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<TITLE> [Mageia-dev] GRUB can't see HD from chroot unless parent /dev is bind-mounted in chroot ?
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<H1>[Mageia-dev] GRUB can't see HD from chroot unless parent /dev is bind-mounted in chroot ?</H1>
<B>Colin Guthrie</B>
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TITLE="[Mageia-dev] GRUB can't see HD from chroot unless parent /dev is bind-mounted in chroot ?">mageia at colin.guthr.ie
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<I>Wed Jan 16 22:17:46 CET 2013</I>
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<PRE>'Twas brillig, and AL13N at 16/01/13 19:48 did gyre and gimble:
><i> Op woensdag 16 januari 2013 11:30:27 schreef Liam R E Quin:
</I>>><i> On Wed, 2013-01-16 at 16:24 +0000, Colin Guthrie wrote:
</I>>>><i> Personally I've been bind mounting /dev, /proc and /sys for years
</I>>>><i> whenever doing any rescuecd etc. stuff. Partly because I have several
</I>>>><i> LVM volumes where a static /dev/ wouldn't help anyway...
</I>>>><i>
</I>>>><i> But bind mounting /dev has just been part of my chroot routine for as
</I>>>><i> long as I remember.
</I>>><i>
</I>>><i> Knowing about this would have saved me several days after trying to
</I>>><i> install the mageia beta (I now have it running with the
</I>>><i> 3.6.5-tmb-desktop-3.mga3 kernel as the 3.8 one is broken without a fix
</I>>><i> to the recursive panic problem, which is fixed upstream). It's not
</I>>><i> obvious to people who don't do it often :-)
</I>>><i>
</I>>><i> Why not add a command to the rescue disk,
</I>>><i> bind-mount dir - mount /dev, /proc and /sys as /dir/dev etc for chroot
</I>>><i>
</I>>><i> Liam
</I>><i>
</I>><i> because in fact, it's not really the correct solution (and there's multiple
</I>><i> solutions for this too)
</I>><i>
</I>><i> A) mount --bind solution (in fact, only /dev is required) ; mount /proc and
</I>><i> /sys can be done inside.
</I>
True. Tho' I've always favoured the bind mount for some unknown reason :)
><i> B) in fact, udev people told us for a while now, you'd better just run udev
</I>><i> inside the chroot, instead of mount --bind 'ing it.
</I>
Really? I could swear Kay told me recently that it's only really
sensible to run one udevd... Hmm, will ask him again when I see him
online next.
><i> C) of course, udev is not inside systemd, so it appears the new way is now to
</I>><i> somehow spawn a systemd process inside the chroot (maybe systemd-nspawn?)
</I>
Personally I think that's overkill.
><i> oh well, rescuing is for advanced users, so i don't really see the need here.
</I>><i> rescue should be as small as possible anyway.
</I>
Indeedy :)
Col
--
Colin Guthrie
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