Faasta: a Faster FaaS Platform

Faasta is a cutting-edge Function-as-a-Service (FaaS) platform designed for exceptional speed and efficiency. With cold start times under 1ms and a memory overhead of less than 1KB, Faasta runs native Linux shared libraries under strong per-request isolation.

Key Features

• Builds your Rust handlers into native x86_64 Linux shared libraries (.so)
• Uses the #[faasta] macro and strongly typed request/response primitives
• Provides secure per-request isolation with kvmserver
• Achieves ultra-fast cold starts without the overhead of traditional containerization
• Self-hostable with simple setup - run your own Faasta instance anywhere
• Powered by KVM + TinyKVM for fast reset and isolation
• Includes a free hosted instance at faasta.lol

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Getting Started

Install the Faasta CLI:

cargo install cargo-faasta

Create a new Faasta project:

cargo faasta init
# or
cargo faasta new my-function

Build your function:

cargo faasta build

Login with your GitHub account:

cargo faasta login

Deploy your function:

cargo faasta deploy

Your function will be available at https://your-function-name.faasta.lol

Runtime Model (KVM Server)

Faasta runs functions as native Linux code and isolates requests using kvmserver:

• The CLI builds a .so artifact (x86_64-unknown-linux-gnu)
• The server launches functions through kvmserver
• kvmserver uses TinyKVM snapshots for fast request isolation and reset

For self-hosting, see:

• KVM server docs
• Faasta server setup

Self-Hosting

Faasta is fully self-hostable. The provided systemd setup runs:

• /opt/faasta/faasta-server (control plane / routing)
• /opt/faasta/kvmserver (request execution runtime)

⚠️ Experimental Status Faasta is currently experimental. There will be breaking changes that will interupt service on the faasta.lol instance.