Istio helloworld

创建3个dep

depv1.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: versionv1
  namespace: lizhe
spec: 
  replicas: 1
  selector:
    matchLabels:
      app: nginx
      version: v1
  template:
    metadata:
      labels:
        app: nginx
        version: v1
    spec: 
      containers:
      - name: versionv1
        image: libaibai/version:v1
        imagePullPolicy: IfNotPresent
        ports:
        - containerPort: 80
          name: http
          protocol: TCP

depv2.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: versionv2
  namespace: lizhe
spec: 
  replicas: 1
  selector:
    matchLabels:
      app: nginx
      version: v2
  template:
    metadata:
      labels:
        app: nginx
        version: v2
    spec: 
      containers:
      - name: versionv2
        image: libaibai/version:v2
        imagePullPolicy: IfNotPresent
        ports:
        - containerPort: 80
          name: http
          protocol: TCP

depv3.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: versionv3
  namespace: lizhe
spec: 
  replicas: 1
  selector:
    matchLabels:
      app: nginx
      version: v3
  template:
    metadata:
      labels:
        app: nginx
        version: v3
    spec: 
      containers:
      - name: versionv3
        image: libaibai/version:v3
        imagePullPolicy: IfNotPresent
        ports:
        - containerPort: 80
          name: http
          protocol: TCP

svc.yaml

apiVersion: v1
kind: Service
metadata:
  name: nginx-service
  namespace: lizhe
  labels:
    app: nginx
spec:
  ports:
  - port: 80
    name: http
  selector:
    app: nginx

为了测试我会在这里再启动一个 nginx

需要特别注意的是，这个nginx也需要注入istio，否则无法以 nginx-service 做为路径, 你可能已经注意到了，这里不是使用的标准 Kubernetes DNS格式

然后我们试着把流量单独导向 v2

dr.yaml

apiVersion: networking.istio.io/v1alpha3
kind: DestinationRule
metadata:
  name: nginx-desrule 
  namespace: lizhe
spec: 
  host: nginx-service
  subsets:
  - name: v1 
    labels: 
      version: v1
  - name: v2
    labels: 
      version: v2
  - name: v3
    labels: 
      version: v3

vs.yaml

apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
  name: nginx-default-v2
  namespace: lizhe
spec: 
  hosts:
  - nginx-service
  http:
  - route: 
    - destination: 
        host: nginx-service
        subset: v2

Istio已用新的Gateway和VirtualServices资源替换了熟悉的Ingress资源。它们协同工作，将流量路由到网格中。在网格内部，不需要Gateway，因为服务可以通过集群本地服务名称相互访问。