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Published: Oct 9, 2019 License: MIT Imports: 7 Imported by: 0



Poor man's function as a service.
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fx is a tool to help you do Function as a Service on your own server. fx can make your stateless function a service in seconds. The most exciting thing is that you can write your functions with most programming languages.

Feel free hacking fx to support the languages not listed. Welcome to tweet me @_metrue on Twitter, @metrue on Weibo.

Language Status Contributor Example
Go Supported fx /examples/Golang
Rust Supported @FrontMage /examples/Rust
Node Supported fx /examples/JavaScript
Python Supported fx /examples/Python
Ruby Supported fx /examples/Ruby
Java Supported fx /examples/Java
PHP Supported @chlins /examples/PHP
Julia Supported @matbesancon /examples/Julia
D Supported @andre2007 /examples/D
R Working on need your help


  • MacOS
brew tap metrue/homebrew-fx
brew install metrue/fx/fx
  • Linux/Unix

via cURL

curl -o- https://raw.githubusercontent.com/metrue/fx/master/scripts/install.sh | bash

or Wget

wget -qO- https://raw.githubusercontent.com/metrue/fx/master/scripts/install.sh | bash

fx will be installed into /usr/local/bin, sometimes you may need source ~/.zshrc or source ~/.bashrc to make fx available in $PAHT.

  • Window

You can go the release page to download fx manually;


Make sure Docker installed and running on your server first. then type fx -h on your terminal to check out basic help.

   fx - makes function as a service

   fx [global options] command [command options] [arguments...]


   infra     manage infrastructure of fx
   image     manage image of service
   doctor    health check for fx
   up        deploy a function or a group of functions
   down      destroy a service
   list, ls  list deployed services
   call      run a function instantly
   help, h   Shows a list of commands or help for one command

   --help, -h     show help
   --version, -v  print the version
  1. List your current machines and activate you machine
$ fx infra ls     # list machines

	"localhost": {
		"Host": "localhost",
		"User": "",
		"Password": "",
		"Enabled": true,
		"Provisioned": false

$ fx infra activate localhost    # activate 'localhost'

2019/08/10 13:21:20  info Provision:pull python Docker base iamge: ✓
2019/08/10 13:21:21  info Provision:pull d Docker base image: ✓
2019/08/10 13:21:23  info Provision:pull java Docker base image: ✓
2019/08/10 13:21:28  info Provision:pull julia Docker base image: ✓
2019/08/10 13:21:31  info Provision:pull node Docker base image: ✓
2019/08/10 13:22:09  info Provision:pull go Docker base image: ✓
2019/08/10 13:22:09  info provision machine localhost: ✓
2019/08/10 13:22:09  info enble machine localhost: ✓

It may take seconds since fx needs to download some basic resources

Note you can add a remote host as fx machine also,

$ fx infra add --name my_aws_vm --host --user root --password yourpassword

$ fx infra list
	"my_aws_vm": {
		"Host": "",
		"User": "root",
		"Password": "yourpassword",
		"Enabled": false,
		"Provisioned": false
	"localhost": {
		"Host": "localhost",
		"User": "",
		"Password": "",
		"Enabled": true,
		"Provisioned": true

$ fx infra activate my_aws_vm

then your function will be deployed onto remote host also.

  1. Write a function

You can check out examples for reference. Let's write a function as an example, it calculates the sum of two numbers then returns:

module.exports = (ctx) => {
    ctx.body = 'hello world'

Then save it to a file func.js.

  1. Deploy your function as a service

Give your service a port with --port, and name with --name, heath checking with --healthcheck if you want.

$ fx up -name fx_service_name -p 10001 --healthcheck func.js

2019/08/10 13:26:37  info Pack Service: ✓
2019/08/10 13:26:39  info Build Service: ✓
2019/08/10 13:26:39  info Run Service: ✓
2019/08/10 13:26:39  info Service (fx_service_name) is running on:
2019/08/10 13:26:39  info up function fx_service_name(func.js) to machine localhost: ✓

if you want see what the source code of your service looks like, you can export it into a dirctory,

$ fx image export -o <path of dir> func.js
2019/09/25 19:31:19  info exported to <path of dir>: ✓
  1. Test your service

then you can test your service:

$ curl -v

GET / HTTP/1.1
Accept: */*
Accept-Encoding: gzip, deflate
Connection: keep-alive
User-Agent: HTTPie/1.0.2

HTTP/1.1 200 OK
Connection: keep-alive
Content-Length: 11
Content-Type: text/plain; charset=utf-8
Date: Sat, 10 Aug 2019 05:28:03 GMT

hello world




fx supports deploy function to be a service onto Kubernetes cluster infrasture, and we encourage you to do that other than on bare Docker environment, there are lots of advantage to run your function on Kubernetes like self-healing, load balancing, easy horizontal scaling, etc. It's pretty simple to deploy your function onto Kubernetes with fx, you just set KUBECONFIG in your enviroment.

KUBECONFIG=<Your KUBECONFIG> fx deploy -n fx-service-abc_js -p 12349 examples/functions/JavaScript/func.js   # function will be deploy to your Kubernetes cluster and expose a IP address of your loadbalencer


$ fx deploy -n fx-service-abc_js -p 12349 examples/functions/JavaScript/func.js   # function will be deploy to your Kubernetes cluster and expose a IP address of your loadbalencer
  • Local Kubernetes Cluster

Docker for Mac and Docker for Windows already support Kubernetes with single node cluster, we can use it directly, and the default KUBECONFIG is ~/.kube/config.

$ export KUBECONFIG=~/.kube/config  # then fx will take the config to deloy function

if you have multiple Kubernetes clusters configured, you have to set context correctly. FYI configure-access-multiple-clusters

  • Azure Kubernetes Service (AKS)

You should create a Kubernetes cluster if you don't have one on AKS, detail document can found here.

$ az group create --name <myResourceGroup> --location eastus
$ az aks create --resource-group <myResourceGroup> --name myAKSCluster --node-count <count>
$ az aks get-credentials --resource-group <myResourceGroup> --name <myAKSCluster>

Then you can verify it with kubectl,

$ kubectl get nodes

NAME                       STATUS   ROLES   AGE     VERSION
aks-nodepool1-31718369-0   Ready    agent   6m44s   v1.12.8

Since AKS's config will be merged into ~/.kube/config and set to be current context after you run az aks get-credentials command, so you can just set KUBECONFIG to default config also,

$ export KUBECONFIG=~/.kube/config  # then fx will take the config to deloy function

But we would suggest you run kubectl config current-context to check if the current context is what you want.

  • Amazon Elastic Kubernetes Service (EKS) TODO

  • Google Kubernetes Engine (GKET) TODO


fx uses Project to manage the development.


Docker: make sure Docker installed and running on your server.

Build & Test
$ git clone https://github.com/metrue/fx
$ cd fx
$ make build

Then you can build and test:

$ make build
$ ./build/fx -h


Thank you to all the people who already contributed to fx!

metrue pplam muka xwjdsh mbesancon avelino DaidoujiChen chlins andre2007 andre2007


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Package mock_config is a generated GoMock package.
Package mock_config is a generated GoMock package.

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