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Advanced Route Rules

Important
Before Start

You should have NO virtualservice nor destinationrule (in tutorial namespace) kubectl get virtualservice{namespace-suffix} kubectl get destinationrule{namespace-suffix} if so run:

./scripts/clean.sh tutorial{namespace-suffix}

Smart routing based on user-agent header (Canary Deployment)

What is your user-agent?

Note: the "user-agent" header is added to OpenTracing baggage in the Customer service. From there it is automatically propagated to all downstream services. To enable automatic baggage propagation all intermediate services have to be instrumented with OpenTracing. The baggage header for user agent has following form baggage-user-agent: <value>.

Set recommendation to all v1

kubectl create -f istiofiles/destination-rule-recommendation-v1-v2.yml -n tutorial{namespace-suffix}
kubectl create -f istiofiles/virtual-service-recommendation-v1.yml -n tutorial{namespace-suffix}

Set Safari users to v2

kubectl replace -f istiofiles/virtual-service-safari-recommendation-v2.yml -n tutorial{namespace-suffix}

kubectl get virtualservice -n tutorial{namespace-suffix}

and test with a Safari (or even Chrome on Mac since it includes Safari in the string). Safari only sees v2 responses from recommendation

and test with a Firefox browser, it should only see v1 responses from recommendation.

There are two ways to get the URL for your browser:

You can also attempt to use the curl -A command to test with different user-agent strings.

curl -A Safari istio-ingressgateway-istio-system.{appdomain}/{path}
curl -A Firefox istio-ingressgateway-istio-system.{appdomain}/{path}

You can describe the virtualservice to see its configuration

kubectl get virtualservice -o yaml -n tutorial{namespace-suffix}

Remove the Safari rule

kubectl delete -f istiofiles/virtual-service-safari-recommendation-v2.yml -n tutorial{namespace-suffix}

Set mobile users to v2

kubectl create -f istiofiles/virtual-service-mobile-recommendation-v2.yml -n tutorial{namespace-suffix}

curl -A "Mozilla/5.0 (iPhone; U; CPU iPhone OS 4(KHTML, like Gecko) Version/5.0.2 Mobile/8J2 Safari/6533.18.5" http://istio-ingressgateway-istio-system.{appdomain}/{path}

Clean up

kubectl delete -f istiofiles/destination-rule-recommendation-v1-v2.yml -n tutorial{namespace-suffix}
kubectl delete -f istiofiles/virtual-service-mobile-recommendation-v2.yml -n tutorial{namespace-suffix}

or you can run:

./scripts/clean.sh tutorial{namespace-suffix}

Mirroring Traffic (Dark Launch)

oc get pods -l app=recommendation -n tutorial{namespace-suffix}
or
kubectl get pods -l app=recommendation -n tutorial{namespace-suffix}

You should have 2 pods for recommendation based on the steps above

kubectl get virtualservice -n tutorial{namespace-suffix}
kubectl get destinationrule

You should have NO virtualservice nor destinationrule (in tutorial namespace) kubectl get virtualservice kubectl get destinationrule if so run:

./scripts/clean.sh tutorial{namespace-suffix}

Make sure you are in the main directory of "istio-tutorial"

kubectl create -f istiofiles/destination-rule-recommendation-v1-v2.yml -n tutorial{namespace-suffix}
kubectl create -f istiofiles/virtual-service-recommendation-v1-mirror-v2.yml -n tutorial{namespace-suffix}

curl istio-ingressgateway-istio-system.{appdomain}/{path}

Check the logs of recommendation-v2

oc logs -f `oc get pods -n tutorial{namespace-suffix}|grep recommendation-v2|awk '{ print $1 }'` -c recommendation -n tutorial{namespace-suffix}
or
kubectl logs -f `oc get pods -n tutorial{namespace-suffix}|grep recommendation-v2|awk '{ print $1 }'` -c recommendation -n tutorial{namespace-suffix}

Clean up

kubectl delete -f istiofiles/destination-rule-recommendation-v1-v2.yml -n tutorial{namespace-suffix}
kubectl delete -f istiofiles/virtual-service-recommendation-v1-mirror-v2.yml -n tutorial{namespace-suffix}

or you can run:

./scripts/clean.sh tutorial{namespace-suffix}

Load Balancer

By default, you will see "round-robin" style load-balancing, but you can change it up, with the RANDOM option being fairly visible to the naked eye.

