一、 istio gateway使用demo

kubectl apply -f - <<EOF
apiVersion: networking.istio.io/v1alpha3
kind: Gateway
metadata:
  name: ngdemo-gateway
  namespace: ssx
spec:
  selector:
    istio: ingressgateway # use Istio default gateway implementation
  servers:
  - port:
      number: 80
      name: http
      protocol: HTTP
    hosts:
    - "tomcat.shenshuxin.cn"
EOF


kubectl apply -f - <<EOF
apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
  name: ngdemo-virtualservice
  namespace: ssx
spec:
  hosts:
  - "tomcat.shenshuxin.cn"
  gateways:
  - ngdemo-gateway
  http:
  - match:
    - uri:
        prefix: /v1
    route:
    - destination:
        port:
          number: 8082
        host: demo-tomcat-for-ingress-name
  - route:
    - destination:
        port:
          number: 8081
        host: demo-tomcat-for-ingress-name
EOF

curl -HHost:tomcat.shenshuxin.cn “http://node101:32318”
端口號(hào)是ingressgateway服務(wù)的nodeport
查看方式：kubectl get service -n istio-system | grep istio-ingressgateway
找到80端口對(duì)應(yīng)的nodeport即可

二、istio部署測(cè)試服務(wù)之間的調(diào)用通信

部署兩個(gè)tomcat服務(wù)pod并且配置serivce服務(wù)

注意部署的兩個(gè)deployment需要指定一下版本標(biāo)簽version: ??

apiVersion: apps/v1
kind: Deployment
metadata:
  name: demo-tomcat-for-istio-name1
  namespace: ssx
spec:
  replicas: 1
  selector:
    matchLabels:
      app: demo-tomcat-for-istio-dm
  template:
    metadata:
      labels:
        app: demo-tomcat-for-istio-dm
        version: vv11
    spec:
      containers:
          - image: 'docker.io/library/tomcat:8'
            imagePullPolicy: IfNotPresent
            name: demo-tomcat-c
            ports:
              - containerPort: 8080

---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: demo-tomcat-for-istio-name2
  namespace: ssx
spec:
  replicas: 1
  selector:
    matchLabels:
      app: demo-tomcat-for-istio-dm
  template:
    metadata:
      labels:
        app: demo-tomcat-for-istio-dm
        version: vv22
    spec:
      containers:
          - image: 'docker.io/library/tomcat:8'
            imagePullPolicy: IfNotPresent
            name: demo-tomcat-c
            ports:
              - containerPort: 8080

---
apiVersion: v1
kind: Service
metadata:
  labels:
    app: demo-tomcat-for-istio-sv-lb
  name: demo-tomcat-for-istio-name
  namespace: ssx
spec:
  ports:
    - name: tomcat8080
      port: 8081
      protocol: TCP
      targetPort: 8080
  selector:
    app: demo-tomcat-for-istio-dm
  type: ClusterIP

通過istio的虛擬服務(wù)進(jìn)行流量管理

注意這里的hosts名稱(demo-tomcat-for-istio-name)要和上面的service配置的一致，這樣istio才可以進(jìn)行流量管理。
這里設(shè)置了請(qǐng)求轉(zhuǎn)發(fā)策略，并且設(shè)置自定義響應(yīng)頭

apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
  name: demo-tomcat-istio-vs
  namespace: ssx
spec:
  hosts:
    - demo-tomcat-for-istio-name
  http:
    - headers:
        request:
          set:
            test: "true"
      route:
        - destination:
            host: demo-tomcat-for-istio-name
            subset: vv11
          weight: 10
          headers:
            response:
              set:
                ssxppp: abc
        - destination:
            host: demo-tomcat-for-istio-name
            subset: vv22
          headers:
            response:
              set:
                ssxppp: 123
          weight: 90

---

apiVersion: networking.istio.io/v1alpha3
kind: DestinationRule
metadata:
  name: demo-tomcat-istio-dr
  namespace: ssx
spec:
  host: demo-tomcat-for-istio-name
  subsets:
    - name: vv11
      labels:
        version: vv11
    - name: vv22
      labels:
        version: vv22

驗(yàn)證

隨便找一個(gè)集群中的通過istio代理的服務(wù)，執(zhí)行curl命令：

# curl -I demo-tomcat-for-istio-name.ssx:8081
HTTP/1.1 200 OK
accept-ranges: bytes
etag: W/"8-1691939281480"
last-modified: Sun, 13 Aug 2023 15:08:01 GMT
content-type: text/html
content-length: 8
date: Tue, 15 Aug 2023 00:54:15 GMT
x-envoy-upstream-service-time: 2
server: envoy
ssxppp: fs

調(diào)用的方式是service名稱.命名空間名稱:端口號(hào)。
curl -I命令是只顯示響應(yīng)頭文章來源地址http://www.zghlxwxcb.cn/news/detail-655774.html

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