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Knative Install on a Kubernetes Cluster

This guide walks you through the installation of the latest version of Knative using pre-built images.

Before you begin

Knative requires a Kubernetes cluster v1.11 or newer with the MutatingAdmissionWebhook admission controller enabled. kubectl v1.10 is also required. This guide assumes that you've already created a Kubernetes cluster which you're comfortable installing alpha software on.

This guide assumes you are using bash in a Mac or Linux environment; some commands will need to be adjusted for use in a Windows environment.

Installing Istio

Knative depends on Istio. Istio workloads require privileged mode for Init Containers.

  1. Install Istio:

    kubectl apply --filename https://github.com/knative/serving/releases/download/v0.3.0/istio-crds.yaml && \
    kubectl apply --filename https://github.com/knative/serving/releases/download/v0.3.0/istio.yaml

    Note: the resources (CRDs) defined in the istio-crds.yamlfile are also included in the istio.yaml file, but they are pulled out so that the CRD definitions are created first. If you see an error when creating resources about an unknown type, run the second kubectl apply command again.

  2. Label the default namespace with istio-injection=enabled:

    kubectl label namespace default istio-injection=enabled
  3. Monitor the Istio components until all of the components show a STATUS of Running or Completed:

    kubectl get pods --namespace istio-system

It will take a few minutes for all the components to be up and running; you can rerun the command to see the current status.

Note: Instead of rerunning the command, you can add --watch to the above command to view the component's status updates in real time. Use CTRL + C to exit watch mode.

Installing Knative

The following commands install all available Knative components. To customize your Knative installation, see Performing a Custom Knative Installation.

  1. Run the kubectl apply command to install Knative and its dependencies:
    kubectl apply --filename https://github.com/knative/serving/releases/download/v0.3.0/serving.yaml \
    --filename https://github.com/knative/build/releases/download/v0.3.0/release.yaml \
    --filename https://github.com/knative/eventing/releases/download/v0.3.0/release.yaml \
    --filename https://github.com/knative/eventing-sources/releases/download/v0.3.0/release.yaml
  2. Monitor the Knative components until all of the components show a STATUS of Running:
    kubectl get pods --namespace knative-serving
    kubectl get pods --namespace knative-build
    kubectl get pods --namespace knative-eventing
    kubectl get pods --namespace knative-sources
    kubectl get pods --namespace knative-monitoring

What's next

Now that your cluster has Knative installed, you can see what Knative has to offer.

To deploy your first app with Knative, follow the step-by-step Getting Started with Knative App Deployment guide.

To get started with Knative Eventing, pick one of the Eventing Samples to walk through.

To get started with Knative Build, read the Build README, then choose a sample to walk through.