Clever Geek Handbook

Implementación de Canary en Kubernetes # 3: Istio

Uso de Istio + Kiali para ejecutar y renderizar una implementación Canary







Artículos de este ciclo



  1. Implementación de Canary en Kubernetes n. ° 1: Gitlab CI
  2. Implementación de Canary en Kubernetes # 2: Implementaciones de Argo
  3. (Este artículo)
  4. Implementación de Canary con Jenkins-X, Istio y Flagger


Despliegue canario



, , Canary deployments Kubernetes.



Istio



, , Istio. , .







: istio-proxy.



frontend-nginx backend python. nginx backend . yamls:







, . readme .



Deployment



Deployment , 2 , Istio sidecar :







Istio Gateway Loadbalancer namespace istio-system:







IP, , frontend backend :



while true; do curl -s --resolve 'frontend.istio-test:80:35.242.202.152' frontend.istio-test; sleep 0.1; done



frontend.istio-test hosts .



Mesh Kiali



Istio Tracing, Grafana, Prometheus Kiali ( . readme ). , Kiali :



istioctl dashboard kiali # admin:admin





Kiali Mesh



, 100% frontend service, label v1, nginx-, backend service, backend label v1.



Kiali Istio Mesh. .



Canary Deployment



k8s deployments, v1 v2. Istio v2.



1: 10%



VirtualService istio.yaml:



apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
  name: backend
  namespace: default
spec:
  gateways: []
  hosts:
  - "backend.default.svc.cluster.local"
  http:
  - match:
    - {}
    route:
    - destination:
        host: backend.default.svc.cluster.local
        subset: v1
        port:
          number: 80
      weight: 90
    - destination:
        host: backend.default.svc.cluster.local
        subset: v2
        port:
          number: 80
      weight: 10






, 10% v2.



2: 50%



50%:



apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
  name: backend
  namespace: default
spec:
...
    - destination:
        host: backend.default.svc.cluster.local
        subset: v1
        port:
          number: 80
      weight: 50
    - destination:
        host: backend.default.svc.cluster.local
        subset: v2
        port:
          number: 80
      weight: 50






3: 100%



Canary deployment v2:







Canary



, v2 10% . , v2, , ?



, HTTP :



apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
  name: backend
  namespace: default
spec:
  gateways: []
  hosts:
  - "backend.default.svc.cluster.local"
  http:
  - match:
    - headers:
        canary:
          exact: "canary-tester"
    route:
    - destination:
        host: backend.default.svc.cluster.local
        subset: v2
        port:
          number: 80
      weight: 100
  - match:
    - {}
    route:
    - destination:
        host: backend.default.svc.cluster.local
        subset: v1
        port:
          number: 80
      weight: 90
    - destination:
        host: backend.default.svc.cluster.local
        subset: v2
        port:
          number: 80
      weight: 10


curl v2 :







1/10:







Canary



, v2 frontend backend. , 10% v2:







, frontend v1 v2 1/10 backend v1 v2.



frontend-v2 backend-v2, v1? 1/10 frontend, backend-v2 sourceLabels :



apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
  name: backend
  namespace: default
spec:
  gateways: []
  hosts:
  - "backend.default.svc.cluster.local"
  http:
...
  - match:
    - sourceLabels:
        app: frontend
        version: v2
    route:
    - destination:
        host: backend.default.svc.cluster.local
        subset: v2
        port:
          number: 80
      weight: 100


, :







Canary



Canary deployment , k8s deployments. , . , .



Istio . , , HPAs (Horizontal Pod Autoscalers — ) Canary .





Istio Kiali . Spinnaker Istio Canary-.



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