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Install on IBM Cloud Kubernetes Service (IKS)
This guide walks you through the installation of the latest version of Knative on an IBM Cloud Kubernetes Service (IKS) cluster.
You can find guides for other platforms here.
Before you begin
Knative requires a Kubernetes cluster v1.15 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
ibmcloudinstalled with the
ibmcloud csplugin, you can skip these steps.
Download and install the
ibmcloudcommand line tool: https://console.bluemix.net/docs/cli/index.html#overview
ibmcloud plugin install container-service -r Bluemix
Setting environment variables
To simplify the command lines for this walkthrough, you need to define a few environment variables.
export CLUSTER_NAME=knative export CLUSTER_REGION=us-south export CLUSTER_ZONE=dal13
CLUSTER_NAMEmust be lowercase and unique among any other Kubernetes clusters in this IBM Cloud region.
CLUSTER_REGIONcan 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_ZONEcan 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 zonesafter 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 1.15 or later
- 4 vCPU nodes with 16GB memory (
ibmcloudto 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 \ --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 $CLUSTER_ZONEand include the public/private VLAN in the
ibmcloud cs cluster-create --name=$CLUSTER_NAME \ --zone=$CLUSTER_ZONE \ --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”.
kubectlto the cluster:
ibmcloud cs cluster-config $CLUSTER_NAME
Follow the instructions on the screen to
KUBECONFIGvalue to point to the created cluster.
Make sure all nodes are up:
kubectl get nodes
Make sure all the nodes are in
Readystate. You are now ready to install Istio into your cluster.
With a Kuberntes cluster ready, you now have two choices on how to install Knative: via a one-click “add-on” or manually.
Installing Knative using an IKS managed add-on
The easiest way to install it is using the Managed Knative add-on facility. This one-click install process will install Knative, and Istio if not already installed, and provide automatic updates and lifecycle management of your Knative control plane.
You can get the add-on via the “Add-ons” tab of your Kubernetes cluster's console page, or via the command line:
ibmcloud ks cluster-addon-enable knative -y $CLUSTER_NAME
For more information about the add-on see here.
Manually installing Knative on IKS
However, if you'd like to install Knative manually, see the instructions below. Kind in mind that if you do not use the add-on mechanism then you will need to manually manage the upgrade of your Istio and Knative installs yourself going forward.
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.
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
The following commands install all available Knative components as well as the standard set of observability plugins. To customize your Knative installation, see Performing a Custom Knative Installation.
If you are upgrading from Knative 0.3.x: Update your domain and static IP address to be associated with the LoadBalancer
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.
To install Knative, first install the CRDs by running the
kubectl applycommand once with the
-l knative.dev/crd-install=trueflag. 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
To complete the install of Knative and its dependencies, run the
kubectl applycommand again, this time without the
--selectorflag, 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
Monitor the Knative components until all of the components show a
kubectl get pods --namespace knative-serving kubectl get pods --namespace knative-eventing kubectl get pods --namespace knative-monitoring
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.
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
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