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Chapter 3. Knative Serving
Knative Serving supports developers who want to create, deploy, and manage cloud-native applications. It provides a set of objects as Kubernetes custom resource definitions (CRDs) that define and control the behavior of serverless workloads on an OpenShift Container Platform cluster.
Developers use these CRDs to create custom resource (CR) instances that can be used as building blocks to address complex use cases. For example:
- Rapidly deploying serverless containers.
- Automatically scaling pods.
3.1. Knative Serving resources
- Service
-
The
service.serving.knative.devCRD automatically manages the life cycle of your workload to ensure that the application is deployed and reachable through the network. It creates a route, a configuration, and a new revision for each change to a user created service, or custom resource. Most developer interactions in Knative are carried out by modifying services. - Revision
-
The
revision.serving.knative.devCRD is a point-in-time snapshot of the code and configuration for each modification made to the workload. Revisions are immutable objects and can be retained for as long as necessary. - Route
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The
route.serving.knative.devCRD maps a network endpoint to one or more revisions. You can manage the traffic in several ways, including fractional traffic and named routes. - Configuration
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The
configuration.serving.knative.devCRD maintains the desired state for your deployment. It provides a clean separation between code and configuration. Modifying a configuration creates a new revision.
