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The container native, cloud agnostic serverless platform.

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Fn Project

Quickstart  |  Tutorials  |  Docs  |  API  |  Operating  |  Flow  |  UI

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Fn is an event-driven, open source, Functions-as-a-Service (FaaS) compute platform that you can run anywhere. Some of its key features:

  • Open Source
  • Native Docker: use any Docker container as your Function
  • Supports all languages
  • Run anywhere
    • Public, private and hybrid cloud
    • Import Lambda functions and run them anywhere
  • Easy to use for developers
  • Easy to manage for operators
  • Written in Go
  • Simple yet powerful extensibility

The fastest way to experience Fn is to follow the quickstart below, or you can jump right to our full documentation, API Docs, or hit us up in our Slack Community or Community Page!



  • Docker 17.10.0-ce or later installed and running
  • Docker Hub account (or other Docker-compliant registry) (Not required for local development)
  • Logged into Registry: ie
    docker login
    (Not required for local development)

Install CLI tool

The command line tool isn't required, but it makes things a lot easier. There are a few options to install it:

Option 1. Homebrew - macOS

If you're on a Mac and use Homebrew:

brew update && brew install fn

Option 2. Shell script - Linux and macOS

This one works on Linux and macOS (partially on Windows).

If you are running behind a proxy first set your httpproxy and httpsproxy environment vars:

curl -LSs | sh

This will download a shell script and execute it. If the script asks for a password, that is because it invokes sudo.

Option 3. Install the Windows CLI

Install and run the Fn Client for Windows.

Option 4. Download the bin - Linux, macOS and Windows

Head over to our releases and download it.

Run Fn Server

First, start up an Fn server locally:

fn start

This will start Fn in single server mode, using an embedded database and message queue. You can find all the configuration options here. If you are on Windows, check here. If you are on a Linux system where the SELinux security policy is set to "Enforcing", such as Oracle Linux 7, check here.

Your First Function

Functions are small but powerful blocks of code that generally do one simple thing. Forget about monoliths when using functions, just focus on the task that you want the function to perform. Our CLI tool will help you get started quickly.

Let's create your function. You can use any runtime (ie go, node, java, python, etc.)

will be the name of your function as well as create a directory called
. You can name your function anything.
fn init --runtime go hello
cd hello

We need to create an "app" which acts as a top-level collection of functions and other elements:

fn create app myapp

Deploy your function:

fn deploy --app myapp --local


flag will skip the push to remote container registry making local development faster

Now let's actually run your function using the

fn invoke myapp hello

That's it! You just deployed and ran your first function! Try updating the function code in

(or .js, .java, etc.) then deploy it again to see the change.

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