1.安装istio

a 下载istioctl安装

下载
$ wget https://github.com/istio/istio/releases/download/1.7.3/istio-1.7.3-linux-amd64.tar.gz
配置
tar zxf istio-1.7.3-linux-amd64.tar.gz
cd istio-1.7.3 && cp bin/istioctl /usr/local/bin

b.安装iostio

#指定下载的镜像地址进行安装
istioctl install --set profile=demo --set values.pilot.image="harbor.assistfc.com/middleware/pilot:1.7.3" --set values.proxy.image="harbor.assistfc.com/middleware/proxyv2:1.7.3"
#效果如下
root@test-k8s-master1:~# kubectl get pod -n istio-system
NAME                                    READY   STATUS    RESTARTS   AGE
istio-egressgateway-7f6bd48c74-t9q6g    1/1     Running   0          6m16s
istio-ingressgateway-69f5465fff-szfql   1/1     Running   0          6m16s
istiod-7c57888-65564                    1/1     Running   0          6m26s

c查看

# 查看提供的profile类型
$ istioctl profile list

# 获取kubernetes的yaml：
$ istioctl manifest generate --set profile=demo > istio-kubernetes-manifest.yaml  #可查看要安装镜像image

d 卸载命令

$ istioctl manifest generate --set profile=demo | kubectl delete -f -

实践网络分流的权重

1.资源清单

后端服务

#后端一
apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    service: bill-service
    version: v1
  name: bill-service-v1
  namespace: istio-demo
spec:
  replicas: 1
  selector:
    matchLabels:
      service: bill-service
      version: v1
  template:
    metadata:
      labels:
        service: bill-service
        version: v1
    spec:
      containers:
      - image: harbor.assistfc.com/middleware/nginx:alpine
        name: bill-service
        command: ["/bin/sh", "-c", "echo 'this is bill-service-v1'>/usr/share/nginx/html/index.html;nginx -g 'daemon off;'"]
#后端2
apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    service: bill-service
    version: v2
  name: bill-service-v2
  namespace: istio-demo
spec:
  replicas: 1
  selector:
    matchLabels:
      service: bill-service
      version: v2
  template:
    metadata:
      labels:
        service: bill-service
        version: v2
    spec:
      containers:
      - image: harbor.assistfc.com/middleware/nginx:alpine
        name: bill-service
        command: ["/bin/sh", "-c", "echo 'this is bill-service-v2'>/usr/share/nginx/html/index.html;nginx -g 'daemon off;'"]
#service   %50均分流量

apiVersion: v1
kind: Service
metadata:
  labels:
    service: bill-service
  name: bill-service
  namespace: istio-demo
spec:
  ports:
  - name: http
    port: 9999
    protocol: TCP
    targetPort: 80
  selector:
    service: bill-service
  type: ClusterIP

#实现90%的流量 到v1 10%到v2

需要通过istio的两个新的资源类型：VirtualService和DestinationRule实现

具体如下

使用Istio 注入sidecar

$ istioctl kube-inject -f service-tomecat-v2.yaml|kubectl apply -f -
$ istioctl kube-inject -f service-tomecat-v1.yaml|kubectl apply -f -
$ istioctl kube-inject -f front-tomecat.yaml|kubectl apply -f -

注入网络接管服务 proxyv2:1.7.3

查看容器的状态

#会启动新的容器
root@test-k8s-master1:~/istio-demo# kubectl get pod -n istio-demo
NAME                               READY   STATUS    RESTARTS   AGE
bill-service-v1-86754676d6-qcstq   2/2     Running   0          86m
bill-service-v2-777d8d98c7-gzhth   2/2     Running   0          85m
front-tomcat-v1-9c866f69b-m56kw    2/2     Running   0          88m

#配置destination文件和vertuleservice

apiVersion: networking.istio.io/v1alpha3
kind: DestinationRule
metadata:
  name: dest-bill-service
  namespace: istio-demo
spec:
  host: bill-service
  subsets:
  - name: v1
    labels:
      version: v1
  - name: v2
    labels:
      version: v2

apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
  name: vs-bill-service
  namespace: istio-demo
spec:
  hosts:
  - bill-service
  http:
  - name: bill-service-route
    route:
    - destination:
        host: bill-service
        subset: v1
      weight: 90
    - destination:
        host: bill-service
        subset: v2
      weight: 10

ervice:9999
this is bill-service-v1
root@test-k8s-master1:~/istio-demo# kubectl exec -it front-tomcat-v1-9c866f69b-m56kw  -n istio-demo -c front-tomcat  -- curl -s bill-service:9999
this is bill-service-v1
root@test-k8s-master1:~/istio-demo# kubectl exec -it front-tomcat-v1-9c866f69b-m56kw  -n istio-demo -c front-tomcat  -- curl -s bill-service:9999
this is bill-service-v1
root@test-k8s-master1:~/istio-demo# kubectl exec -it front-tomcat-v1-9c866f69b-m56kw  -n istio-demo -c front-tomcat  -- curl -s bill-service:9999
this is bill-service-v2
root@test-k8s-master1:~/istio-demo# kubectl exec -it front-tomcat-v1-9c866f69b-m56kw  -n istio-demo -c front-tomcat  -- curl -s bill-service:9999
this is bill-service-v1

以上为测试结果实现90%和10%的流量的切换