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Serverless Functions Made Simple for Kubernetes and Docker
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What is OpenFaaS?

Serverless Functions Made Simple for Docker and Kubernetes
OpenFaaS is a tool in the Serverless / Task Processing category of a tech stack.
OpenFaaS is an open source tool with 24.6K GitHub stars and 1.9K GitHub forks. Here’s a link to OpenFaaS's open source repository on GitHub

Who uses OpenFaaS?

6 companies reportedly use OpenFaaS in their tech stacks, including waylay, DevOPS and Infrastructure, and jjjj.

48 developers on StackShare have stated that they use OpenFaaS.

OpenFaaS Integrations

Pros of OpenFaaS
Open source
Decisions about OpenFaaS

Here are some stack decisions, common use cases and reviews by companies and developers who chose OpenFaaS in their tech stack.

Currently been using an older version of OpenFaaS, but the new version now requires payment for things we did on the older version. Been looking for alternatives to OpenFaas that have Kafka integrations, and scale to 0 capabilities.

looked at Apache OpenWhisk, but we run on RKE2, and my initial install of Openwhisk appears to be too out of date to support RKE2 and missing images from So now looking at Knative. What are your thoughts? We need support to be able to process functions about 10k a min, which can vary on time of execution, between ms and mins. So looking for horizontal scaling that can be controlled by other metrics, than just cpu and ram utilization, but more so, for example if the wait is over 5 scale out.. Issue with older openfaas, was scaling on RKE2 was not working great, for example, I could get it to scale from 5 to 20 pods, but only 12 of them would ever have data, but my backlog would have 100k's of files waiting.. So even though it scaled up, it was as if the distribution of work was only being married to specific pods. If I killed the pods that had no work, they come up again with no work, if I killed one with work, then another pod would scale up and another pod would start to get work. And On occasion with hours, it would reset down to the original deployment allotment of pods, and never scale up again, until I go into Kubernetes and tell it to add more pods.

So hoping to find a solution that doesn't require as much triage, to work with scaling, as points in time we are at higher volume and other points of time could be no volume.

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OpenFaaS Alternatives & Comparisons

What are some alternatives to OpenFaaS?
Build applications comprised of microservices that run in response to events, auto-scale for you, and only charge you when they run. This lowers the total cost of maintaining your apps, enabling you to build more logic, faster. The Framework uses new event-driven compute services, like AWS Lambda, Google CloudFunctions, and more.
Knative provides a set of middleware components that are essential to build modern, source-centric, and container-based applications that can run anywhere: on premises, in the cloud, or even in a third-party data center
nuclio is portable across IoT devices, laptops, on-premises datacenters and cloud deployments, eliminating cloud lock-ins and enabling hybrid solutions.
Kubeless is a Kubernetes native serverless Framework. Kubeless supports both HTTP and event based functions triggers. It has a serverless plugin, a graphical user interface and multiple runtimes, including Python and Node.js.
Write short-lived functions in any language, and map them to HTTP requests (or other event triggers). Deploy functions instantly with one command. There are no containers to build, and no Docker registries to manage.
See all alternatives

OpenFaaS's Followers
230 developers follow OpenFaaS to keep up with related blogs and decisions.