NFSroot using NFSv4?

NFSroot using NFSv4?

[glogow]

Hi

I'm looking for some information on using Linux kernel NFSroot with NFSv4.

>From reading some documentation it seems that there are some additional daemons
involved to mount NFSv4 exports on a client (idmapd, gssd (just for krb5?)).

Is it possible to run NFSv4 as a read-only NFSroot, without an initrd /
initramfs, which would otherwise start these deamons and use a NFSv4 enabled
mount and a pivot_root?

I don't need any security features of NFSv4, as it would just be used for
installing Debain via PXE and FAI.

Thanks

Jan-Marek

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Re: NFSroot using NFSv4?

[Trond Myklebust]

On Thu, 2006-10-26 at 13:15 +0200, glogow@fbihome.de wrote:
> Hi
> 
> I'm looking for some information on using Linux kernel NFSroot with NFSv4.
> 
> >From reading some documentation it seems that there are some additional daemons
> involved to mount NFSv4 exports on a client (idmapd, gssd (just for krb5?)).
> 
> Is it possible to run NFSv4 as a read-only NFSroot, without an initrd /
> initramfs, which would otherwise start these deamons and use a NFSv4 enabled
> mount and a pivot_root?

Not at this point. We may look into providing NFSroot support for NFSv4
if there is enough interest, but at the moment you will at least need an
idmapd in userland running before you attempt to mount the volume.

Cheers,
  Trond


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Re: NFSroot using NFSv4?

[Frank van Maarseveen]

On Thu, Oct 26, 2006 at 01:15:13PM +0200, glogow@fbihome.de wrote:
> Hi
> 
> I'm looking for some information on using Linux kernel NFSroot with NFSv4.
> 
> >From reading some documentation it seems that there are some additional daemons
> involved to mount NFSv4 exports on a client (idmapd, gssd (just for krb5?)).
> 
> Is it possible to run NFSv4 as a read-only NFSroot, without an initrd /
> initramfs, which would otherwise start these deamons and use a NFSv4 enabled
> mount and a pivot_root?

The proper way to do that is actually to put an "/init"  script in
initrd. The kernel won't mount a root filesystem (i.e. no root= parameter)
and leaves it up to the early userspace /init script to setup the root
mount, e.g. /newroot. The last step for /init (being pid 1) is a

	exec chroot /newroot /sbin/init <args>

This can handle much more types of root mounts and avoids the need for
an in-kernel nfsroot.

-- 
Frank

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