Try Traffic Shifting
Preparation
-
Make default namespace managed by Kmesh
-
Deploy bookinfo as sample application and sleep as curl client
-
Install service granularity waypoint for reviews service
The above steps could refer to Install Waypoint | Kmesh
Apply weight-based routing
Configure traffic routing to send 90% of requests to reviews v1 and 10% to reviews v2:
[root@ ~]# kubectl apply -f -<<EOF
apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
name: reviews
spec:
hosts:
- reviews
http:
- route:
- destination:
host: reviews
subset: v1
weight: 90
- destination:
host: reviews
subset: v2
weight: 10
---
apiVersion: networking.istio.io/v1alpha3
kind: DestinationRule
metadata:
name: reviews
spec:
host: reviews
trafficPolicy:
loadBalancer:
simple: RANDOM
subsets:
- name: v1
labels:
version: v1
- name: v2
labels:
version: v2
- name: v3
labels:
version: v3
EOF
Confirm that roughly 90% of the traffic go to reviews v1
[root@ ~]# kubectl exec deploy/sleep -- sh -c "for i in \$(seq 1 100); do curl -s http://productpage:9080/productpage | grep reviews-v.-; done"
<u>reviews-v1-57c85f47fb-n9llm</u>
<u>reviews-v1-57c85f47fb-n9llm</u>
<u>reviews-v1-57c85f47fb-n9llm</u>
<u>reviews-v2-64776cb9bd-grnd2</u>
<u>reviews-v1-57c85f47fb-n9llm</u>
<u>reviews-v1-57c85f47fb-n9llm</u>
...
<u>reviews-v1-57c85f47fb-n9llm</u>
<u>reviews-v1-57c85f47fb-n9llm</u>
<u>reviews-v2-64776cb9bd-grnd2</u>
<u>reviews-v1-57c85f47fb-n9llm</u>
<u>reviews-v1-57c85f47fb-n9llm</u>
<u>reviews-v2-64776cb9bd-grnd2</u>
Understanding what happened
Because default namespace has been managed by Kmesh and we have deployed a waypoint proxy for service bookinfo-reviews, so all traffic sent to service reviews will be forwarded to waypoint by Kmesh. Waypoint will send 90% of requests to reviews v1 and 10% to reviews v2 according to the route rules we set.
Cleanup
- Remove the application routing rules:
kubectl delete virtualservice reviews
kubectl delete destinationrules reviews
- If you are not planning to explore any follow-on tasks, refer to the Install Waypoint/Cleanup instructions to remove waypoint and shutdown the application.