skaffold

Developing multiple functions on the same host using Minikube and Skaffold

Introduction

This example shows you how to develop multiple Cloud Functions to a single host using Minikube and Skaffold.

The example will focus on:

• taking two separate Cloud Functions (defined in the same file)
• building them each individually with Cloud Buildpacks and the Functions Framework
• deploying them to a local Kubernetes cluster with minikube and skaffold
• including live reloading!

Install minikube

Note: If on Cloud Shell, minikube is pre-installed.

Install minikube via the instructions for your platform at https://minikube.sigs.k8s.io/docs/start/

Confirm that minikube is installed:

minikube version

You should see output similar to:

minikube version: v1.15.1
commit: 23f40a012abb52eff365ff99a709501a61ac5876

Start minikube

This starts minikube using the default profile:

minikube start

This may take a few minutes.

Note: If on Cloud Shell, you may be asked to enable Cloud Shell to make API calls

You should see output similar to:

😄  minikube v1.15.1 on Debian 10.6
    ▪ MINIKUBE_FORCE_SYSTEMD=true
    ▪ MINIKUBE_HOME=/google/minikube
    ▪ MINIKUBE_WANTUPDATENOTIFICATION=false
✨  Automatically selected the docker driver
👍  Starting control plane node minikube in cluster minikube
🚜  Pulling base image ...
💾  Downloading Kubernetes v1.19.4 preload ...
🔥  Creating docker container (CPUs=2, Memory=4000MB) ...
🐳  Preparing Kubernetes v1.19.4 on Docker 19.03.13 ...
🔎  Verifying Kubernetes components...
🌟  Enabled addons: storage-provisioner, default-storageclass
🏄  Done! kubectl is now configured to use "minikube" cluster and "default" namespace by default

Install the ingress addon for minikube

This allows minikube to handle external traffic:

minikube addons enable ingress

You should see output similar to:

🔎  Verifying ingress addon...
🌟  The 'ingress' addon is enabled

Install skaffold

Note: If on Cloud Shell, skaffold is pre-installed.

Install skaffold via the instructions for your platform at https://skaffold.dev/docs/install/

Confirm that skaffold is installed:

skaffold version

You should see output similar to:

v1.16.0

Start skaffold

Start skaffold with:

skaffold dev

You should see output similar to:

Starting deploy...
Waiting for deployments to stabilize...
 - deployment/hello is ready. [1/2 deployment(s) still pending]
 - deployment/goodbye is ready.
Deployments stabilized in 1.154162006s
Watching for changes...

This command will continue running indefinitely, watching for changes and redeploying as necessary.

Call your Cloud Functions

Leaving the previous command running, in a new terminal, call your functions. To call the hello function:

curl `minikube ip`/hello

You should see output similar to:

Hello, World!

To call the goodbye function:

curl `minikube ip`/goodbye

You should see output similar to:

Goodbye, World!