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Date: Thu, 17 Oct 2013 03:46:33 +0200
Message-ID: <CAMwbjeVAE7d7sfvvrh-8+HTOn90dDjocJNcjs2Sc2DhzafCP4w@mail.gmail.com>
Subject: Re: [gentoo-embedded] planning a flash DOM x86 embedded system
From: Grzegorz Borowiak <gborowiak@gmail.com>
To: gentoo-embedded@lists.gentoo.org
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Every directory, which needs to be writable and persistent, needs to be
mounted as unionfs or AUFS, with one branch in read-only partition, and the
second one somewhere in /var. It's good to mount /etc that way and place
the factory defaults in the read-only branch of this. An alternative is to
allow only several files in /etc to be writable and move them to someplace
in /var (e.g. /var/etc) and leave symlinks in /etc (e.g. /etc/resolv.conf
-> /var/etc/resolv.conf).
On Wed, Oct 16, 2013 at 2:48 PM, Francisco Ares <frares@gmail.com> wrote:
> Hi.
>
> I am planning to build a system to be deployed in a SATA flash disk, and
> most of the file system will be read-only. There will be a tempfs on /temp
> and a read-write partition for /var (perhaps a unionfs with the static part
> of /var and that read-write partition)
>
> Is there any resources on how to do this using Gentoo?
>
> There is already a development system with everything working as expected
> on the final system. But when I put it to a squashfs, the system boots with
> several errors, like when trying to write to /etc and /var.
>
> Looking on the new issue regarding /usr and / being on a different
> partitions, I have found the file in /etc/initramfs.mounts. I have added
> the needed fstab entries to be mounted before the system switches to the
> real-root, (as the comments on top of this file claims) but there are
> still errors during boot.
>
> Thanks
> Francisco
>
--e89a8fb1f748caf9b704e8e5fcef
Content-Type: text/html; charset=ISO-8859-1
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<div dir=3D"ltr">Every directory, which needs to be writable and persistent=
, needs to be mounted as unionfs or AUFS, with one branch in read-only part=
ition, and the second one somewhere in /var. It's good to mount /etc th=
at way and place the factory defaults in the read-only branch of this. An a=
lternative is to allow only several files in /etc to be writable and move t=
hem to someplace in /var (e.g. /var/etc) and leave symlinks in /etc (e.g. /=
etc/resolv.conf -> /var/etc/resolv.conf).<br>
</div><div class=3D"gmail_extra"><br><br><div class=3D"gmail_quote">On Wed,=
Oct 16, 2013 at 2:48 PM, Francisco Ares <span dir=3D"ltr"><<a href=3D"m=
ailto:frares@gmail.com" target=3D"_blank">frares@gmail.com</a>></span> w=
rote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex"><div dir=3D"ltr"><div><div><div><div>Hi.<br>=
<br></div>I am planning to build a system to be deployed in a SATA flash di=
sk, and most of the file system will be read-only. There will be a tempfs o=
n /temp and a read-write partition for /var (perhaps a unionfs with the sta=
tic part of /var and that read-write partition)<br>
<br></div>Is there any resources on how to do this using Gentoo?<br><br></d=
iv>There is already a development system with everything working as expecte=
d on the final system. But when I put it to a squashfs, the system boots wi=
th several errors, like when trying to write to /etc and /var.<br>
<br></div><div>Looking on the new issue regarding /usr and / being on a dif=
ferent partitions, I have found the file in /etc/initramfs.mounts. I have a=
dded the needed fstab entries to be mounted before the system switches to t=
he real-root, (as the comments on top of this file claims)=A0 but there are=
still errors during boot.<br>
</div><div><br></div>Thanks<span class=3D"HOEnZb"><font color=3D"#888888"><=
br>Francisco<br></font></span></div>
</blockquote></div><br></div>
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