Ask HN: Open Source Self-Hosted FaaS Software

Can anyone recommend a well-regarded open source FaaS solution that I can host myself on Linux? I've ran into some limitations with AWS Lambda (primarily IPv6 support) [1][2] so I'm looking for alternatives and I want to break away from AWS a bit as well, so this would be a good experiment. The ability to schedule the functions to execute periodically (minute, hourly, daily, etc.) and to run tens of thousands (or more) would be required. I primarily use Go and some Python 3 functions in Lambda.

Thanks for any feedback.

[1] - https://forums.aws.amazon.com/thread.jspa?messageID=771807

[2] - https://stackoverflow.com/questions/41694477/how-to-call-a-ipv6-rest-service-over-aws-lambda