VS流量管理

Istio入流量方向

• Client -> IngressController -> Gateway -> VirtualService -> Service -> workload

1.创建网关

apiVersion: networking.istio.io/v1alpha3
kind: Gateway
metadata:
  name: mygw
spec:
  selector:
    istio: ingressgateway # use istio default controller
  servers:
  - port:
      number: 80
      name: http
      protocol: HTTP
    hosts:
    - "aa.xiebo.pro"

2.VirtualService用法

2.1.基础用法

apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
  name: myvs
spec:
  hosts:
  - "aa.xiebo.pro"
  gateways:
  - mygw
  http:
  - route:
    - destination:
        host: svc1

2.2.前缀匹配转发访问目录

apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
  name: myvs
spec:
  hosts:
  - "aa.xiebo.pro"
  gateways:
  - mygw
  http:
  - name: aaa
    match:
      - uri:
          prefix: /demo1
    route:
    - destination:
        host: svc1
  - name: bbb
    match:
      - uri:
          prefix: /demo2
    route:
    - destination:
        host: svc2

2.3.权重转发负载

apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
  name: myvs
spec:
  hosts:
  - "aa.xiebo.pro"
  gateways:
  - mygw
  http:
  #weight值之和必须为100
  - route:
    - destination:
        host: svc1
      weight: 50
    - destination:
        host: svc2
      weight: 50

2.4.路径重写

apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
  name: myvs
spec:
  hosts:
  - "aa.xiebo.pro"
  gateways:
  - mygw
  http:
  - match:
    - uri: 
        prefix: /demo1
    rewrite: 
      uri: /demo2
    route:
    - destination:
        host: svc1

2.5.转发到其它命名空间

#创建ns2的VS
apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
  name: vs1
spec:
  http:
  - route:
    - destination:
        #host: svc1.ns2.svc.cluster.local
         host: svc1

#配置ns1的VS转发到ns2的VS
apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
  name: myvs
spec:
  hosts:
  - "aa.xiebo.pro"
  gateways:
  - mygw
  http:
  - name: aaa
    match:
    - uri: 
        prefix: /demo1
    delegate:
      name: vs1
      namespace: ns2
  - route:
    - destination:
        host: svc1

2.6.基于http header

apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
  name: myvs
spec:
  hosts:
  - "aa.xiebo.pro"
  gateways:
  - mygw
  http:
  - name: aaa
    match:
    - headers:
        User-Agent:
          regex: .*(Chrome/([\d.]+)).*
    route:
    - destination:
        host: svc2
  - route:
    - destination:
        host: svc1