Hi group,
I have a UML (user-mode Linux) related question :
My problem is that I can't grasp the hostfs-related information I gather from
around the net, especially from official sources where this topic seems under
documented AFAIK.
I would like the UML kernel to consider a host directory structure (and not a
loop-mounted file) as its root device.
How can I do that ? For the sake of simplicity in regards of rights mangling by
hostfs, let's assume that I run UML under the root account of the host.
Whenever possible, give me the accurate source (URL, ...) of the
references/guides/manuals/information on which you rely to solve my problem.
Let's imagine I have some /root/UMLs/Station0 DIRECTORY whose TREE structure
(subdirectories and files) is exactly the CONTENTS of a working system.
Before going any further, say me what is the proper command line to have the
UML kernel boot on my root hostfs mount ( /root/UMLs/Station0 host directory )
, regardless whether the boot process will complain LATER about missing
modules, underpopulated /dev , invalid '/' fstab entry, and the likes... . Note
that I am using up-to-date Debian GNU/Linux 4.0 ('Etch' release, stable branch)
on x86 (32-bit) architecture; what comes of my command line, then?
As an option and if you know well the UML packaging from my distribution and
revision, then read then following depiction of my 'working' tree structure and
answer the question in the end.
I mean there are ./sbin ./bin ./etc ./dev ./usr ./tmp ./root ./proc ./sys ./var
and optionally ./home directories.
I mean there is no ./boot directory since the kernel and initrd (if any) are
loaded from outside the tree structure under /root/UMLs/Station0 .
I don't say here whether there are the proper kernel modules installed under
the /root/UMLs/Station0 tree matching the UML kernel I want to boot. Should
this location be the ./usr/lib/modules/<kernel_version> tree subdirectory or
what else?
QUESTION: Could you please brief me on which modules are important for procfs
and devfs (devfs->tmpfs indeed?), and if there are some hostfs and/or
~host_rootfs~ modules I must put in my external initrd , and whether I have to
put them is the /root/UMLs/Station0 tree structure or not ?
I thank you in advance to help me grasp all this overcomplicated under
documented machinery.
Sincerely,
Valentin.
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