingress gateway svc。

• 增加gateway定义。

• gateway定义中的selector会将该设置与相应的gateway pod绑定。

• gateway定义中的servers会在相应的pod中生成listener实例，该拓扑中的监听端口为80。

• 需要将80端口注册到该gateway pod对应的服务中（默认已注册）。

• gateway定义中的hosts表示listener会向哪些特定的虚拟主机转发流量，在该示例中为httpbin.7cb9a9b7b318440399a0.eastus.aksapp.io。

• 增加virtualservice定义。

• virtualservice定义中的hosts与gateway中的hosts相对应，表示该服务可以注册到gateway的监听中，这个host写会更新到gateway pod路由表的虚拟主机条目中。

• virtualservice定义中的gateways将virtualservice与gateway关联起来。

• virtualservice定义中的http定义了路由规则，路由规则会写入到相应gateway pod的路由表中。

相关配置

apiVersion: networking.istio.io/v1alpha3kind: Gatewaymetadata:  name: httpbin-gatewayspec:  selector:    istio: ingressgateway  servers:  - port:      number: 80      name: http-httpbin      protocol: HTTP    hosts:    - "httpbin.7cb9a9b7b318440399a0.eastus.aksapp.io"复制代码

• gateway相关配置。

• 该定义与包含istio: ingressgateway label的ingress gateway pod绑定。

• 新建80端口监听。

• 监听主机为httpbin.7cb9a9b7b318440399a0.eastus.aksapp.io的请求。

apiVersion: networking.istio.io/v1alpha3kind: VirtualServicemetadata:  name: httpbin-vsspec:  hosts:  - "httpbin.7cb9a9b7b318440399a0.eastus.aksapp.io"  gateways:  - httpbin-gateway  http:  - match:    - uri:        prefix: /status    - uri:        prefix: /delay    - uri:        prefix: /headers    route:    - destination:        port:          number: 8000        host: httpbin.default.svc.cluster.local复制代码

• virtualservice相关配置。

• 将该配置应用到名称为httpbin-gateway的实例中。

• 定义路由规则和相关转发目的地。

[~/K8s/istio/istio-azure-1.0.2/samples/httpbin]$ http http://httpbin.7cb9a9b7b318440399a0.eastus.aksapp.io/status/418HTTP/1.1 418 Unknownaccess-control-allow-credentials: trueaccess-control-allow-origin: *content-length: 135date: Sat, 03 Nov 2018 16:20:59 GMTserver: envoyx-envoy-upstream-service-time: 4x-more-info: http://tools.ietf.org/html/rfc2324​    -=[ teapot ]=-​       _...._     .'  _ _ `.    | ."` ^ `". _,    \_;`"---"`|//      |       ;/      \_     _/        `"""`​[~/K8s/istio/istio-azure-1.0.2/samples/httpbin]$复制代码

• 测试结果。

• 通过主机httpbin.7cb9a9b7b318440399a0.eastus.aksapp.io，可以正常访问httpbin pod。

TLS单主机环境

相关拓扑

• 使用azure aks环境。

• ingress gateway的service类型为loadbalancer。

• ingress gateway的service enternal ip为104.211.54.62。

• 通过该external ip对应的域名，访问ingress gateway svc。

• 客户端使用tls方式访问主机。

• tls请求在ingress gateway处被卸载，并转化为http请求。

• 增加gateway定义。

• gateway定义中的监听端口包括80和443。

• 在80中启用httpsredirect。

• 在443中启用simple tls。

• 指定443的key和cert。

• 增加virtualservice定义，并定义相应路由规则。

相关配置

openssl req \-newkey rsa:4096 -nodes -sha256 -keyout ca.key \-x509 -days 3655 -out ca.crt​openssl req \-newkey rsa:4096 -nodes -sha256 -keyout httpbin-tls.key \-out httpbin-tls.csr​echo subjectAltName = DNS:httpbin.7cb9a9b7b318440399a0.eastus.aksapp.io > extfile-httpbin-tls.cnf​openssl x509 \-req -days 3655 -in httpbin-tls.csr -CA ca.crt -CAkey ca.key \-CAcreateserial -extfile extfile-httpbin-tls.cnf -out httpbin-tls.crt​kubectl create -n istio-system secret tls istio-ingressgateway-certs --key ./httpbin-tls.key --cert ./httpbin-tls.crt复制代码

