Install on Azure Kubernetes Service (AKS)

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

You can find guides for other platforms here.

Before you begin

Knative requires a Kubernetes cluster v1.11 or newer. kubectl v1.10 is also required. This guide walks you through creating a cluster with the correct specifications for Knative on Azure Kubernetes Service (AKS).

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 the Azure CLI

  1. If you already have azure cli version 2.0.41 or later installed, you can skip to the next section and install kubectl

Install az by following the instructions for your operating system. See the full installation instructions if yours isn’t listed below. You will need az cli version 2.0.37 or greater.

MacOS

brew install azure-cli

Ubuntu 64-bit

  1. Add the azure-cli repo to your sources: console echo "deb [arch=amd64] https://packages.microsoft.com/repos/azure-cli/ wheezy main" | \ sudo tee /etc/apt/sources.list.d/azure-cli.list
  2. Run the following commands to install the Azure CLI and its dependencies: console sudo apt-key adv --keyserver packages.microsoft.com --recv-keys 52E16F86FEE04B979B07E28DB02C46DF417A0893 sudo apt-get install apt-transport-https sudo apt-get update && sudo apt-get install azure-cli

Installing kubectl

  1. If you already have kubectl, run kubectl version to check your client version. If you have kubectl v1.10 installed, you can skip to the next section and create an AKS cluster
az aks install-cli

Cluster Setup

Now that we have all the tools, we need a Kubernetes cluster to install Knative.

Configure your Azure account

First let’s identify your Azure subscription and save it for use later.

  1. Run az login and follow the instructions in the command output to authorize az to use your account
  2. List your Azure subscriptions: bash az account list -o table

Create a Resource Group for AKS

To simplify the command lines for this walkthrough, we need to define a few environment variables. First determine which region you’d like to run AKS in, along with the resource group you’d like to use.

  1. Set RESOURCE_GROUP and LOCATION variables:
   export LOCATION=eastus
   export RESOURCE_GROUP=knative-group
   export CLUSTER_NAME=knative-cluster
  1. Create a resource group with the az cli using the following command if you are using a new resource group. bash az group create --name $RESOURCE_GROUP --location $LOCATION

Create a Kubernetes cluster using AKS

Next we will create a managed Kubernetes cluster using AKS. To make sure the cluster is large enough to host all the Knative and Istio components, the recommended configuration for a cluster is:

  • Kubernetes version 1.11 or later
  • Three or more nodes
  • Standard_DS3_v2 nodes
  • RBAC enabled
  1. Enable AKS in your subscription, use the following command with the az cli: bash az provider register -n Microsoft.ContainerService You should also ensure that the Microsoft.Compute and Microsoft.Network providers are registered in your subscription. If you need to enable them: bash az provider register -n Microsoft.Compute az provider register -n Microsoft.Network
  2. Create the AKS cluster!
   az aks create --resource-group $RESOURCE_GROUP \
   --name $CLUSTER_NAME \
   --generate-ssh-keys \
   --kubernetes-version 1.11.5 \
   --enable-rbac \
   --node-vm-size Standard_DS3_v2
  1. Configure kubectl to use the new cluster.
   az aks get-credentials --resource-group $RESOURCE_GROUP --name $CLUSTER_NAME --admin
  1. Verify your cluster is up and running bash kubectl get nodes

Installing Istio

Note: Gloo is available as an alternative to Istio. Click here to install Knative with Gloo.

Knative depends on Istio. If your cloud platform offers a managed Istio installation, we recommend installing Istio that way, unless you need the ability to customize your installation.

If you prefer to install Istio manually, if your cloud provider doesn’t offer a managed Istio installation, or if you’re installing Knative locally using Minkube or similar, see the Installing Istio for Knative guide.

You must install Istio on your Kubernetes cluster before continuing with these instructions to install Knative.

Installing Knative

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

  1. If you are upgrading from Knative 0.3.x: Update your domain and static IP address to be associated with the LoadBalancer istio-ingressgateway instead of knative-ingressgateway. Then run the following to clean up leftover resources:
   kubectl delete svc knative-ingressgateway -n istio-system
   kubectl delete deploy knative-ingressgateway -n istio-system

If you have the Knative Eventing Sources component installed, you will also need to delete the following resource before upgrading:

   kubectl delete statefulset/controller-manager -n knative-sources

While the deletion of this resource during the upgrade process will not prevent modifications to Eventing Source resources, those changes will not be completed until the upgrade process finishes.

  1. To install Knative, first install the CRDs by running the kubectl apply command once with the --selector knative.dev/crd-install=true flag. This prevents race conditions during the install, which cause intermittent errors:
   kubectl apply --selector knative.dev/crd-install=true \
   --filename https://github.com/knative/serving/releases/download/v0.6.0/serving.yaml \
   --filename https://github.com/knative/build/releases/download/v0.6.0/build.yaml \
   --filename https://github.com/knative/eventing/releases/download/v0.6.0/release.yaml \
   --filename https://github.com/knative/eventing-sources/releases/download/v0.6.0/eventing-sources.yaml \
   --filename https://github.com/knative/serving/releases/download/v0.6.0/monitoring.yaml \
   --filename https://raw.githubusercontent.com/knative/serving/v0.6.0/third_party/config/build/clusterrole.yaml
  1. To complete the install of Knative and its dependencies, run the kubectl apply command again, this time without the --selector knative.dev/crd-install=true flag, to complete the install of Knative and its dependencies:
   kubectl apply --filename https://github.com/knative/serving/releases/download/v0.6.0/serving.yaml --selector networking.knative.dev/certificate-provider!=cert-manager \
   --filename https://github.com/knative/build/releases/download/v0.6.0/build.yaml \
   --filename https://github.com/knative/eventing/releases/download/v0.6.0/release.yaml \
   --filename https://github.com/knative/eventing-sources/releases/download/v0.6.0/eventing-sources.yaml \
   --filename https://github.com/knative/serving/releases/download/v0.6.0/monitoring.yaml \
   --filename https://raw.githubusercontent.com/knative/serving/v0.6.0/third_party/config/build/clusterrole.yaml

Notes: - By default, the Knative Serving component installation (serving.yaml) includes a controller for enabling automatic TLS certificate provisioning. If you do intend on immediately enabling auto certificates in Knative, you can remove the --selector networking.knative.dev/certificate-provider!=cert-manager statement to install the controller. Otherwise, you can choose to install the auto certificates feature and controller at a later time.

  • For the v0.4.0 release and newer, the clusterrole.yaml file is required to enable the Build and Serving components to interact with each other.
  1. Monitor the Knative components until all of the components show a STATUS of Running: bash 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.

Cleaning up

Running a cluster costs money, so you might want to delete the cluster when you’re done if you’re not using it. Deleting the cluster will also remove Knative, Istio, and any apps you’ve deployed.

To delete the cluster, enter the following command:

az aks delete --resource-group $RESOURCE_GROUP --name $CLUSTER_NAME --yes --no-wait