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net-kourier

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Chainguard Container for net-kourier

Knative Ingress implementation using Envoy

Chainguard Containers are regularly-updated, secure-by-default container images.

Download this Container Image

For those with access, this container image is available on cgr.dev:

docker pull cgr.dev/ORGANIZATION/net-kourier:latest

Be sure to replace the ORGANIZATION placeholder with the name used for your organization's private repository within the Chainguard Registry.

Compatibility Notes

The net-kourier image is a Chainguard-built image for the official Knative net-kourier ingress controller. This image maintains full compatibility with upstream Knative image.

There are no breaking changes from the upstream Knative net-kourier functionality.

Prerequisites

To use the net-kourier image, you'll need:

  • A Kubernetes cluster (version 1.24 or later)
  • Knative Serving installed
  • kubectl configured to communicate with your cluster

For detailed installation requirements, refer to the official Knative documentation.

Getting Started

The net-kourier image serves as the ingress controller for Knative Serving. It's typically deployed as part of the Knative networking layer rather than run directly.

Installing with Knative Serving

First, install Knative Serving CRDs and core components:

kubectl apply -f https://github.com/knative/serving/releases/latest/download/serving-crds.yaml
kubectl apply -f https://github.com/knative/serving/releases/latest/download/serving-core.yaml

Next, install the Kourier networking layer, with Chainguard image:

wget https://github.com/knative/net-kourier/releases/latest/download/kourier.yaml
yq eval '(select(.kind == "Deployment" and .metadata.name == "net-kourier-controller") | .spec.template.spec.containers[0].image) = cgr.dev/ORGANIZATION/net-kourier:latest' -i kourier.yaml
kubectl apply -f kourier.yaml

Configure Knative to use Kourier as the ingress:

kubectl patch configmap/config-network \
  --namespace knative-serving \
  --type merge \
  --patch '{"data":{"ingress.class":"kourier.ingress.networking.knative.dev"}}'

Now you can verify the installation and check that the Kourier components are running:

kubectl get pods -n knative-serving
kubectl get pods -n kourier-system

What are Chainguard Containers?

Chainguard's free tier of Starter container images are built with Wolfi, our minimal Linux undistro.

All other Chainguard Containers are built with Chainguard OS, Chainguard's minimal Linux operating system designed to produce container images that meet the requirements of a more secure software supply chain.

The main features of Chainguard Containers include:

For cases where you need container images with shells and package managers to build or debug, most Chainguard Containers come paired with a development, or -dev, variant.

In all other cases, including Chainguard Containers tagged as :latest or with a specific version number, the container images include only an open-source application and its runtime dependencies. These minimal container images typically do not contain a shell or package manager.

Although the -dev container image variants have similar security features as their more minimal versions, they include additional software that is typically not necessary in production environments. We recommend using multi-stage builds to copy artifacts from the -dev variant into a more minimal production image.

Need additional packages?

To improve security, Chainguard Containers include only essential dependencies. Need more packages? Chainguard customers can use Custom Assembly to add packages, either through the Console, chainctl, or API.

To use Custom Assembly in the Chainguard Console: navigate to the image you'd like to customize in your Organization's list of images, and click on the Customize image button at the top of the page.

Learn More

Refer to our Chainguard Containers documentation on Chainguard Academy. Chainguard also offers VMs and Libraries — contact us for access.

Trademarks

This software listing is packaged by Chainguard. The trademarks set forth in this offering are owned by their respective companies, and use of them does not imply any affiliation, sponsorship, or endorsement by such companies.

Licenses

Chainguard container images contain software packages that are direct or transitive dependencies. The following licenses were found in the "latest" tag of this image:

  • Apache-2.0

  • LGPL-2.1-or-later

  • MIT

  • MPL-2.0

For a complete list of licenses, please refer to this Image's SBOM.

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