• 自签名证书相关配置。

• k8s secret相关配置。

apiVersion: networking.istio.io/v1alpha3kind: Gatewaymetadata:  name: httpbin-tls-gatewayspec:  selector:    istio: ingressgateway  servers:  - port:      number: 80      name: http-httpbin      protocol: HTTP    hosts:    - "httpbin.7cb9a9b7b318440399a0.eastus.aksapp.io"    tls:      httpsRedirect: true  - port:      number: 443      name: https-httpbin      protocol: HTTPS    tls:      mode: SIMPLE      serverCertificate: /etc/istio/ingressgateway-certs/tls.crt      privateKey: /etc/istio/ingressgateway-certs/tls.key    hosts:    - "httpbin.7cb9a9b7b318440399a0.eastus.aksapp.io"复制代码

• gateway相关配置。

• 新建监听端口包括80和443。

• 在80中启用httpsredirect。

• 在443中启用simple tls。

• 指定443的key和cert。

apiVersion: networking.istio.io/v1alpha3kind: VirtualServicemetadata:  name: httpbin-tls-vsspec:  hosts:  - "httpbin.7cb9a9b7b318440399a0.eastus.aksapp.io"  gateways:  - httpbin-tls-gateway  http:  - match:    - uri:        prefix: /status    route:    - destination:        port:          number: 8000        host: httpbin.default.svc.cluster.local复制代码

• virtualservice相关配置。

• 配置相关路由。

[~/K8s/istio/istio-azure-1.0.2/samples/httpbin]$ http http://httpbin.7cb9a9b7b318440399a0.eastus.aksapp.io/status/418 --verify no --follow -vGET /status/418 HTTP/1.1Accept: */*Accept-Encoding: gzip, deflateConnection: keep-aliveHost: httpbin.7cb9a9b7b318440399a0.eastus.aksapp.ioUser-Agent: HTTPie/0.9.9​HTTP/1.1 301 Moved Permanentlycontent-length: 0date: Sat, 03 Nov 2018 19:25:25 GMTlocation: https://httpbin.7cb9a9b7b318440399a0.eastus.aksapp.io/status/418server: envoy​GET /status/418 HTTP/1.1Accept: */*Accept-Encoding: gzip, deflateConnection: keep-aliveHost: httpbin.7cb9a9b7b318440399a0.eastus.aksapp.ioUser-Agent: HTTPie/0.9.9​HTTP/1.1 418 Unknownaccess-control-allow-credentials: trueaccess-control-allow-origin: *content-length: 135date: Sat, 03 Nov 2018 19:25:26 GMTserver: envoyx-envoy-upstream-service-time: 6x-more-info: http://tools.ietf.org/html/rfc2324​    -=[ teapot ]=-​       _...._     .'  _ _ `.    | ."` ^ `". _,    \_;`"---"`|//      |       ;/      \_     _/        `"""`​[~/K8s/istio/istio-azure-1.0.2/samples/httpbin]$复制代码

• httpsredirect测试结果。

• 通过http方式访问httpbin.7cb9a9b7b318440399a0.eastus.aksapp.io，可以正常访问httpbin pod。

[~/K8s/istio/istio-azure-1.0.2/samples/httpbin]$ http https://httpbin.7cb9a9b7b318440399a0.eastus.aksapp.io/status/418 --verify no -vGET /status/418 HTTP/1.1Accept: */*Accept-Encoding: gzip, deflateConnection: keep-aliveHost: httpbin.7cb9a9b7b318440399a0.eastus.aksapp.ioUser-Agent: HTTPie/0.9.9​HTTP/1.1 418 Unknownaccess-control-allow-credentials: trueaccess-control-allow-origin: *content-length: 135date: Sat, 03 Nov 2018 19:26:21 GMTserver: envoyx-envoy-upstream-service-time: 5x-more-info: http://tools.ietf.org/html/rfc2324​    -=[ teapot ]=-​       _...._     .'  _ _ `.    | ."` ^ `". _,    \_;`"---"`|//      |       ;/      \_     _/        `"""`​[~/K8s/istio/istio-azure-1.0.2/samples/httpbin]$复制代码

