Installing Knative without internet

Is it possible to install Knative without internet? Understand that it required K8 to pull images from internet during installation. Can I download all the necessary images to a private repository and apply yaml to do installation?

If you can pre-pull all images used in the Knative core, then the answer is yes: you can install and run Knative offline.

It's quite a few images, but you should be able to find all of them easily by inspecting the installation manifests from the YAML-based installation section of the Knative documentation.

Here are a few examples of images that compose the Knative core (as of Knative v0.22):

Serving

• Serving controller
• Serving webhook
• Serving activator
• Serving autoscaler
• Serving queue sidecar
• Ingress installation. For example, Kourier needs:
  • Envoy proxy
  • Kourier controller

Eventing

• Eventing controller
• Eventing webhook
• Eventing broker controller
• Eventing broker ingress
• Eventing broker filter
• Eventing in-memory channel controller
• Eventing in-memory channel dispatcher

Note: although the image attributes I referenced above are in the format ko://..., the release manifests documented in the YAML-based installation section of the Knative documentation contain actual image URLs.