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Knative-with-AKS.md

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Knative 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 v1.10 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: 
    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 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: 
    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 1.10 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: 
    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

  1. Create the AKS cluster!

    az aks create --resource-group $RESOURCE_GROUP \
--name $CLUSTER_NAME \
--generate-ssh-keys \
--kubernetes-version 1.10.5 \
--enable-rbac \
--node-vm-size Standard_DS3_v2

  2. Configure kubectl to use the new cluster.

    az aks get-credentials --resource-group $RESOURCE_GROUP --name $CLUSTER_NAME --admin

  3. Verify your cluster is up and running

    kubectl get nodes

Installing Istio

Knative depends on Istio.

  1. Install Istio:

    kubectl apply -f https://raw.githubusercontent.com/knative/serving/v0.1.1/third_party/istio-0.8.0/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 -n 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 -f https://github.com/knative/serving/releases/download/v0.1.1/release.yaml
  2. Monitor the Knative components until all of the components show a STATUS of Running: 
    kubectl get pods -n knative-serving
kubectl get pods -n knative-build

Installing Knative Build only

  1. Run the kubectl apply command to install Knative Build and its dependencies: 
    kubectl apply -f https://raw.githubusercontent.com/knative/serving/v0.1.1/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 -n 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:

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