• https测试结果。

• 通过https方式访问httpbin.7cb9a9b7b318440399a0.eastus.aksapp.io，可以正常访问httpbin pod。

mTLS单主机环境

相关拓扑

• 使用azure aks环境。

• ingress gateway的service类型为loadbalancer。

• ingress gateway的service enternal ip为104.211.54.62。

• 通过该external ip对应的域名，访问ingress gateway svc。

• 客户端使用mtls方式访问主机。

• mtls请求在ingress gateway处被卸载，并转化为http请求。

• 增加gateway定义。

• gateway定义中的监听端口443。

• 在443中启用mtls。

• 指定443的key和cert。

• 指定443的ca cert。

• 指定允许连接443的san。

• 增加virtualservice定义，并定义相应路由规则。

相关配置

openssl req \-newkey rsa:4096 -nodes -sha256 -keyout ca.key \-x509 -days 3655 -out ca.crt​openssl req \-newkey rsa:4096 -nodes -sha256 -keyout httpbin-mtls.key \-out httpbin-mtls.csr​echo subjectAltName = DNS:httpbin.6491dea3ce6b4d17b109.eastus.aksapp.io > extfile-httpbin-mtls.cnf​openssl x509 \-req -days 3655 -in httpbin-mtls.csr -CA ca.crt -CAkey ca.key \-CAcreateserial -extfile extfile-httpbin-mtls.cnf -out httpbin-mtls.crt​openssl req \-newkey rsa:4096 -nodes -sha256 -keyout client.key \-out client.csr​echo subjectAltName = DNS:is5.istio.client > client-extfile.cnf​openssl x509 \-req -days 3655 -in client.csr -CA ca.crt -CAkey ca.key \-CAcreateserial -extfile client-extfile.cnf -out client.crt​kubectl create -n istio-system secret tls istio-ingressgateway-certs --key ./httpbin-mtls.key --cert ./httpbin-mtls.crtkubectl create -n istio-system secret generic istio-ingressgateway-ca-certs --from-file ./ca.crt复制代码

• server端自签名证书相关配置。

• client端自签名证书相关配置。

• k8s secret相关配置。

apiVersion: networking.istio.io/v1alpha3kind: Gatewaymetadata:  name: httpbin-mtls-gatewayspec:  selector:    istio: ingressgateway  servers:  - port:      number: 443      name: https-httpbin      protocol: HTTPS    tls:      mode: MUTUAL      serverCertificate: /etc/istio/ingressgateway-certs/tls.crt      privateKey: /etc/istio/ingressgateway-certs/tls.key      caCertificates: /etc/istio/ingressgateway-ca-certs/ca.crt      subjectAltNames:      - is5.istio.client    hosts:    - "httpbin.6491dea3ce6b4d17b109.eastus.aksapp.io"复制代码

• gateway相关配置。

• 新建监听端口443。

• 在443中启用mtls。

• 指定443的key和cert。

• 指定443的ca cert。

• 指定允许连接443的san。

apiVersion: networking.istio.io/v1alpha3kind: VirtualServicemetadata:  name: httpbin-tls-vsspec:  hosts:  - "httpbin.6491dea3ce6b4d17b109.eastus.aksapp.io"  gateways:  - httpbin-mtls-gateway  http:  - match:    - uri:        prefix: /status    route:    - destination:        port:          number: 8000        host: httpbin.default.svc.cluster.local复制代码

