Definition
Plain language
Amazon's lightweight virtual machine technology used to run isolated workloads quickly.
As stated in the literature
AWS's open-source microVM monitor providing fast-booting VMs with diff snapshotting; baseline against which DeltaBox-style sandbox checkpointing systems report 30x+ speedups.
Why it matters: Fast, isolated sandboxes are essential for running untrusted agent code at scale, and Firecracker sets the bar that newer systems try to beat.
For example, AWS Lambda spins up a fresh Firecracker microVM in tens of milliseconds whenever a serverless function gets called.
Heard on the show
“The best comparable system before this — Firecracker's diff snapshots — sits at roughly five hundred milliseconds to checkpoint and a second and a half to restore.”Episode 068 — The OS Trick That Makes Tree Search Practical for Coding Agents