第一步：以nginx的容器为测试
build.sh脚本内容如下。

#!/bin/sh

path_current=`pwd`
path_script=$(cd "$(dirname "$0")"; pwd)

ver=$1
if [ "$ver" == "" ]; then
   echo "should like: build.sh v2"
   exit
fi

docker rmi ngtest:${ver}
docker stop mynginx
docker rm mynginx
docker run --name mynginx -d nginx:1.17.8
docker cp ./default.conf mynginx:/etc/nginx/conf.d/default.conf && docker commit mynginx ngtest:${ver}
docker stop mynginx
docker rm mynginx
echo "----------------list ngtest image---------------------"&&docker images|grep ngtest

与脚本同级目录下的default.conf配置文件如下：

server {
    listen       80;
    listen  [::]:80;
    server_name  localhost;

    location /test {
        default_type application/json;
        return 200 "vm4 - v2 - time:$date_gmt - remote:$remote_addr";
    }

    location / {
        root   /usr/share/nginx/html;
        index  index.html index.htm;
    }

    error_page   500 502 503 504  /50x.html;
    location = /50x.html {
        root   /usr/share/nginx/html;
    }
}

第二步：

apiVersion: networking.istio.io/v1alpha3
kind: Gateway
metadata:
  name: ngtest-gateway
spec:
  selector:
    istio: ingressgateway # use istio default controller
  servers:
  - port:
      number: 80
      name: http
      protocol: HTTP
    hosts:
    - "mynginx.cn"
-----------------------------------------
apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
  name: ngtest
spec:
  hosts:
  - "ngtestsvc"
  gateways:
  - ngtest-gateway
  http:
  - match:
    - uri:
        prefix: /
    route:
    - destination:
        host: ngtestsvc
        port:
          number: 1080
        subset: v1
      weight: 90
    - destination:
        host: ngtestsvc
        port:
          number: 1080
        subset: v2
      weight: 10

---------------------
apiVersion: v1
kind: Service
metadata:
  name: ngtestsvc
spec:
  type: NodePort
  ports:
  - port: 1080
    targetPort: 80
    name: http
  selector:
    app: ngtestapp

-------------------------------------
apiVersion: apps/v1
kind: Deployment
metadata:
  name: ngtestapp.v1
spec:
  replicas: 3
  selector:
    matchLabels:
      app: ngtestapp
      version: v1
  template:
    metadata:
      labels:
        app: ngtestapp
        version: v1
    spec:
      containers:
      - name: ngtest
        image: ngtest:v1
        imagePullPolicy: IfNotPresent
        ports:
        - containerPort: 80
        env:
        - name: DO_NOT_ENCRYPT
          value: "true"

------------------------------------
apiVersion: apps/v1
kind: Deployment
metadata:
  name: ngtestapp.v2
spec:
  replicas: 3
  selector:
    matchLabels:
      app: ngtestapp
      version: v2
  template:
    metadata:
      labels:
        app: ngtestapp
        version: v2
    spec:
      containers:
      - name: ngtest
        image: ngtest:v2
        imagePullPolicy: IfNotPresent
        ports:
        - containerPort: 80
        env:
        - name: DO_NOT_ENCRYPT
          value: "true"

Kubernetes的service有三种类型：ClusterIP，NodePort，LoadBalancer

apiVersion: v1
kind: Service
metadata:
  name: ngtestsvc
spec:
  type: NodePort  【不指定，默认为ClusterIP】
  ports:
  - port: 1080
    targetPort: 80  【不指定时，默认与port一致】
    #nodePort: 31080 【该端口被强制划分为30000~50000之间，建议由系统自动分配，因为它会产生冲突的。】
    name: http
  selector:
    app: ngtestapp