Docker for Mac

Last week I deployed Fn Project on Kubernetes as a quick smoke test. Fn is the new serverless platform that was open sourced at Java One 2017. Running it on Kubernetes is easier than ever because Docker directly supports Kubernetes now, as announced at the last DockerCon. In the end it just worked without any issues.

To reproduce the steps, first of all make sure the latest version of Docker with Kubernetes support is installed properly and Kubernetes is enabled (in my case this is 17.12.0-ce-mac45 from the edge channel) .

Prerequisites and Checks

List the images of running Docker containers. This should show you the containers required for K8s if you enabled it in the Docker console under preferences:

$ docker container ls --format "table{\t{{.Image }}}"

Next, check if there are existing contexts. For example I have minikube and and GKE configured as well. Make sure the * (astericks) is set to docker-for-desktop:

$ kubectl config get-contexts
CURRENT   NAME                                         CLUSTER                                      AUTHINFO                                     NAMESPACE
*         docker-for-desktop                           docker-for-desktop-cluster                   docker-for-desktop                           
          gke_fmproject-194414_us-west2-a_fm-cluster   gke_fmproject-194414_us-west2-a_fm-cluster   gke_fmproject-194414_us-west2-a_fm-cluster   
          minikube                                     minikube                                     minikube                                  

If it is not set correctly, you can point kubectl to the correct Kubernetes cluster with the following command:

$ kubectl config use-context docker-for-desktop

Also you can see the running nodes:

$ kubectl get nodes
NAME                 STATUS    ROLES     AGE       VERSION
docker-for-desktop   Ready     master    9d        v1.8.2

Check out the cluster, it just consists of a single node:

$ kubectl cluster-info
Kubernetes master is running at https://localhost:6443
KubeDNS is running at https://localhost:6443/api/v1/namespaces/kube-system/services/kube-dns/proxy

Setup

To get better visibility into K8s I recommend to install the Kubernetes Dashboard:

$ kubectl create -f 
https://raw.githubusercontent.com/kubernetes/dashboard/master/src/deploy/recommended/kubernetes-dashboard.yaml

The dashboard is running in the kube-system namespace and you can check this with the following command:

$ kubectl get pods --namespace=kube-system

Enable Port Forwarding for the dashboard

Enable port forwarding to port 8443 with the following command and make sure to use the correct pod name:

$ kubectl port-forward kubernetes-dashboard-7798c48646-ctrtl 8443:8443 --namespace=kube-system

With a web browser connect to https://localhost:8443. When asked, allow access for the untrusted site and click on “Skip”.

Alternative to Port Forward: Proxy

Alternatively you could access it via the proxy service:

$ kubectl proxy

Then use the following URL with the browser

http://localhost:8001/api/v1/namespaces/kube-system/services/https:kubernetes-dashboard:/proxy/

Microservice smoke test

The following steps are not necessary to run Fn project. However, I first deployed a small microservice to see if Kubernetes was running fine for me on my Mac. Feel free to skip that entirely. To copy what I did, you could follow the steps for load balancing a microservice with K8s

Fn on Kubernetes

Helm

Make sure your Kubernetes cluster is up and running and working correctly. We will use the K8s package manager Helm to install Fn.

Install Helm

Follow the instructions to [install Helm(https://docs.helm.sh/using_helm/#installing-helm) on your system, e.g. on a Mac it can be done with with brew. Helm will talk to Tiller, a deployment on the K8s cluster.

Init Helm and provision Tiller

$ helm init
$HELM_HOME has been configured at /Users/frank/.helm.

Tiller (the Helm server-side component) has been installed into your Kubernetes Cluster.
Happy Helming!

Install Fn

You can simply follow the instructions about installing Fn on Kubernetes. I put the steps here for completeness. First, let’s clone the fn-helm repo from github:

$ git clone https://github.com/fnproject/fn-helm.git && cd fn-helm

Install chart dependencies (from requirements.yaml):

$ helm dep build fn

Then install the chart. I chose the release name fm-release:

$ helm install --name fm-release fn

Then make sure to set the FN_API_URL as described in the output of the command above.

This should be it! You should see the following deployment from the K8s console.

Try to run a function. For more details checke the Fn Helm instruction on github.

Summary

Installing Fn on K8s with Helm should work on any Kubernetes cluster. Give it a try yourself, code some functions and run them on Fn / Kubernetes. Feel free to check out my Serverless slides.