该任务演示怎样缓慢迁移流量从一个版本到另一个版本，如从一个老版本到新版本升级。你能配置流量到哪个版本服务的百分比。
如下演示中将会发送50%到reviews-v1，50%到reviews-v3，最后合并100%流量到reviews-v3。
所有流量路由到每个服务的v1版本
- virtual-service-all-v1.yaml
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| apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
name: productpage
spec:
hosts:
- productpage
http:
- route:
- destination:
host: productpage
subset: v1
---
apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
name: reviews
spec:
hosts:
- reviews
http:
- route:
- destination:
host: reviews
subset: v1
---
apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
name: ratings
spec:
hosts:
- ratings
http:
- route:
- destination:
host: ratings
subset: v1
---
apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
name: details
spec:
hosts:
- details
http:
- route:
- destination:
host: details
subset: v1
---
|
然后访问 http://bookinfo.example.com/productpage
不论如何刷新，都不会显示星标
将流量分别路由50%到review的v1和v3版本
- virtual-service-reviews-50-v3.yaml
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| apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
name: reviews
spec:
hosts:
- reviews
http:
- route:
- destination:
host: reviews
subset: v1
weight: 50
- destination:
host: reviews
subset: v3
weight: 50
|
然后访问 http://bookinfo.example.com/productpage
多次刷新，大约50%几率显示红色图标，50%无星图标
将流量全部路由到reviews的v3版本
- virtual-service-reviews-v3.yaml
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| apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
name: reviews
spec:
hosts:
- reviews
http:
- route:
- destination:
host: reviews
subset: v3
|
然后访问 http://bookinfo.example.com/productpage
多次刷新，都显示红色图标
参考资料