"Using Btrfs subvolumes, the system maintains two complete system states -- labeled "blue" and "green." Only one state is active at any time, so atomic updates and rollbacks can occur with the highest level of reliability. For example, if you're using the blue environment, updates are applied to the green environment and then tested. You can then switch from the blue to the green environment during a reboot. In other words, you will always have a working instance of your OS, without fail."
"Operating system security has always been a hallmark of Linux. With the introduction of immutable distributions -- CoreOS, launched in 2013, was among the first -- no other operating system could come close to the level of security Linux had to offer. I welcome any opportunity to test a new immutable Linux distro. Over the weekend, I discovered ShaniOS. Also: Immutable Linux delivers serious security - here are your 5 best options ShaniOS is an Arch-based Linux distribution that is immutable and includes Flatpak integration."
ShaniOS is an Arch-based immutable Linux distribution featuring an immutable core and Flatpak application management. The system implements blue/green deployment using Btrfs subvolumes that maintain two complete system states, allowing atomic updates and reliable rollbacks while ensuring one working instance remains active. The shani-deploy command downloads updates for the inactive environment, applies them without impacting the active environment, and configures the bootloader to boot the updated environment. Security features include AppArmor profiles, firewall configurations, and full-disk encryption. Performance optimizations include dynamic swap file creation and Nvidia GPU support. ShaniOS is available for free download and use.
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