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Knative Install on IBM Cloud Kubernetes Service (IKS)

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. This guide walks you through creating a cluster with the correct specifications for Knative on IBM Cloud Kubernetes Service.

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

Installing the IBM Cloud developer tools

If you already have ibmcloud installed with the ibmcloud cs plugin, you can skip these steps.

Download and install the ibmcloud command line tool: https://console.bluemix.net/docs/cli/index.html#overview

Install the cs (container-service) plugin:

ibmcloud plugin install container-service -r Bluemix

Authorize ibmcloud:
```
ibmcloud login
```

Setting environment variables

To simplify the command lines for this walkthrough, you need to define a few environment variables.

Set CLUSTER_NAME, CLUSTER_REGION, and CLUSTER_ZONE variables:
```
export CLUSTER_NAME=knative
export CLUSTER_REGION=us-south
export CLUSTER_ZONE=dal13
```
- CLUSTER_NAME must be lowercase and unique among any other Kubernetes clusters in this IBM Cloud region.
- CLUSTER_REGION can be any region where IKS is available. You can get a list of all available regions via the IBM Cloud documentation or via ibmcloud cs regions.
- CLUSTER_ZONE can be any zone that is available in the specified region above. You can get a list of all avaible locations from the IBM Cloud documentation or by using ibmcloud cs zones after you set the region by using ibmcloud cs region-set $CLUSTER_REGION.

Creating a Kubernetes cluster

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
4 vCPU nodes with 16GB memory (b2c.4x16)

Set ibmcloud to the appropriate region:
```
ibmcloud cs region-set $CLUSTER_REGION
```

Create a Kubernetes cluster on IKS with the required specifications:

ibmcloud cs cluster-create --name=$CLUSTER_NAME \
  --zone=$CLUSTER_ZONE \
  --kube-version=1.10.3 \
  --machine-type=b2c.4x16 \
  --workers=3

If you're starting in a fresh account with no public and private VLANs, they are created automatically for you. If you already have VLANs configured in your account, get them via ibmcloud cs vlans --zone $CLUSTER_ZONE and include the public/private VLAN in the cluster-create command:

ibmcloud cs cluster-create --name=$CLUSTER_NAME \
  --zone=$CLUSTER_ZONE \
  --kube-version=1.10.3 \
  --machine-type=b2c.4x16 \
  --workers=3 \
  --private-vlan $PRIVATE_VLAN_ID \
  --public-vlan $PUBLIC_VLAN_ID

Wait until your Kubernetes cluster is deployed:
```
ibmcloud cs clusters | grep $CLUSTER_NAME
```
It can take a while for your cluster to be deployed. Repeat the above command until the state of your cluster is "normal".
Point kubectl to the cluster:
```
ibmcloud cs cluster-config $CLUSTER_NAME
```
Follow the instructions on the screen to EXPORT the correct KUBECONFIG value to point to the created cluster.
Make sure all nodes are up:
```
kubectl get nodes
```
Make sure all the nodes are in Ready state. You are now ready to install Istio into your cluster.

Installing Istio

Knative depends on Istio.

Install Istio:

kubectl apply --filename https://raw.githubusercontent.com/knative/serving/v0.1.1/third_party/istio-0.8.0/istio.yaml

Label the default namespace with istio-injection=enabled:

kubectl label namespace default istio-injection=enabled

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

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

kubectl apply --filename https://github.com/knative/serving/releases/download/v0.1.1/release.yaml

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

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

kubectl apply --filename https://raw.githubusercontent.com/knative/serving/v0.1.1/third_party/config/build/release.yaml

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:

Follow the step-by-step Getting Started with Knative App Deployment guide.
View the available sample apps and deploy one of your choosing.

Cleaning up

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

To delete the cluster, enter the following command:

ibmcloud cs cluster-rm $CLUSTER_NAME

Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License.

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