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 v1.15 or newer, as well as a compatible kubectl. 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:
    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:
    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 the client is within a minor version of the master, then 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:
    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
    
  2. Create a resource group with the az cli using the following command if you are using a new resource group.

    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 1.15 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 1.15.5 \
    --enable-rbac \
    --node-vm-size Standard_DS3_v2
    
  3. Configure kubectl to use the new cluster.

    az aks get-credentials --resource-group $RESOURCE_GROUP --name $CLUSTER_NAME --admin
    
  4. Verify your cluster is up and running

    kubectl get nodes
    

Installing Istio

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.

Note: Ambassador, Contour, and Gloo are available as an alternative to Istio. Click here to install Knative with Ambassador. Click here to install Knative with Contour. Click here to install Knative with Gloo.

Installing cluster-local-gateway for serving cluster-internal traffic

If you installed Istio, you can install a cluster-local-gateway within your Knative cluster so that you can serve cluster-internal traffic. If you want to configure your revisions to use routes that are visible only within your cluster, install and use the cluster-local-gateway.

Installing Knative

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

  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/v0.12.0/serving.yaml \
    --filename https://github.com/knative/eventing/releases/download/v0.12.0/eventing.yaml \
    --filename https://github.com/knative/serving/releases/download/v0.12.0/monitoring.yaml
    
  2. 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/v0.12.0/serving.yaml \
    --filename https://github.com/knative/eventing/releases/download/v0.12.0/eventing.yaml \
    --filename https://github.com/knative/serving/releases/download/v0.12.0/monitoring.yaml
    
  3. 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-eventing
    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 the Getting Started with Knative App Deployment guide.

Get started with Knative Eventing by walking through one of the Eventing Samples.

Install Cert-Manager if you want to use the automatic TLS cert provisioning feature.

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