• virtualservice相关配置。

• 配置相关路由。

[~/K8s/istio/istio-azure-1.0.2/samples/httpbin/ssl]$ http https://httpbin.6491dea3ce6b4d17b109.eastus.aksapp.io/status/418 --verify no --cert ./client.crt --cert-key ./client.keyHTTP/1.1 418 Unknownaccess-control-allow-credentials: trueaccess-control-allow-origin: *content-length: 135date: Sun, 04 Nov 2018 15:28:47 GMTserver: envoyx-envoy-upstream-service-time: 6x-more-info: http://tools.ietf.org/html/rfc2324​    -=[ teapot ]=-​       _...._     .'  _ _ `.    | ."` ^ `". _,    \_;`"---"`|//      |       ;/      \_     _/        `"""`​[~/K8s/istio/istio-azure-1.0.2/samples/httpbin/ssl]复制代码

• 测试结果。

• 通过https mtls方式访问httpbin.6491dea3ce6b4d17b109.eastus.aksapp.io，可以正常访问httpbin pod。

非TLS多主机环境

相关拓扑

• 使用azure aks环境。

• ingress gateway的service类型为loadbalancer。

• ingress gateway的service enternal ip为104.211.54.62。

• 通过该external ip对应的域名，访问ingress gateway svc。

• 2个主机，分别为：httpbin-a.6491dea3ce6b4d17b109.eastus.aksapp.io和httpbin-b.6491dea3ce6b4d17b109.eastus.aksapp.io。

• 客户端使用http方式访问主机。

• 为2个主机配置统一的gateway定义。

• 为2个主机分别配置virtualservice定义。

• 主机httpbin-a.6491dea3ce6b4d17b109.eastus.aksapp.io被路由至pod httpbin-a的/status uri。

• 主机httpbin-b.6491dea3ce6b4d17b109.eastus.aksapp.io被路由至pod httpbin-b的/headers uri。

• 在gateway的listnener中生成统一的监听0.0.0.0_80。

• 在gateway的route中分别生成针对httpbin-a和httpbin-b的虚拟主机。

相关配置

apiVersion: networking.istio.io/v1alpha3kind: Gatewaymetadata:  name: httpbin-dual-gatewayspec:  selector:    istio: ingressgateway  servers:  - port:      number: 80      name: http-httpbin      protocol: HTTP    hosts:    - "httpbin-a.6491dea3ce6b4d17b109.eastus.aksapp.io"    - "httpbin-b.6491dea3ce6b4d17b109.eastus.aksapp.io"​apiVersion: networking.istio.io/v1alpha3kind: Gatewaymetadata:  name: httpbin-dual-gatewayspec:  selector:    istio: ingressgateway  servers:  - port:      number: 80      name: http-httpbina      protocol: HTTP    hosts:    - "httpbin-a.6491dea3ce6b4d17b109.eastus.aksapp.io"  - port:      number: 80      name: http-httpbinb      protocol: HTTP    hosts:    - "httpbin-b.6491dea3ce6b4d17b109.eastus.aksapp.io"复制代码

• gateway相关配置。

• 这2个gateway的配置，生成的envoy配置是一致的。

• 新建监听端口80。

• 分别针对两个主机httpbin-a和httpbin-b进行监听。

apiVersion: networking.istio.io/v1alpha3kind: VirtualServicemetadata:  name: httpbin-a-vsspec:  hosts:  - "httpbin-a.6491dea3ce6b4d17b109.eastus.aksapp.io"  gateways:  - httpbin-dual-gateway  http:  - match:    - uri:        prefix: /status    route:    - destination:        port:          number: 8000        host: httpbin-a.default.svc.cluster.local​apiVersion: networking.istio.io/v1alpha3kind: VirtualServicemetadata:  name: httpbin-b-vsspec:  hosts:  - "httpbin-b.6491dea3ce6b4d17b109.eastus.aksapp.io"  gateways:  - httpbin-dual-gateway  http:  - match:    - uri:        prefix: /headers    route:    - destination:        port:          number: 8000        host: httpbin-b.default.svc.cluster.local复制代码