Add another v2 pod to the mix

oc scale deployment recommendation-v2 --replicas=2 -n tutorial{namespace-suffix}
or
kubectl scale deployment recommendation-v2 --replicas=2 -n tutorial{namespace-suffix}

Wait a bit (oc get pods -w to watch) and curl the customer endpoint many times

curl istio-ingressgateway-istio-system.{appdomain}/{path}

Add a 3rd v2 pod to the mix

$ oc scale deployment recommendation-v2 --replicas=3 -n tutorial{namespace-suffix}
$ oc get pods -n tutorial{namespace-suffix}

or

$ kubectl scale deployment recommendation-v2 --replicas=3 -n tutorial{namespace-suffix}
$ kubectl get pods -n tutorial{namespace-suffix}


NAME                                  READY     STATUS    RESTARTS   AGE
customer-1755156816-cjd2z             2/2       Running   0          1h
preference-3336288630-2cc6f          2/2       Running   0          1h
recommendation-v1-3719512284-bn42p   2/2       Running   0          59m
recommendation-v2-2815683430-97nnf   2/2       Running   0          43m
recommendation-v2-2815683430-d49n6   2/2       Running   0          51m
recommendation-v2-2815683430-tptf2   2/2       Running   0          33m

Wait for those 2/2 (two containers in each pod) and then poll the customer endpoint:

./scripts/run.sh http://customer-tutorial{namespace-suffix}.{appdomain}

The results should follow a fairly normal round-robin distribution pattern

customer => preference => recommendation v1 from '99634814-d2z2t': 1145
customer => preference => recommendation v2 from '2819441432-525lh': 1
customer => preference => recommendation v2 from '2819441432-rg45q': 2
customer => preference => recommendation v2 from '2819441432-bs5ck': 181
customer => preference => recommendation v1 from '99634814-d2z2t': 1146
customer => preference => recommendation v2 from '2819441432-rg45q': 3
customer => preference => recommendation v2 from '2819441432-rg45q': 4
customer => preference => recommendation v2 from '2819441432-bs5ck': 182

Now, add the Random LB DestinationPolicy

kubectl create -f istiofiles/destination-rule-recommendation_lb_policy_app.yml -n tutorial{namespace-suffix}

And you should see a different pattern of which pod is being selected

customer => preference => recommendation v2 from '2819441432-rg45q': 10
customer => preference => recommendation v2 from '2819441432-525lh': 3
customer => preference => recommendation v2 from '2819441432-rg45q': 11
customer => preference => recommendation v1 from '99634814-d2z2t': 1153
customer => preference => recommendation v1 from '99634814-d2z2t': 1154
customer => preference => recommendation v1 from '99634814-d2z2t': 1155
customer => preference => recommendation v2 from '2819441432-rg45q': 12
customer => preference => recommendation v2 from '2819441432-525lh': 4
customer => preference => recommendation v2 from '2819441432-525lh': 5
customer => preference => recommendation v2 from '2819441432-rg45q': 13
customer => preference => recommendation v2 from '2819441432-rg45q': 14

Clean up

kubectl delete -f istiofiles/destination-rule-recommendation_lb_policy_app.yml -n tutorial{namespace-suffix}

oc scale deployment recommendation-v2 --replicas=1 -n tutorial{namespace-suffix}
or
kubectl scale deployment recommendation-v2 --replicas=1 -n tutorial{namespace-suffix}