Gentoo Archives: gentoo-user

From: Neil Bothwick <neil@××××××××××.uk>
To: gentoo-user@l.g.o
Subject: Re: [gentoo-user] /dev/sda* missing at boot
Date: Wed, 07 Sep 2011 23:56:17
Message-Id: 20110908005500.58ef10fa@zaphod.digimed.co.uk
In Reply to: Re: [gentoo-user] /dev/sda* missing at boot by "Canek Peláez Valdés"
1 On Wed, 7 Sep 2011 19:04:17 -0400, Canek Peláez Valdés wrote:
2
3 > > Putting it on a logical volume is one advantage, allowing /usr to be
4 > > resized should the need arise.
5 >
6 > Why not allow / to be resized entirely? You probably will take the
7 > machine off-line anyway.
8
9 Because you can't boot from an LV, so you'd than need a separate /boot
10 and an initramfs. Without LVM, you are unlikely to be able to resize /
11 or /usr as it is not usually the last partition on the drive.
12
13 > >> Mounting it read-only
14 > >> seems the only sensible one, and then I think is better to go all the
15 > >> way and mount / read-only.
16 > >
17 > > Putting /etc on a read-only filesystem seems a really bad idea.
18 >
19 > mount -o remount,rw /
20 > emerge --sync && emerge -uDNv world
21 > dispatch-conf
22 > mount -o remount,ro /
23 >
24 > Or, if you only want to modify some configuration file (which in a
25 > sane environment doesn't happen that often):
26 >
27 > mount -o remount,rw /
28 > adduser fulano ...
29 > mount -o remount,ro /
30
31 This is longer than the init script needed in an initramfs. I wonder what
32 problems you'd have when booting as the kernel tries to update the likes
33 of /etc/mtab on a read-only fs.
34
35 > Again, I don't see the reason for a separated /usr.
36
37 That doesn't mean there aren't several valid reasons to do so.
38
39 > But *again*, if
40 > that's what you want, you will be able to do it. You will just need an
41 > initramfs.
42
43 I neither have nor need one at the moment, which means this update will
44 break my system.
45
46
47 --
48 Neil Bothwick
49
50 Last words of a Windows user: = Where do I have to click now? - There?

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Replies

Subject Author
Re: [gentoo-user] /dev/sda* missing at boot "Canek Peláez Valdés" <caneko@×××××.com>
[gentoo-user] Re: /dev/sda* missing at boot Alberto Luaces <aluaces@×××.es>