• httpbin-a和httpbin-b的virtualservice相关配置。

• httpbin-a.6491dea3ce6b4d17b109.eastus.aksapp.io的/status请求被路由至httpbin-a。

• httpbin-b.6491dea3ce6b4d17b109.eastus.aksapp.io的/headers请求被路由至httpbin-b。

[~/K8s/istio/istio-azure-1.0.2/samples/httpbin/ssl]$ http http://httpbin-a.6491dea3ce6b4d17b109.eastus.aksapp.io/status/418HTTP/1.1 418 Unknownaccess-control-allow-credentials: trueaccess-control-allow-origin: *content-length: 135date: Sun, 04 Nov 2018 16:27:07 GMTserver: envoyx-envoy-upstream-service-time: 10x-more-info: http://tools.ietf.org/html/rfc2324​    -=[ teapot ]=-​       _...._     .'  _ _ `.    | ."` ^ `". _,    \_;`"---"`|//      |       ;/      \_     _/        `"""`​[~/K8s/istio/istio-azure-1.0.2/samples/httpbin/ssl]$ http http://httpbin-b.6491dea3ce6b4d17b109.eastus.aksapp.io/headersHTTP/1.1 200 OKaccess-control-allow-credentials: trueaccess-control-allow-origin: *content-length: 412content-type: application/jsondate: Sun, 04 Nov 2018 16:27:25 GMTserver: envoyx-envoy-upstream-service-time: 7​{    "headers": {        "Accept": "*/*",        "Accept-Encoding": "gzip, deflate",        "Content-Length": "0",        "Host": "httpbin-b.6491dea3ce6b4d17b109.eastus.aksapp.io",        "User-Agent": "HTTPie/0.9.9",        "X-B3-Sampled": "1",        "X-B3-Spanid": "9b6889437bfe02c8",        "X-B3-Traceid": "9b6889437bfe02c8",        "X-Envoy-Internal": "true",        "X-Request-Id": "e43ae114-52dd-9ee4-930b-dbb0405c6fef"    }}​[~/K8s/istio/istio-azure-1.0.2/samples/httpbin/ssl]$复制代码

• 测试结果。

• 请求httpbin-a.6491dea3ce6b4d17b109.eastus.aksapp.io/status/418和httpbin-b.6491dea3ce6b4d17b109.eastus.aksapp.io/headers均可以被正确路由。

TLS多主机环境

相关拓扑

• 使用azure aks环境。

• ingress gateway的service类型为loadbalancer。

• ingress gateway的service enternal ip为104.211.54.62。

• 通过该external ip对应的域名，访问ingress gateway svc。

• 2个主机，分别为：httpbin-a.6491dea3ce6b4d17b109.eastus.aksapp.io和httpbin-b.6491dea3ce6b4d17b109.eastus.aksapp.io。

• 客户端使用tls方式访问主机。

• 为2个主机分别配置gateway中的server定义。

• 为2个主机的server定义中增加证书的定义，每个server使用不同的证书。

• 为2个主机分别配置virtualservice定义。

• 在gateway的listnener中生成统一的监听0.0.0.0_443。

• 因为gateway中配置的2个server中有不相同的配置，所以在监听0.0.0.0_443中，会生成2个server，分别为httpbin-a.6491dea3ce6b4d17b109.eastus.aksapp.io和httpbin-b.6491dea3ce6b4d17b109.eastus.aksapp.io。

• 因为监听中生成2个server，所以在路由中会生成2条不同的路由相对应，在gateway的路由中生成分别的虚拟主机https.443.https-httpbina和https.443.https-httpbinb。

• 监听0.0.0.0_443所属的server httpbin-a.6491dea3ce6b4d17b109.eastus.aksapp.io被关联至路由https.443.https-httpbina，server httpbin-b.6491dea3ce6b4d17b109.eastus.aksapp.io被关联至路由https.443.https-httpbinb。

