istio：使用 grpc 和 http 的入口

Question

我有一个服务在两个端口上监听；一个是http，另一个是grpc。我想设置一个可以路由到这两个端口的入口，使用相同的主机。

如果使用 http/1.1，负载均衡器将重定向到 http 端口，如果使用 h2，则重定向到 grpc 端口。

有没有办法用 istio 做到这一点？

我做了一个 hello world 来展示我想要实现的目标：

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: hello-world
  namespace: dev
spec:
  replicas: 1
  template:
    metadata:
      annotations:
        alpha.istio.io/sidecar: injected
        pod.beta.kubernetes.io/init-containers: '[{"args":["-p","15001","-u","1337","-i","172.20.0.0/16"],"image":"docker.io/istio/init:0.1","imagePullPolicy":"Always","name":"init","securityContext":{"capabilities":{"add":["NET_ADMIN"]}}}]'
      labels:
        app: hello-world
    spec:
      containers:
      - name: grpc-server
        image: aguilbau/hello-world-grpc:latest
        ports:
        - name: grpc
          containerPort: 50051
      - name: http-server
        image: nginx:1.7.9
        ports:
        - name: http
          containerPort: 80
      - name: istio-proxy
        args:
        - proxy
        - sidecar
        - -v
        - "2"
        env:
        - name: POD_NAME
          valueFrom:
            fieldRef:
              fieldPath: metadata.name
        - name: POD_NAMESPACE
          valueFrom:
            fieldRef:
              fieldPath: metadata.namespace
        - name: POD_IP
          valueFrom:
            fieldRef:
              fieldPath: status.podIP
        image: docker.io/istio/proxy:0.1
        imagePullPolicy: Always
        resources: {}
        securityContext:
          runAsUser: 1337
---
apiVersion: v1
kind: Service
metadata:
  name: hello-world
  namespace: dev
spec:
  ports:
  - name: grpc
    port: 50051
  - name: http
    port: 80
  selector:
    app: hello-world
---
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: hello-world-http
  namespace: dev
  annotations:
    kubernetes.io/ingress.class: "istio"
spec:
  rules:
  - host: hello-world
    http:
      paths:
      - backend:
          serviceName: hello-world
          servicePort: 80
---
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: hello-world-grpc
  namespace: dev
  annotations:
    kubernetes.io/ingress.class: "istio"
spec:
  rules:
  - host: hello-world
    http:
      paths:
      - backend:
          serviceName: hello-world
          servicePort: 50051
---

Answer 1

我参加聚会有点晚了，但是对于那些在这篇文章中磕磕绊绊的人，我认为您可以毫不费力地做到这一点。我将假设您在 kubernetes 集群上安装了 istio，并且很高兴使用默认的 istio-ingressgateway：

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: hello-world
  namespace: dev
spec:
  replicas: 1
  template:
    metadata:
      annotations:
        alpha.istio.io/sidecar: injected
        pod.beta.kubernetes.io/init-containers: '[{"args":["-p","15001","-u","1337","-i","172.20.0.0/16"],"image":"docker.io/istio/init:0.1","imagePullPolicy":"Always","name":"init","securityContext":{"capabilities":{"add":["NET_ADMIN"]}}}]'
      labels:
        app: hello-world
    spec:
      containers:
      - name: grpc-server
        image: aguilbau/hello-world-grpc:latest
        ports:
        - name: grpc
          containerPort: 50051
      - name: http-server
        image: nginx:1.7.9
        ports:
        - name: http
          containerPort: 80
      - name: istio-proxy
        args:
        - proxy
        - sidecar
        - -v
        - "2"
        env:
        - name: POD_NAME
          valueFrom:
            fieldRef:
              fieldPath: metadata.name
        - name: POD_NAMESPACE
          valueFrom:
            fieldRef:
              fieldPath: metadata.namespace
        - name: POD_IP
          valueFrom:
            fieldRef:
              fieldPath: status.podIP
        image: docker.io/istio/proxy:0.1
        imagePullPolicy: Always
        resources: {}
        securityContext:
          runAsUser: 1337

---

apiVersion: v1
kind: Service
metadata:
  name: hello-world
  namespace: dev
spec:
  ports:
  - name: grpc
    port: 50051
  - name: http
    port: 80
  selector:
    app: hello-world

---

apiVersion: networking.istio.io/v1alpha3
kind: Gateway
metadata:
  name: hello-world-istio-gate
  namespace: dev
spec:
  selector:
    istio: ingressgateway
  servers:
  - port:
      number: 80
      name: http
      protocol: HTTP
    hosts:
    - "*"
  - port:
      number: 50051
      name: grpc
      protocol: GRPC
    hosts:
    - "*"

---

apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
  name: hello-world-istio-vsvc
  namespace: dev
spec:
  hosts:
  - "*"
  gateways:
  - hello-world-istio-gate
  http:
  - match:
    - port: 80
    route:
    - destination:
        host: hello-world
        port:
          number: 80
  tcp:
  - match:
    - port: 50051
    route:
    - destination:
        host: hello-world
        port:
          number: 50051

上面的配置省略了你的两个 Ingress，而是包括：

1. 您的部署
2. 您的服务
3. istio 网关
4. istio 虚拟服务

有一个重要的额外部分没有显示，我之前在谈论使用默认 ingressgateway 时提到过它。在“hello-world-istio-gateway”中找到的以下行提供了一个线索：

istio: ingressgateway

这指的是“istio-system”命名空间中的一个 pod，它通常默认安装为“istio-ingressgateway”——这个 pod 由一个也称为“istio-ingressgateway”的服务公开。 您需要在“istio-ingressgateway”服务上打开端口。

例如，我编辑了我的（默认）ingressgateway，并为 HTTP 和 GRPC 添加了一个端口开放。结果是以下（针对长度进行了编辑）yaml 代码：

dampersand@kubetest1:~/k8s$ kubectl get service istio-ingressgateway -n istio-system -o yaml
apiVersion: v1
kind: Service
metadata:

<omitted for length>

  labels:
    app: istio-ingressgateway
    chart: gateways-1.0.3
    heritage: Tiller
    istio: ingressgateway
    release: istio
  name: istio-ingressgateway
  namespace: istio-system

  <omitted for length>

  ports:
  - name: http2
    nodePort: 31380
    port: 80
    protocol: TCP
    targetPort: 80

  <omitted for length>

  - name: grpc
    nodePort: 30000
    port: 50051
    protocol: TCP
    targetPort: 50051
  selector:
    app: istio-ingressgateway
    istio: ingressgateway
  type: NodePort

进行上述更改（用于测试目的）的最简单方法是使用：

kubectl edit svc -n istio-system istio-ingressgateway

出于生产目的，最好编辑您的 helm chart 或 istio.yaml 文件或您最初用于设置 ingressgateway 的任何文件。

顺便说一句，请注意我的测试集群将 istio-ingressgateway 设置为 NodePort，所以上面的 yaml 文件说的是我的集群正在端口转发 31380 -> 80 和 30000 -> 50051。您可能（可能）有istio-ingressgateway 设置为 LoadBalancer，这会有所不同......因此请相应地计划。

最后，以下博客文章是我在这篇文章中概述的工具的一些非常出色的背景阅读材料！https://blog.jayway.com/2018/10/22/understanding-istio-ingress-gateway-in-kubernetes/