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OpenFaaS ® - Serverless Functions Made Simple

OpenFaaS Logo

OpenFaaS® makes it easy for developers to deploy event-driven functions and microservices to Kubernetes without repetitive, boiler-plate coding. Package your code or an existing binary in an OCI-compatible image to get a highly scalable endpoint with auto-scaling and metrics.

Highlights

Ease of use through UI portal and one-click install
Write services and functions in any language with Template Store or a Dockerfile
Build and ship your code in an OCI-compatible/Docker image
Portable: runs on existing hardware or public/private cloud by leveraging Kubernetes
CLI available with YAML format for templating and defining functions
Auto-scales as demand increases including to zero
Commercially supported Pro distribution by the team behind OpenFaaS

Want to dig deeper into OpenFaaS?

Trigger endpoints with either HTTP or events sources such as Apache Kafka and AWS SQS
Offload tasks to the built-in queuing and background processing
Quick-start your Kubernetes journey with GitOps from OpenFaaS Cloud
Go secure or go home with 5 must-know security tips
Learn everything you need to know to go to production
Integrate with Istio or Linkerd with Featured Tutorials
Deploy to Kubernetes or OpenShift

OpenFaaS Tiers and Pricing

This repository is part of OpenFaaS Community Edition (CE), which is licensed for non-commercial use by individuals, and a time-limited trial for commercial Proof Of Concepts (PoC). Internal use within a company or business requires a license.

OpenFaaS CE:

has usage restrictions, which you can learn about in the OpenFaaS CE EULA
has basic or primitive features and capabilities compared to the commercial versions
is not licensed for commercial use of any kind beyond an initial trial period

OpenFaaS Standard and OpenFaaS for Enterprises are full and distinct commercial products.

They are maintained and developed independently, by a full-time team, with commercial support, and active maintenance for CVEs, and updates in the Kubernetes and Cloud Native ecosystem.

Learn more about the tiers at https://www.openfaas.com/pricing/

Overview of OpenFaaS (Serverless Functions Made Simple)

Conceptual architecture

Conceptual architecture and stack, more detail available in the docs

Code samples

You can scaffold a new function using the faas-cli new command passing in the name of the function and the language template you want to use i.e. faas-cli new --lang node20 stripe-webhooks.

Official templates exist for many popular languages and are easily extensible with Dockerfiles.

Learn about OpenFaaS templates in the docs

Node.js (node20) example:

"use strict"

module.exports = async (event, context) => {
    return context
        .status(200)
        .headers({"Content-Type": "text/html"})
        .succeed(`
        <h1>
            👋 Hello World 🌍
        </h1>`);
}

handler.js

Python 3 example (python3-http):

def handle(event, context):
    return {
        "statusCode": 200,
        "body": "Hello from OpenFaaS!"
    }

handler.py

Golang example (golang-middleware)

package function

import (
 	"fmt"
 	"io"
 	"net/http"
)

func Handle(w http.ResponseWriter, r *http.Request) {
    var input []byte
    
   	if r.Body != nil {
    		defer r.Body.Close()
    		body, _ := io.ReadAll(r.Body)
    		input = body
   	}
    
   	w.WriteHeader(http.StatusOK)
   	w.Write([]byte(fmt.Sprintf("Body: %s", string(input))))
}

Get started with OpenFaaS

Official training resources

View our official training materials

Official eBook and video workshop

The founder of OpenFaaS wrote Serverless For Everyone Else to help developers understand the use-case for functions through practical hands-on exercises using JavaScript and Node.js. No programming experience is required to try the exercises.

The examples use the faasd project, which is an easy to use and lightweight way to start learning about OpenFaaS and functions.

Check out Serverless For Everyone Else on Gumroad

OpenFaaS and Golang

Everyday Go is a practical, hands-on guide to writing CLIs, web pages, and microservices in Go. It also features a chapter dedicated to development and testing of functions using OpenFaaS and Go.

Everyday Golang

Community blog and documentation

Read the documentation: docs.openfaas.com
Read latest news and tutorials on the Official Blog

Quickstart

OpenFaaS Community Edition UI

Here is a screenshot of the OpenFaaS Community Edition UI which was designed for ease of use. The inception function is being run which is available on the in the store.

Deploy OpenFaaS to Kubernetes, OpenShift, or faasd now with a deployment guide

OpenFaaS Standard and OpenFaaS for Enterprises have their own, brand new dashboard with multi-tenancy support, learn more about the OpenFaaS Dashboard.

Video presentations

Community events and blog posts

Have you written a blog about OpenFaaS? Do you have a speaking event? Send a Pull Request to the community page below.

Read blogs/articles and find events about OpenFaaS

Contributing

OpenFaaS Community Edition is written in Golang. All third-party contributions to the source code are made under the MIT license, additional restrictions apply to OpenFaaS CE as a whole, where contributions from OpenFaaS Ltd are licensed under the OpenFaaS CE EULA. Various types of contributions are welcomed whether that means providing feedback, testing existing and new feature or hacking on the source code.

How do I become a contributor?

Please see the guide on community & contributing

Dashboards

Example of a Grafana dashboard linked to OpenFaaS showing auto-scaling live in action: here

OpenFaaS Pro auto-scaling dashboard with Grafana

OpenFaaS Pro auto-scaling dashboard with Grafana

An alternative community dashboard is available here

Press / Branding / Website Sponsorship

Website Sponsorship 🌎

If you'd like to gain visibility by displaying your logon on the openfaas.com homepage, feel free to reach out via email or browse the tiers via GitHub Sponsors.
Press / Analysts

Looking at these repositories for commit counts and activity? All public repositories are part of OpenFaaS CE, a limited version of OpenFaaS aimed at giving people a low-barrier trial experience without having to sign up with a credit card. OpenFaaS CE is maintained on a best effort basis, but is not "OpenFaaS" itself. All OpenFaaS product development is done in private repositories, and cannot be tracked by third parties or by simply browsing GitHub.

How are GitHub Stars and Forks counted? OpenFaaS CE is not a mono-repo, you cannot simply look at one repository and say "ah that's the count" - statistics are gathered from the whole GitHub organisation.

Governance

OpenFaaS ® is an independent open-source project created by Alex Ellis, which is being built and shaped by a growing community of contributors.

OpenFaaS is hosted by OpenFaaS Ltd (registration: 11076587), a company which also offers commercial services, homepage sponsorships, and support. OpenFaaS ® is a registered trademark in England and Wales.

Users

View a selection of end-user companies who have given permission to have their logo listed at openfaas.com.

openfaas / faas

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