You can manage traffic routing to different Revisions of a Knative Service by modifying the traffic spec of the Service resource.

• When you create a Knative Service, it does not have any default traffic spec settings.
• By setting the traffic spec, you can split traffic over any number of fixed Revisions, or send traffic to the latest Revision by setting latestRevision: true in the spec for a Service.
• When a tag attribute is applied to a Route, an address for the specific traffic target is created.
• In this example, you can access the staging target by accessing staging-…
• The targets for example-service-2 and example-service-3 can only be accessed using the main route, …
• When a traffic target is tagged, a new Kubernetes Service is created for that Service, so that other Services can access it within the cluster.
• From the previous example, a new Kubernetes Service called staging- will be created in the same namespace.

	apiVersion: serving.knative.dev/v1
	kind: Service
	metadata:
	name: hello
	spec:
	template:
	spec:
	containers:
	- image: gcr.io/knative-samples/helloworld-go
	ports:
	- containerPort: 8080
	env:
	- name: TARGET
	value: "World"
	---
	apiVersion: serving.knative.dev/v1
	kind: Service
	metadata:
	name: hello
	spec:
	template:
	spec:
	containers:
	- image: gcr.io/knative-samples/helloworld-go
	ports:
	- containerPort: 8080
	env:
	- name: TARGET
	value: "Knative-1"
	---
	apiVersion: serving.knative.dev/v1
	kind: Service
	metadata:
	name: hello
	spec:
	template:
	spec:
	containers:
	- image: gcr.io/knative-samples/helloworld-go
	ports:
	- containerPort: 8080
	env:
	- name: TARGET
	value: "Knative-2"
	traffic:
	- latestRevision: true
	percent: 50
	- latestRevision: false
	percent: 50
	revisionName: hello-00001
	# In the following example, the spec defines an attribute called tag:
	---
	apiVersion: serving.knative.dev/v1
	kind: Service
	metadata:
	name: example-service
	namespace: default
	spec:
	template:
	spec:
	containers:
	- image: gcr.io/knative-samples/helloworld-go
	ports:
	- containerPort: 8080
	env:
	- name: TARGET
	value: "Knative-3"
	traffic:
	- percent: 0
	revisionName: example-service-1
	tag: staging
	- percent: 40
	revisionName: example-service-2
	- percent: 60
	revisionName: example-service-3

view raw Knative-Service-Traffic-using-tags.yaml hosted with by GitHub

Rajesh Kumar

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