Install OpenFaas on k3d Kubernetes

In this post we will deploy iopenfaas on kubernetes (k3d)

Kubernetes on k3d

k3d is a helper tool that provisions a kubernetes distribution, called k3s on docker. To deploy a kubernetes cluster on k3d, you can follow this blog post

Deploy a 3 Node Kubernetes Cluster

Using k3d, let's deploy a kubernetes cluster:

$ k3d create --name="demo" --workers="2" --publish="80:80"

Export the kubeconfig:

$ export KUBECONFIG="$(k3d get-kubeconfig --name='demo')"

Verify that you are able to communicate with your kubernetes cluster:

$ kubectl get nodes

Deploy OpenFaas

First we need to get k3sup :

$ curl -sLfS https://get.k3sup.dev | sudo sh

Once k3sup is installed, deploy openfaas to your cluster:

$ k3sup app install openfaas

Give it a minute or so and check if everything is running:

$ kubectl get pods -n openfaas
NAMESPACE     NAME                                 READY   STATUS      RESTARTS   AGE
openfaas      alertmanager-546f66b6c6-qtb69        1/1     Running     0          5m
openfaas      basic-auth-plugin-79b9878b7b-7vlln   1/1     Running     0          4m59s
openfaas      faas-idler-db8cd9c7d-8xfpp           1/1     Running     2          4m57s
openfaas      gateway-7dcc6d694d-dmvqn             2/2     Running     0          4m56s
openfaas      nats-d6d574749-rt9vw                 1/1     Running     0          4m56s
openfaas      prometheus-d99669d9b-mfxc8           1/1     Running     0          4m53s
openfaas      queue-worker-75f44b56b9-mhhbv        1/1     Running     0          4m52s

Install the openfaas-cli:

$ curl -SLsf https://cli.openfaas.com | sudo sh

In a screen session, forward port 8080 to the gateway service:

$ screen -S portfwd-process -m -d sh -c "kubectl port-forward -n openfaas svc/gateway 8080:8080"

Expose the gateway password as an environment variable:

$ PASSWORD=$(kubectl get secret -n openfaas basic-auth -o jsonpath="{.data.basic-auth-password}" | base64 --decode; echo)

Then login to the gateway:

$ echo -n $PASSWORD | faas-cli login --username admin --password-stdin

Deploy a OpenFaas Function

To list all the functions:

$ faas-cli store list

To deploy the figlet function:

$ faas-cli store deploy figlet

Deployed. 202 Accepted.
URL: http://127.0.0.1:8080/function/figlet

List your deployed functions:

$ faas-cli list
Function                      	Invocations    	Replicas
figlet                        	0              	1

Invoke your function:

$ curl http://127.0.0.1:8080/function/figlet -d 'hello, world'
 _          _ _                             _     _
| |__   ___| | | ___    __      _____  _ __| | __| |
| '_ \ / _ \ | |/ _ \   \ \ /\ / / _ \| '__| |/ _` |
| | | |  __/ | | (_) |   \ V  V / (_) | |  | | (_| |
|_| |_|\___|_|_|\___( )   \_/\_/ \___/|_|  |_|\__,_|
                    |/

Delete your Cluster

When you are done, delete your kubernetes cluster:

$ k3d delete --name demo

Thank You

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