Function as a service - kubernetes

Runs a docker image in a kubernetes cluster and prints its output

$ go get github.com/jwendell/fnkube

# Runs the perl image and prints π with 100 places
$ fnkube -image perl -- perl "-Mbignum=bpi" -wle "print bpi(100)"
3.141592653589793238462643383279502884197169399375105820974944592307816406286208998628034825342117068

Run fnkube -help for more options and examples.

Concepts behind it

What fnkube does it really simple: It just spawns a Kubernetes Job that runs the specified image in a container and grabs its output. After that it deletes the Job and pods created for this task, unless it's told to not do this (-cleanup=false option). All you need is a kubernetes (or openshift) instance available and permissions to access it.

As a library

You can incorporate fnkube into a bigger application just by importing "github.com/jwendell/fnkube/pkg/fnkube" and calling the function fnkube.Run(options) whereas options is the struct fnkube.Options. Take a look at how main.go uses it.