Traffic Management Using Istio
Before you begin
You are familiar with the following Istio concepts:
How CD-as-a-Service shapes traffic
In the following example, you define a CD-as-a-Service deployment that uses a VirtualService and DestinationRoute:
|CD-as-a-Service Deployment (deploy.yaml)||Istio Resources (istio-resources.yaml)|
|Deployment Field (deploy.yaml)||Deploy Line||Istio Resources Field (istio-resources.yaml)||Istio Line|
When you deploy your app, CD-as-a-Service modifies your VirtualService and DestinationRule, setting weights for
canary subsets based on the weights specified in your deployment strategy. CD-as-a-Service also adds the
armory-pod-template-hash label to the DestinationRule subsets for routing traffic to the pods of each ReplicaSet.
apiVersion: networking.istio.io/v1alpha3 kind: VirtualService metadata: name: reviews spec: hosts: - reviews http: - route: - destination: host: reviews.istiodemo.svc.cluster.local subset: stable weight: 10 - destination: host: reviews.istiodemo.svc.cluster.local subset: canary weight: 90 name: http-route-reviews --- apiVersion: networking.istio.io/v1alpha3 kind: DestinationRule metadata: name: reviews spec: host: reviews.istiodemo.svc.cluster.local subsets: - name: stable labels: app: reviews armory-pod-template-hash: gc6647 - name: canary labels: app: reviews armory-pod-template-hash: cd6648
At the end of the deployment, CD-as-a-Service removes the lines it added so the resources look the same as before the deployment began.
You have two options for deploying your VirtualService and DestinationRule Istio resources:
- Separately, before your CD-as-a-Service deployment
- As part of your CD-as-a-Service deployment, included in the same directory as your app manifest
You can use a VirtualService that has more than one route as long as the route is named within the resource and specified in your deployment file.
CD-as-a-Service supports both FQDN and short names in the
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Last modified January 13, 2023: (d790310)