smi-trafficsplit

Using SMI spec TrafficSplit

Setup

Prerequisite

• kubectl installed.
• Working Kubernetes cluster.

Install Istio

Download manifests as mentioned in upstream docs.

curl -L https://git.io/getLatestIstio | ISTIO_VERSION=1.1.6 sh -

Install Istio on Kubernetes

cd istio-1.1.6
kubectl apply -f install/kubernetes/istio-demo-auth.yaml

NOTE: Above apply might sometimes give errors like unable to recognize "install/kubernetes/istio-demo-auth.yaml": no matches for kind "DestinationRule" in version "networking.istio.io/v1alpha3", this is most likely because the CRDs are not registered yet and apiserver will reconcile it. Try running the above kubectl apply ... again.

Install SMI CRDs and Operator to work with Istio

cd $GOPATH/src/github.com/deislabs/smi-adapter-istio/docs/smi-trafficsplit
kubectl apply -f https://raw.githubusercontent.com/deislabs/smi-adapter-istio/master/deploy/crds/crds.yaml
kubectl apply -f https://raw.githubusercontent.com/deislabs/smi-adapter-istio/master/deploy/operator-and-rbac.yaml

Demo

Deploy v1 of Bookinfo application

kubectl create ns smi-demo
kubectl label namespace smi-demo istio-injection=enabled
kubectl -n smi-demo apply -f manifests/00-bookinfo-setup.yaml
kubectl -n smi-demo apply -f manifests/01-deploy-v1.yaml

Verify the application works

Run following command to get the URL to acces the application.

echo "http://$(kubectl -n istio-system get service istio-ingressgateway -o jsonpath='{.status.loadBalancer.ingress[0].ip}')/productpage"

It generally looks like following: http://52.168.69.51/productpage.

Visit above URL in the browser and you won't see any ratings since the reviews v1 does not call ratings service at all.

Create TrafficSplit for v1

kubectl -n smi-demo apply -f manifests/02-traffic-split-1000-0.yaml

Deploy v2 of reviews application

kubectl -n smi-demo apply -f manifests/03-deploy-v2.yaml

Verify that the traffic is still only sent to version v1 of the application even though there is v2 version deployed. Until you perform the next step no traffic will be sent to the v2.

Update TrafficSplit to send 10% of traffic

kubectl -n smi-demo apply -f manifests/04-traffic-split-900-100.yaml

Refresh browser multiple times to see that the traffic is sent to version v1 of reviews micro-service 90% of the time and to v2, 10% of the time. Verify that application works fine and increase the traffic for v2.

Update TrafficSplit to send 25% of traffic

kubectl -n smi-demo apply -f manifests/05-traffic-split-750-250.yaml

Refresh browser multiple times to see that the traffic is sent to version v1 of reviews micro-service 75% of the time and to v2, 25% of the time. Verify that application works fine and increase the traffic for v2.

Update TrafficSplit to send 80% of traffic

kubectl -n smi-demo apply -f manifests/06-traffic-split-200-800.yaml

Refresh browser multiple times to see that the lesser traffic is sent to version v1 of reviews micro-service which is 20% of the time and to v2, 80% of the time. Verify that application still works fine and now is the right time to send entire traffic to v2.

Update TrafficSplit to send 100% of traffic

kubectl -n smi-demo apply -f manifests/07-traffic-split-0-1000.yaml

Refresh browser and you will see that the traffic is sent only to version v2 of the reviews application.

Delete old version of application

kubectl -n smi-demo delete -f manifests/01-deploy-v1.yaml

Get rid of the TrafficSplit object

kubectl -n smi-demo delete trafficsplit reviews-rollout