• 主机httpbin-a被路由至pod httpbin-a的/status uri。

• 主机httpbin-b被路由至pod httpbin-b的/headers uri。

相关配置

openssl req \-newkey rsa:4096 -nodes -sha256 -keyout ca.key \-x509 -days 3655 -out ca.crt​openssl req \-newkey rsa:4096 -nodes -sha256 -keyout httpbin-a-tls.key \-out httpbin-a-tls.csr​echo subjectAltName = DNS:httpbin-a.6491dea3ce6b4d17b109.eastus.aksapp.io > extfile-httpbin-a-tls.cnf​openssl x509 \-req -days 3655 -in httpbin-a-tls.csr -CA ca.crt -CAkey ca.key \-CAcreateserial -extfile extfile-httpbin-a-tls.cnf -out httpbin-a-tls.crt​openssl req \-newkey rsa:4096 -nodes -sha256 -keyout httpbin-b-tls.key \-out httpbin-b-tls.csr​echo subjectAltName = DNS:httpbin-b.6491dea3ce6b4d17b109.eastus.aksapp.io > extfile-httpbin-b-tls.cnf​openssl x509 \-req -days 3655 -in httpbin-b-tls.csr -CA ca.crt -CAkey ca.key \-CAcreateserial -extfile extfile-httpbin-b-tls.cnf -out httpbin-b-tls.crt​kubectl create -n istio-system secret tls istio-ingressgateway-httpbin-a-certs --key ./httpbin-a-tls.key --cert ./httpbin-a-tls.crtkubectl create -n istio-system secret tls istio-ingressgateway-httpbin-b-certs --key ./httpbin-b-tls.key --cert ./httpbin-b-tls.crt复制代码

• 自签名证书相关配置。

• k8s secret相关配置。

helm template install/kubernetes/helm/istio/ --name istio-ingressgateway --namespace istio-system -x charts/gateways/templates/deployment.yaml --set gateways.istio-egressgateway.enabled=false \--set gateways.istio-ingressgateway.secretVolumes[0].name=ingressgateway-ca-certs \--set gateways.istio-ingressgateway.secretVolumes[0].secretName=istio-ingressgateway-ca-certs \--set gateways.istio-ingressgateway.secretVolumes[0].mountPath=/etc/istio/ingressgateway-ca-certs \--set gateways.istio-ingressgateway.secretVolumes[1].name=ingressgateway-httpbin-a-certs \--set gateways.istio-ingressgateway.secretVolumes[1].secretName=istio-ingressgateway-httpbin-a-certs \--set gateways.istio-ingressgateway.secretVolumes[1].mountPath=/etc/istio/ingressgateway-httpbin-a-certs \--set gateways.istio-ingressgateway.secretVolumes[2].name=ingressgateway-httpbin-b-certs \--set gateways.istio-ingressgateway.secretVolumes[2].secretName=istio-ingressgateway-httpbin-b-certs \--set gateways.istio-ingressgateway.secretVolumes[2].mountPath=/etc/istio/ingressgateway-httpbin-b-certs > \./helm-ingressgateway-httpbin-dual-tls.yaml​...          volumeMounts:          - name: istio-certs            mountPath: /etc/certs            readOnly: true          - name: ingressgateway-ca-certs            mountPath: "/etc/istio/ingressgateway-ca-certs"            readOnly: true          - name: ingressgateway-httpbin-a-certs            mountPath: "/etc/istio/ingressgateway-httpbin-a-certs"            readOnly: true          - name: ingressgateway-httpbin-b-certs            mountPath: "/etc/istio/ingressgateway-httpbin-b-certs"            readOnly: true      volumes:      - name: istio-certs        secret:          secretName: istio.istio-ingressgateway-service-account          optional: true      - name: ingressgateway-ca-certs        secret:          secretName: "istio-ingressgateway-ca-certs"          optional: true      - name: ingressgateway-httpbin-a-certs        secret:          secretName: "istio-ingressgateway-httpbin-a-certs"          optional: true      - name: ingressgateway-httpbin-b-certs        secret:          secretName: "istio-ingressgateway-httpbin-b-certs"          optional: true...复制代码

