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Installing and Configuring Knative

Installing and Configuring Knative

Go through the prerequisites and installation details for configuring Knative.

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Knative and Kubernetes

We’ve already stated that Knative is a platform running on top of Kubernetes, so it should be no surprise that it’s the first requirement. However, it can’t be any Kubernetes. To be more precise, it can be any Kubernetes, as long as it’s version 1.16 and above.

To make things simpler, we’ve created Gists for creating Kubernetes clusters in different flavors. They cover the requirements and the commands for Google Kubernetes Engine (GKE), AWS Elastic Kubernetes Service (EKS), and Azure Kubernetes Service. That doesn’t mean you have to use any of those Gists, nor that other Kubernetes flavors aren’t supported. All you really need is a Kubernetes cluster version 1.16+ and with sufficient capacity. Just bear in mind that we tested all the commands in clusters available in the Gists. So, if you choose to roll out your own, you might need to change a thing or two.

Installing Knative

The initial installation of Knative is straightforward. All we have to do is apply YAML definitions that will create Custom Resource Definitions (CRDs) and deploy the core components. Later on, we’ll see that the situation gets a bit more complicated with service mesh. For now, we’ll focus on deploying the CRDs and the core components.

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kubectl apply \
    --filename https://github.com/knative/serving/releases/download/v0.19.0/serving-crds.yaml
kubectl apply \
    --filename https://github.com/knative/serving/releases/download/v0.19.0/serving-core.yaml

Knative was deployed inside the knative-serving namespace, so let’s take a quick look at the Pods running there.

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kubectl --namespace knative-serving \
    get pods

The output is as follows.

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NAME                                    READY   STATUS    RESTARTS   AGE
activator-8cb55b8c6-crtgn               1/1     Running   0          24m
autoscaler-cfd889f9b-xj2jj              1/1     Running   0          24m
controller-64bc7bd6df-csvt9             1/1     Running   0          24m
domain-mapping-7877bf8f89-kw6d8         1/1     Running   0          24m
domainmapping-webhook-c4cc9dc7b-rzx68   1/1     Running   0          24m
net-istio-controller-6bbdf5689f-lxpgb   1/1     Running   0          22m
net-istio-webhook-5fff987dc5-q9wdr      1/1     Running   0          22m
webhook-7b955f5956-45dpf                1/1     Running   0          24m

We’ll explore some of those Pods later on. For now, the important thing is to confirm that they’re all running. If one of them is still pending, please ...