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What?

Demo of User Mode Linux (UML), packaged with Nix.

UM Linux is Linux ported to itself. Akin to Zephyr RTOS's native_posix.

This demo defines two Nix packages: UML and a root_fs. The UML is very new as of today, kernel 6.10. The root_fs is very old, centos 6.

Why?

UML allows running programs under older or newer kernels than your host system's. UML is great for debugging.

How?

Just run nix-shell to be dropped into a CentOS 6 login TTY.

Note that pkill --exact linux may be handy when you've had enough.

References

https://www.kernel.org/doc/html/v5.9/virt/uml/user_mode_linux.html

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