The helloworld Service had a spec.runLatest field which serves all the traffic to the latest revision created form the Service’s revisionTemplate field.

To test out the effects of a new version of your application, you will need to run multiple versions of your applications and route a portion of your traffic to the new “canary” version you are testing. This practice is called “blue-green deployment”.

Knative Serving offers the Revision API, which tracks the changes to application configuration, and the Route API, which lets you split the traffic to multiple revisions.

In this exercise you will:

1. Deploy a “blue” Service version in runLatest mode.
2. Update Service with “green” configuration and change mode to release to split traffic between two revisions.

Rajesh Kumar

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