Canary Deployment in Kubernetes # 3: Istio

Using Istio + Kiali to Run and Render a Canary Deploy

Articles in this cycle

Canary deployment

, , 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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