@@ -24,16 +24,20 @@ OpenFaaS is a framework for building serverless functions with Docker which has
* You can make any Docker image into a serverless function by adding the *Function Watchdog* (a tiny Golang HTTP server)
* The *Function Watchdog* is the entrypoint allowing HTTP requests to be forwarded to the target process via STDIN. The response is sent back to the caller by writing to STDOUT from your application.
### Gateway
### API Gateway / UI Portal
* The API Gateway provides an external route into your functions and collects Cloud Native metrics through Prometheus.
* Your API Gateway will scale functions according to demand by altering the service replica count in the Docker Swarm or Kubernetes API.
* A UI is baked in allowing you to invoke functions in your browser and create new ones as needed.
> The API Gateway is a RESTful micro-service and you can view the [Swagger docs here](https://github.com/alexellis/faas/tree/master/api-docs).
### CLI
Any container or process in a Docker container can be a serverless function in FaaS. Using the [FaaS CLI](http://github.com/alexellis/faas-cli) you can deploy your functions or quickly create new functions from templates such as Node.js or Python.
> The CLI is effectively a RESTful client for the API Gateway.
**CLI walk-through**
Let's have a quick look at an example function `url-ping` which connects to a remote web server and returns the HTTP code from the response. It's written in Python.
