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Another really nice Immutable Linux system that I'm using is VyOS.. It's targeted primarily at a router OS, but you can run containers on it now to make it pretty versatile.

Basically, it's an image based OS that configures everything from a single config file on boot. https://docs.vyos.io/en/latest/introducing/about.html

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Same thing for OpenWrt I think. I believe it works by using a squashfs and tmpfs and using overlayfs to overlay the tmpfs on top of the r/o filesystem. But I'm not sure that fits the definition used here for immutable OS:

> We could say that a Linux LIVE-CD is immutable, because every time you boot it, you get the exact same programs running, and you can't change anything as the disk media is read only. But while the LIVE-CD is running, you can make changes to it, you can create files and directories, install packages, it's not stuck in an immutable state.

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