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doc: Explain how to connect to a childhurd.

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* doc/guix.texi (The Hurd in a Virtual Machine): Add instructions for
VNC and SSH access.  Mention childhurd secrets and /etc/childhurd.
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Ludovic Courtès 2020-09-25 23:13:19 +02:00
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@ -25424,16 +25424,41 @@ Return the name of @var{platform}---a string such as @code{"arm"}.
@cindex childhurd
Service @code{hurd-vm} provides support for running GNU/Hurd in a
virtual machine (VM), a so-called ``Childhurd''. The virtual machine is
a Shepherd service that can be referred to by the names @code{hurd-vm}
and @code{childhurd} and be controlled with commands such as:
virtual machine (VM), a so-called @dfn{childhurd}. This service is meant
to be used on GNU/Linux and the given GNU/Hurd operating system
configuration is cross-compiled. The virtual machine is a Shepherd
service that can be referred to by the names @code{hurd-vm} and
@code{childhurd} and be controlled with commands such as:
@example
herd start hurd-vm
herd stop childhurd
@end example
The given GNU/Hurd operating system configuration is cross-compiled.
When the service is running, you can view its console by connecting to
it with a VNC client, for example with:
@example
guix environment --ad-hoc tigervnc-client -- \
vncviewer localhost:5900
@end example
The default configuration (see @code{hurd-vm-configuration} below)
spawns a secure shell (SSH) server in your GNU/Hurd system, which QEMU
(the virtual machine emulator) redirects to port 10222 on the host.
Thus, you can connect over SSH to the childhurd with:
@example
ssh root@@localhost -p 10022
@end example
The childhurd is volatile and stateless: it starts with a fresh root
file system every time you restart it. By default though, all the files
under @file{/etc/childhurd} on the host are copied as is to the root
file system of the childhurd when it boots. This allows you to
initialize ``secrets'' inside the VM: SSH host keys, authorized
substitute keys, and so on---see the explanation of @code{secret-root}
below.
@defvr {Scheme Variable} hurd-vm-service-type
This is the type of the Hurd in a Virtual Machine service. Its value