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Re:Firecracker – Lightweight Virtualization for Serverless C... by sciurus on Tuesday November 27, 2018 @09:28AM (#18542498)
I think with the App Engine Standard generation 2 runtimes you don't have to write to their sandbox anymore. It still has to be one of their supported languages though, instead of any arbitrary server.

https://cloud.google.com/blog/products/gcp/introducing-app-e...

Re:Firecracker – Lightweight Virtualization for Serverless C... by thesandlord on Tuesday November 27, 2018 @12:27PM (#18544388)
Serverless Container support is coming to GCP: https://services.google.com/fb/forms/serverlesscontainers/
Re:Firecracker – Lightweight Virtualization for Serverless C... by chrisbroadfoot on Tuesday November 27, 2018 @01:17PM (#18544976)
Very easy to exec() into an arbitrary binary from these 2nd generation runtimes.

(and, as thesandlord notes below, arbitrary containers is the idea behind g.co/serverlesscontainers)

Disclaimer: I work on GCP.