docs/install/Knative-with-any-k8s.md

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 v1.10 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://raw.githubusercontent.com/knative/serving/v0.2.2/third_party/istio-1.0.2/istio.yaml
   

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 components

You can install the Knative Serving and Build components together, or Build on its own.

Installing Knative Serving and Build components

1. Run the kubectl apply command to install Knative and its dependencies:

   kubectl apply --filename https://github.com/knative/serving/releases/download/v0.2.2/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
   

Installing Knative Build only

1. Run the kubectl apply command to install Knative Build and its dependencies:

   kubectl apply --filename https://raw.githubusercontent.com/knative/serving/v0.2.2/third_party/config/build/release.yaml
   

2. Monitor the Knative Build components until all of the components show a STATUS of Running:

   kubectl get pods --namespace knative-build
   
   

Just as with the Istio components, it will take a few seconds for the Knative components to be up and running; you can rerun the kubectl get 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.

You are now ready to deploy an app or create a build in your new Knative cluster.

Deploying an app

Now that your cluster has Knative installed, you're ready to deploy an app.

You have two options for deploying your first app:

• You can follow the step-by-step Getting Started with Knative App Deployment guide.

• You can view the available sample apps and deploy one of your choosing.