1. install docker, kubectl, minikube, and helm
  2. monitor your riff cluster with watch and kubectl
  3. install riff and kafka using a helm chart
  4. create a sample function
  5. publish an event to trigger the sample function
  6. delete the sample function

NOTE: The Kubernetes community is promoting the use of RBAC for all clusters. Starting with with Minikube v0.26.0 the default for Minikube is to use the kubeadm bootstrapper which enables RBAC. The older localkube bootstrapper is now deprecated. The following instructions assume that your cluster is running with RBAC enabled. It is still possible to install riff without RBAC roles by adding a --set rbac.create=false option when installing the riff chart.

install docker

Installing Docker Community Edition is the easiest way get started with docker. Since minikube includes its own docker daemon, you actually only need the docker CLI to build function containers for riff. This means that if you want to, you can shut down the Docker (server) app, and turn off automatic startup of Docker on login.

install kubectl

Kubectl is the Kubernetes CLI. It is used to manage minikube as well as hosted Kubernetes clusters. If you already have the Google Cloud Platform SDK, use: gcloud components install kubectl.

install minikube

Minikube is a Kubernetes environment which runs in a single virtual machine. See the latest release for installation, and the readme for more detailed information.

start your minikube cluster

minikube start --memory=4096 --bootstrapper=kubeadm

Once minikube is running you can open a browser-based dashboard with minikube dashboard.

configure docker to build containers in minikube

This is only reqired once per terminal session. See here for more details.

eval $(minikube docker-env)

monitor your minikube

At this point it is useful to monitor your minikube using a utility like watch to refresh the output of kubectl get in a separate terminal window every one or two seconds.

brew install watch
watch -n 1 kubectl get pods,deployments --all-namespaces

install helm

Helm is used to package and install resources for Kubernetes. Helm packages are called charts. After installing the helm CLI, point helm to the riff-charts repo.

helm repo add projectriff
helm repo update

start the helm server (tiller) with RBAC

The Helm project describes the Best Practices for Securing Helm and Tiller in their documentation. This can be fairly involved and for less critical development clusters it is easier to configure the Helm tiller server to run with cluster-admin privileges using a service account in the kube-system namespace.

The following commands will install the Helm tiller server to run with cluster-admin privileges.

kubectl -n kube-system create serviceaccount tiller
kubectl create clusterrolebinding tiller --clusterrole cluster-admin --serviceaccount=kube-system:tiller
helm init --service-account=tiller

Watch kubectl for tiller to start running.

install riff and kafka

Install riff and kafka together on the same riff-system namespace, with the release name projectriff. For minikube you should use a NodePort for the HTTP gateway.

helm install projectriff/riff \
  --name projectriff \
  --namespace riff-system \
  --set kafka.create=true \
  --set httpGateway.service.type=NodePort

Watch the riff-system namespace with kubectl. You may need to wait a minute for the container images to be pulled, and for zookeeper to start. It is normal for the kafka broker and the other riff components to fail and re-start while waiting.

watch -n 1 kubectl get po,deploy --namespace riff-system
NAME                                                       READY     STATUS    RESTARTS   AGE
po/projectriff-riff-function-controller-7d959dbf4f-p7pnz   1/1       Running   0          5m
po/projectriff-riff-http-gateway-666bb96d6c-hzmvn          1/1       Running   0          5m
po/projectriff-riff-topic-controller-dcf76d565-mw6th       1/1       Running   0          5m
po/projectriff-kafka-68b986865b-6tsbk                      1/1       Running   3          11m
po/projectriff-zookeeper-85fc6df85c-v6kxx                  1/1       Running   0          11m

NAME                                          DESIRED   CURRENT   UP-TO-DATE   AVAILABLE   AGE
deploy/projectriff-riff-function-controller   1         1         1            1           5m
deploy/projectriff-riff-http-gateway          1         1         1            1           5m
deploy/projectriff-riff-topic-controller      1         1         1            1           5m
deploy/projectriff-kafka                      1         1         1            1           11m
deploy/projectriff-zookeeper                  1         1         1            1           11m

install the current riff CLI tool

The riff CLI is available to download from our GitHub releases page.

install invokers

Starting in v0.0.6, riff invoker resources are installed separately from riff.

riff invokers apply -f
riff invokers apply -f
riff invokers apply -f
riff invokers apply -f
riff invokers apply -f

new function using node.js

The steps below will create a JavaScript function from scratch. The same files are also available in the square sample on GitHub.

write the function source

Create square.js in an empty directory.

module.exports = (x) => x ** 2

create the function deployment

Run the following command from the same directory where the above function file is created:

riff create node --name square --input numbers --filepath .

This command will initialize the function, creating a Dockerfile and YAML files square-function.yaml and square-topics.yaml defining the Kubernetes resources for the function and topics respectively. It will also build the docker image and apply the Kubernetes function and topics resources to the cluster.

watch for functions and topics in the default namespace

watch -n 1 kubectl get functions,topics,pods,deployments

trigger the function

riff publish --input numbers --data 10 --reply

If 10 is the input to the square function, the response should be 100. You can also abbreviate parameters as follows:

riff publish -i numbers -d 10 -r

delete the function and topic

riff delete --name square --all