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SlimFaas: The Slimmest and Simplest Function-as-a-Service

SlimFaas is a lightweight, plug-and-play Function-as-a-Service (FaaS) platform for Kubernetes (and beyond). It’s designed to be fast, simple, and extremely slim—making it easy to deploy and manage serverless functions with minimal overhead.

Why Use SlimFaas?

• Scale

  • Scale to zero after a period of inactivity.
  • Scale from zero to any number of replicas on demand (supporting standard HTTP triggers).
  • Compatible with Horizontal Pod Autoscalers (HPA), KEDA, and Prometheus metrics.
  • (Coming soon) SlimFaas-integrated autonomous scale-up.

• Synchronous and Asynchronous Functions

  • Simple HTTP endpoints for both sync and async calls.
  • Async mode lets you limit the number of parallel requests and configure retry patterns.

• Jobs

  • Run one-off jobs via HTTP calls, with configurable concurrency and visibility (public/private).

• Private/Public Functions and Jobs

  • Keep internal functions private, accessible only from within the cluster or via trusted pods.

• Publish/Subscribe Internal Events

  • Synchronously send events to every replica of selected functions (with no extra event-bus dependency).

• “Mind Changer” (Status & Wake-up API)

  • A built-in REST API to monitor your functions and wake them up on demand.

• Plug and Play

  • Deploy SlimFaas as a standard pod/StatefulSet with minimal configuration.
  • Just add annotations to your existing pods to integrate them into SlimFaas scaling logic.

• Slim & Fast

  • Written in .NET with a focus on performance and minimal resource usage.

Ready to Get Started?

Check out:

• Get Started – Learn how to deploy SlimFaas on Kubernetes or Docker Compose.
• Functions – See how to call functions synchronously or asynchronously.
• Events – Explore how to use internal synchronous publish/subscribe events.
• Jobs – Learn how to define and run one-off jobs.
• Planet Saver – See how to start and monitor replicas from a JavaScript frontend.
• How It Works – Dive into SlimFaas’s architecture and design.

We hope SlimFaas helps you streamline serverless development!

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Community & Governance

• CNCF Project SlimFaas is proud to be part of the Cloud Native Computing Foundation (CNCF) landscape.

  

• Slack Channel Join our channel on the CNCF Slack to connect with other SlimFaas users.

• Code of Conduct SlimFaas follows the CNCF Code of Conduct.

Enjoy SlimFaas!