rum in RakuOS 45: package layers, and what sets RakuOS apart from other atomic distributions
November 1, 2026 · News
In RakuOS 45, rum stops writing your packages into one overlay and starts building package layers: separate, read-only, versioned trees over the system image, each with its own package database. Installs apply live, every change can be undone, updates are prepared before you reboot, and every system version you can boot keeps its own apps. Here's how it works, how it compares to Fedora Atomic, bootc, openSUSE Aeon, NixOS and others, and why we think it's the best of both worlds.