Knative Example on microk8s

This is a small template on how knative functions can be easily deployed on k8s and automate the deployment process.

Installing knative on microk8s / k8s distribution

For Microk8s enable addons

microk8s enable helm3 istio dashboard metallb dns storage
#(Give avaliable IP range eg 192.168.1.30 - 192.168.1.40)
sudo snap alias microk8s.kubectl kubectl
sudo snap alias microk8s.helm3 helm

For other k8s distibutions

Follow the knative documentation on installing istio and other prerequisites.

Installing knative serving and eventing components

Install Serving Components

kubectl apply -f https://github.com/knative/serving/releases/download/v0.24.0/serving-crds.yaml
kubectl apply -f https://github.com/knative/serving/releases/download/v0.24.0/serving-core.yaml
kubectl apply -f https://github.com/knative/net-istio/releases/download/v0.24.0/net-istio.yaml
kubectl apply -f https://github.com/knative/serving/releases/download/v0.24.0/serving-default-domain.yaml

Install Eventing Components

kubectl apply -f https://github.com/knative/eventing/releases/download/v0.24.0/eventing-crds.yaml
kubectl apply -f https://github.com/knative/eventing/releases/download/v0.24.0/eventing-core.yaml
kubectl apply -f https://github.com/knative/eventing/releases/download/v0.24.0/in-memory-channel.yaml
kubectl apply -f https://github.com/knative/eventing/releases/download/v0.24.0/mt-channel-broker.yaml

Build and deploy functions on k8s

To Build the functions run below command. This will build the docker images , and copy them over to microk8s local.

make build_microk8s 

To deploy the functions run

make deploy 

To get access URL's run below command

kubectl get ksvc

Example outout

NAME                     URL                                                       LATESTCREATED                  LATESTREADY              READY     REASON
hello-private-function   http://hello-private-function.default.svc.cluster.local   hello-private-function-00001                            Unknown   RevisionMissing
hello-knative            http://hello-knative.default.192.168.1.40.sslip.io        hello-knative-00001            hello-knative-00001      True      
hello-world              http://hello-world.default.192.168.1.40.sslip.io          hello-world-00001              hello-world-00001        Unknown   Uninitialized
hello-kubernetes         http://hello-kubernetes.default.192.168.1.40.sslip.io     hello-kubernetes-00001         hello-kubernetes-00001   Unknown   IngressNotConfigured