The sauce thickens. Up until recently rump kernels on Xen offered only
the kernel API (i.e. a POSIX'y set of syscalls), but we now also support
a mostly complete user-level API courtesy of an unmodified NetBSD's libc
(just a few build infra modifications which will hopefully go away
soon'ish). Since the kernel services and libc interfaces are directly
from a real OS, a good number of real programs will compile and work
out-of-the-box as standalone Domu's.
As an early proof-of-concept, I've thrown together a domain which boots
as a web server. Try to it out, clone the repo (*), run
"./buildxen.sh", and create a domain with xl create. The service will
configure an IP address for itself using dhcp, and after that it's port
80 as usual.
*) https://github.com/anttikantee/rumpuser-xen/
- antti
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