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Re: Some notes on the next generation LTSP (getting LTSP into Debian/main)

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On 05-07-2005 12:41, Petter Reinholdtsen wrote:
> [Jonas Smedegaard]
>>Did I mention initrd-netboot-tools ?
> Yes, but it seem to be solving a different problem, the problem of
> booting with an NFS root.  unionfs is supposed to solve the problem of
> having to redirect all files to tmpfs when the file system is
> read-only.  Or am I mistake?

Off course. Sorry.

For this problem, I suggest looking at flashybrid.

That package does redirection of selected subdirs of ro rootfs to  a rw
location. The current goal of that package is use of a USB stick as
harddrive and temporarily attach a real harddrive - so in addition to
the list we need of subdirs that can be trashed on reboot there is also
subdirs that need only be accessible at maintainance (not for normal
runs) which we can ignore for now.

Today flashybrid uses tmpfs and hand-edited conf(ig)files for list of
subdirs that needs redirection.

Tomorrow the list could be debconf-enabled.

Next week (or whenever those are ready) it could be enhanced to use
better methods like unionfs. The choice of method is off course
debconf-enabled: Ubuntu has unionfs in their official kernels already so
could choose that method, Debian whould perhaps use tmpfs for some time,
but the local admin (or other CDDs) would perhaps invent another method
even more clumsy but using less memory so better usable on really old
hardware with current official Debian kernels.

Oh, and about the other list of things available only for maintainance:
I don't know about LTSP, but Lessdisks could use this mechanism (the
main purpose of flashybrid) for customizing directly from a thin client.
Currently it is highly insecure (needs rw NFS) but I expect same
infrastructure could be used for secure filesystems like OpenAFS as
well, when we get to manage to support those as rootfs.

 - Jonas

- --
* Jonas Smedegaard - idealist og Internet-arkitekt
* Tlf.: +45 40843136  Website: http://dr.jones.dk/

 - Enden er nær: http://www.shibumi.org/eoti.htm
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