pivot_root() and FreeBSD

Julian Elischer julian at freebsd.org
Mon Aug 3 03:49:13 UTC 2015


On 3/4/15 12:51 AM, Dirk-Willem van Gulik wrote:
> I am trying to do, in effect an PXE boot/install on a local volume - and would like the machine to cut over into normal running without a reboot*.
>
> So effectively I would like to do the equivalent of pivot_root() and perhaps something special for init(8), and then jettison md, nfs and what not.
>
> Is there any way to do this on 10.1 or -current ? Or has anyone recently done work on Adrian Steinmann his 'Pivot Root for BSD’** ?
>
> Thanks,
there is SOME work going on on a similar thing.. It was in the recent 
project status.

https://www.freebsd.org/news/status/report-2015-04-2015-06.html#Root-Remount

Also have you tried simply using a small memory filesystem loaded with 
the kernel?

>
> Dw.
>
>
> *: the scenario is a set of tests and generation scripts during which there should be no reliance on the network - and where we’d like to avoid a reboot given the state we are bringing the disks and a USB device into.. Thus precluding an NFS mounted install during the test -and- precluding a reboot post install. Yet it is very desirable to have a powercycle use PXE to create a known baseline.
> **: http://www.netbsd.org/gallery/presentations/ast/2012_EuroBSDCon/Talk_PivotRoot4BSD.pdf
>     2012-10-17: Pivot Root (Kernel Module for NetBSD 6.x 20121017) / http://www.netbsd.org/~ast/patches/pivot_root.tbz_20121017
>
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