• 修改了ingress gateway deployment的配置，可以支持多个证书。

• 分别包含域名为httpbin-a和httpbin-b的证书。

apiVersion: networking.istio.io/v1alpha3kind: Gatewaymetadata:  name: httpbin-dual-tls-gatewayspec:  selector:    istio: ingressgateway  servers:  - port:      number: 443      name: https-httpbina      protocol: HTTPS    tls:      mode: SIMPLE      serverCertificate: /etc/istio/ingressgateway-httpbin-a-certs/tls.crt      privateKey: /etc/istio/ingressgateway-httpbin-a-certs/tls.key    hosts:    - "httpbin-a.6491dea3ce6b4d17b109.eastus.aksapp.io"  - port:      number: 443      name: https-httpbinb      protocol: HTTPS    tls:      mode: SIMPLE      serverCertificate: /etc/istio/ingressgateway-httpbin-b-certs/tls.crt      privateKey: /etc/istio/ingressgateway-httpbin-b-certs/tls.key    hosts:    - "httpbin-b.6491dea3ce6b4d17b109.eastus.aksapp.io"复制代码

• gateway相关配置。

• 分别定义2个server，每个server配置不同的证书。

apiVersion: networking.istio.io/v1alpha3kind: VirtualServicemetadata:  name: httpbin-a-vsspec:  hosts:  - "httpbin-a.6491dea3ce6b4d17b109.eastus.aksapp.io"  gateways:  - httpbin-dual-tls-gateway  http:  - match:    - uri:        prefix: /status    route:    - destination:        port:          number: 8000        host: httpbin-a.default.svc.cluster.local​apiVersion: networking.istio.io/v1alpha3kind: VirtualServicemetadata:  name: httpbin-b-vsspec:  hosts:  - "httpbin-b.6491dea3ce6b4d17b109.eastus.aksapp.io"  gateways:  - httpbin-dual-tls-gateway  http:  - match:    - uri:        prefix: /headers    route:    - destination:        port:          number: 8000        host: httpbin-b.default.svc.cluster.local复制代码

• httpbin-a和httpbin-b的virtualservice相关配置。

• httpbin-a.6491dea3ce6b4d17b109.eastus.aksapp.io的/status请求被路由至httpbin-a。

• httpbin-b.6491dea3ce6b4d17b109.eastus.aksapp.io的/headers请求被路由至httpbin-b。

[~/K8s/istio/istio-azure-1.0.2/samples/httpbin/ssl]$ http https://httpbin-a.6491dea3ce6b4d17b109.eastus.aksapp.io/status/418 --verify noHTTP/1.1 418 Unknownaccess-control-allow-credentials: trueaccess-control-allow-origin: *content-length: 135date: Sun, 04 Nov 2018 17:36:30 GMTserver: envoyx-envoy-upstream-service-time: 6x-more-info: http://tools.ietf.org/html/rfc2324​    -=[ teapot ]=-​       _...._     .'  _ _ `.    | ."` ^ `". _,    \_;`"---"`|//      |       ;/      \_     _/        `"""`​[~/K8s/istio/istio-azure-1.0.2/samples/httpbin/ssl]$ http https://httpbin-b.6491dea3ce6b4d17b109.eastus.aksapp.io/headers --verify noHTTP/1.1 200 OKaccess-control-allow-credentials: trueaccess-control-allow-origin: *content-length: 412content-type: application/jsondate: Sun, 04 Nov 2018 17:36:33 GMTserver: envoyx-envoy-upstream-service-time: 8​{    "headers": {        "Accept": "*/*",        "Accept-Encoding": "gzip, deflate",        "Content-Length": "0",        "Host": "httpbin-b.6491dea3ce6b4d17b109.eastus.aksapp.io",        "User-Agent": "HTTPie/0.9.9",        "X-B3-Sampled": "1",        "X-B3-Spanid": "27a46e99214fe1e1",        "X-B3-Traceid": "27a46e99214fe1e1",        "X-Envoy-Internal": "true",        "X-Request-Id": "6c1ace56-7f57-9b0d-bb3d-2eb57519c4a2"    }}​[~/K8s/istio/istio-azure-1.0.2/samples/httpbin/ssl]$​复制代码

• 测试结果。

• 请求httpbin-a.6491dea3ce6b4d17b109.eastus.aksapp.io/status/418和httpbin-b.6491dea3ce6b4d17b109.eastus.aksapp.io/headers均可以被正确路由。

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