Date: Mon, 14 Jul 2008 15:36:53 -0400 From: Mike Meyer <mwm-keyword-freebsdhackers2.e313df@mired.org> To: "Tapan Chaudhari" <tapan.list@gmail.com> Cc: freebsd-hackers@freebsd.org Subject: Re: Can I change the device of the "/" mount point at boot time. Message-ID: <20080714153653.59ecb307@bhuda.mired.org> In-Reply-To: <482257ad0807141218l26cbb95aid91414a3c88a121c@mail.gmail.com> References: <482257ad0807141106m679ec19frd853339637d27a2d@mail.gmail.com> <20080714184030.GA62288@eos.sc1.parodius.com> <482257ad0807141218l26cbb95aid91414a3c88a121c@mail.gmail.com>
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On Tue, 15 Jul 2008 00:48:42 +0530 "Tapan Chaudhari" <tapan.list@gmail.com> wrote: > This is not exactly what I wanted. I will try to elaborate myself. > I am creating my own device which will act as a new boot slice which must be > mounted as '/'. New device will process i/o calls and then redirect the i/o > calls to original device of '/'. Now since I cannot unmount '/' and mount it > again with my new device while system is running, I will have to find a way > to tell kernel to mount my new device as '/' from next time onwards it > boots. > does anyone have suggestions on this? That's pretty much exactly what vfs.root.mountfrom does. Edit /boot/loader.conf to add a line: vfs.root_mountfrom="fstype:devicespec" and you're good to go. The kernel will boot from your default root partition, then remount root using the value of that variable. I.e. - I set mine to "zfs:internal/root" to boot my system to a zfs root. <mike -- Mike Meyer <mwm@mired.org> http://www.mired.org/consulting.html Independent Network/Unix/Perforce consultant, email for more information. O< ascii ribbon campaign - stop html mail - www.asciiribbon.org
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