istio:在vs中实现ab测试和路径切割

• 此篇内容

主要目的是总结vs中的match的有关规则和在istio中如何实现路径切割(当下版本1.8.2)

实验demo

main.go

package main

import (
	"github.com/gin-gonic/gin"
	"net/http"
)

func main() {
	//1.创建路由
	r := gin.Default()
	//2.绑定路由规则，执行的函数
	r.GET("/zisefeizhu", func(context *gin.Context) {
		context.String(http.StatusOK, "Hello Zisefeizhu V1!")
// v1版本为context.String(http.StatusOK, "Hello Zisefeizhu V1!")
// v2版本为context.String(http.StatusOK, "Hello Zisefeizhu V2!")
	})
	//3.监听端口，默认8080
	r.Run(":8080")
}

Dockerfile

FROM registry.cn-shenzhen.aliyuncs.com/realibox-baseimage/golang:1.15.2-alpine as builder

WORKDIR /app

RUN go env -w GO111MODULE=on \
    && go env -w GOPROXY=https://goproxy.cn,direct

COPY go.mod go.sum ./
RUN go mod download

COPY . .

RUN CGO_ENABLED=0 go build -ldflags "-s -w"  -o server main.go


FROM alpine:latest

WORKDIR /app
COPY --from=builder /app/server /app
CMD ["./server"]

deployment.yaml

• v1 v2版本的不同之处在于version

apiVersion: apps/v1
kind: Deployment
metadata:
  name: goproject
  namespace: zisefeizhu
  labels:
    app: goproject
    version: v1
spec:
  replicas: 1
  selector:
    matchLabels:
      app: goproject
      version: v1
  template:
    metadata:
      labels:
        app: goproject
        version: v1
    spec:
      containers:
      - image: registry.cn-shenzhen.aliyuncs.com/zisefeizhu/goproject:goproject-zisefeizhu-5425
        imagePullPolicy: IfNotPresent
        livenessProbe:
          failureThreshold: 3
          initialDelaySeconds: 5
          periodSeconds: 30
          successThreshold: 1
          tcpSocket:
            port: 8080
          timeoutSeconds: 2
        name: goproject
        ports:
        - containerPort: 8080
          protocol: TCP
        readinessProbe:
          failureThreshold: 3
          initialDelaySeconds: 10
          periodSeconds: 30
          successThreshold: 1
          tcpSocket:
            port: 8080
      imagePullSecrets:
      - name: business-secret

svc.yaml

• svc中没有version标签

apiVersion: v1
kind: Service
metadata:
  labels:
    app: goproject
  name: goproject
  namespace: zisefeizhu
spec:
  ports:
  - name: http
    port: 8080
    protocol: TCP
    targetPort: 8080
  selector:
    app: goproject
  type: ClusterIP

istio配置清单

gateway.yaml

• istio-system 名称空间下
• 使用cert-manager 自动生成、续签证书

apiVersion: networking.istio.io/v1beta1
kind: Gateway
metadata:
  name: www-zisefeizhu-gateway
  namespace: istio-system
spec:
  selector:
    istio: ingressgateway
  servers:
  - hosts:
    - www.zisefeizhu.com
    port:
      name: http
      number: 80
      protocol: HTTP
    tls:
      httpsRedirect: true  # 301跳转https
  - hosts:
    - www.zisefeizhu.com
    port:
      name: https
      number: 443
      protocol: HTTPS
    tls:
      credentialName: www-zisefeizhu-com  # cert-manager生成的证书的certificate namespace
      mode: SIMPLE

dr.yaml

• 定义子集

kind: DestinationRule
apiVersion: networking.istio.io/v1alpha3
metadata:
  name: goproject
  namespace: zisefeizhu
spec:
  host: goproject
  subsets:
    - labels:
        version: v12.3
      name: v1
    - labels:
        version: v12.4
      name: v2

vr.yaml

• 重点来了

kind: VirtualService
apiVersion: networking.istio.io/v1alpha3
metadata:
  name: goproject
  namespace: zisefeizhu
spec:
  hosts:
    - www.zisefeizhu.com
  gateways:
    - istio-system/www-zisefeizhu-gateway #跨namespace 
  http:
    - match:                          #ab test 条件匹配块  这里设置的测试条件为user-agent字段，设置了两个客户地址
        - headers:                    #目前istio对于多条件的匹配需要写多个headers
            user-agent:
              exact: Mozilla/5.0   
          uri:
            prefix: /api/            #访问www.zisefeizhu.com/api/zisefeizhu 跳转到www.zisefeizhu.com/zisefeizhu 
        - headers:                   #istio 没有类似kong的 ``konghq.com/strip-path`` 注解
            user-agent:
              exact: Mozilla/6.0
          uri:
            prefix: /api/
      rewrite:                       #此处需要注意：https://github.com/istio/istio/issues/8076
        uri: /
      route:
        - destination:
            host: goproject
            subset: v2              #匹配到进入v2版本
    - match:                        #此匹配块为``切割``路由路径匹配块掩饰
        - uri:
            prefix: /api/
      rewrite:
        uri: /
      route:
        - destination:
            host: goproject
            subset: v1
    - route:                        #默认路由
        - destination:
            host: goproject
            subset: v1

验证

• 工具为：postman
• 访问地址http:www.zisefeizhu.com/api/zisefeizhu
  user-agent: Mozilla/5.0
  

user-agent: Mozilla/6.0

user-agent: Mozilla/7.0

👌！

总结

此篇需要注意点：
1、匹配块 match

匹配要激活的规则要满足的条件。单个匹配块内的所有条件都具有AND语义，而匹配块列表具有OR语义。如果任何一个匹配块成功，则匹配该规则。

2、标头操作 headers

目前对多条件的匹配似乎还不能写在一个headers中需要分开写

3、路由切割

istio目前对于路由切割似乎没有类似kong 和nginxde的方法

ps：kong nginx：底层一样

使用rewrite重写可以做到