javajon/faas-netes

Serverless Kubernetes with OpenFaaS (Functions as a Service)

faas-netes

This is a plugin to enable Kubernetes as an OpenFaaS backend. The existing CLI and UI are fully compatible. It also opens up the possibility for other plugins to be built for orchestration frameworks such as Nomad, Mesos/Marathon or even a cloud-managed back-end such as Hyper.sh or Azure ACI.

OpenFaaS also runs well on managed Kubernetes services like AKS and GKE. See our list of tutorials in the documentation site for more.

Watch a video demo from TechFieldDay Extra at Dockercon

OpenFaaS is an event-driven serverless framework for containers. Any container for Windows or Linux can be leveraged as a serverless function. OpenFaaS is quick and easy to deploy (less than 60 secs) and lets you avoid writing boiler-plate code.

In this README you'll find a technical overview and instructions for deploying FaaS on a Kubernetes cluster. (Docker Swarm is also supported in the main project)

• Serverless framework for containers
• Native Kubernetes integrations (API and ecosystem)
• Built-in UI
• YAML templates & helm chart
• Over 11k GitHub stars
• Independent open-source project with over 90 authors/contributors

Get started

• Deploy on Kubernetes
• Visit the website
• Join the community

Note: a CRD-based Kubernetes controller is also available for OpenFaaS in the incubator program - faas-o6s.

How is this project different from others?

• Read an Introduction to OpenFaaS here.

Reference guide

Configuration via Environmental variables

FaaS-netes can be configured via environment variables.

Option	Usage
enable_function_readiness_probe	Boolean - enable a readiness probe to test functions. Default: true
write_timeout	HTTP timeout for writing a response body from your function (in seconds). Default: 8
read_timeout	HTTP timeout for reading the payload from the client caller (in seconds). Default: 8
image_pull_policy	Image pull policy for deployed functions (Always, IfNotPresent, Never. Default: Always

Readiness checking

The readiness checking for functions assumes you are using our function watchdog which writes a .lock file in the default "tempdir" within a container. To see this in action you can delete the .lock file in a running Pod with kubectl exec and the function will be re-scheduled.

Namespaces

By default all OpenFaaS functions and services are deployed to the openfaas and openfaas-fn namespaces. To alter the namespace use the helm chart.

Ingress

To configure ingress see the helm chart. By default NodePorts are used. These are listed in the deployment guide.

Image pull policy

By default, deployed functions will use an imagePullPolicy of Always, which ensures functions using static image tags are refreshed during an update. If this is not desired behavior, set the image_pull_policy environment variable to an alternative. IfNotPresent is particularly useful when developing locally with minikube. In this case, you can set your local environment to use minikube's docker so faas-cli build builds directly into minikube's image store. faas-cli push is unnecessary in this workflow - use faas-cli build then faas-cli deploy.

Note: When set to Never, only local (or pulled) images will work. When set to IfNotPresent, function deployments may not be updated when using static image tags.