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Message-ID: <520E40BB.70006@gmail.com>
Date: Fri, 16 Aug 2013 17:09:47 +0200
From: Alan McKinnon <alan.mckinnon@gmail.com>
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Subject: Re: How hard is it to move separate /usr to / partition? - WAS Re:
[gentoo-user] Optional /usr merge in Gentoo
References: <CAGbLXuV1PpjP5=M8zPD6qiEdMBjQjaZh8y-HyA+ZwYE-PHSrEg@mail.gmail.com> <CAKxh67V_JadMwkY2nZDOeDSQzA6OYq6Fv915U1HKVJUe4wy2-Q@mail.gmail.com> <CAGbLXuWKvg+wjQ807pDm1iPH_nWLeYvKbap3E5Ssocd7uSMT+Q@mail.gmail.com> <520A5446.1050001@mail.ru> <CAGbLXuWdtU+Y+jjqfbMAhzfTdBJOV9yaUzLcCoTAHVEenkFeNg@mail.gmail.com> <520DA782.4050803@sporkbox.us> <CAGbLXuVwFkRD+iQMvUXkWqhn4TyyZ9Zp5zgiXz+Wke=6vv8OAQ@mail.gmail.com> <520E1C9E.70202@libertytrek.org> <CADPrc83DNbnAvk3gHoNW1yDhhNB_e95yd_95wW06-y_+uZLmLA@mail.gmail.com> <520E38AC.4030500@libertytrek.org> <CADPrc83b7h_XqhXmuV_VO4OZcLd+1DxFKYjbcKykDR_dowr7Bg@mail.gmail.com> <520E3F83.7030005@libertytrek.org>
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On 16/08/2013 17:04, Tanstaafl wrote:
> Thanks for the reply Canek
>
> On 2013-08-16 10:48 AM, Canek Peláez Valdés <caneko@gmail.com> wrote:
>> If you have physical access to the system,
>
> I do.
>
>> and a large enough /,
>
> Well...
>
> / is 19GB, with 18GB available.
>
> /usr is 20GB, with 13GB used, with 7.9GB available.
>
> I guess I'd be ok with going from 18GB available on / to just 5GB
> available...
You should be fine with that. A reasonably sane / is quite static, and
/usr tends not to change all *that* much.
There's some precautions I always take on server:
/var, /usr/local, /opt and /tmp are separate mount points
portage moves to /var, not /usr
With those dealt with, the balance of / shouldn't grow much.
>
>> it's really easy. You boot from a livecd, mount /usr in another
>> directory,
>
> Not exactly sure how to do this since /user in on lvm...
>
>> copy all the files from it to /usr (be sure to preserve
>> links, permissions, attributes, etc.),
>
> So, once I have it mounted
>
> cp -rp ... ?
>
>> change /etc/fstab, and off you go.
>
> Currently:
>
>> # NOTE: If your BOOT partition is ReiserFS, add the notail option to
>> opts.
>> /dev/sda1 /boot ext2
>> noauto,noatime 1 2
>> /dev/sda2 none swap
>> sw 0 0
>> /dev/sda3 / ext3
>> noatime 0 1
>> /dev/sda4 /backups ext3
>> noatime 0 2
>> /dev/vg2/home /home reiserfs
>> noatime 0 0
>> /dev/vg2/usr /usr reiserfs
>> noatime 0 0
>> /dev/vg2/var /var reiserfs
>> noatime 0 0
>> /dev/cdroms/cdrom0 /mnt/cdrom iso9660
>> noauto,ro 0 0
>> /dev/fd0 /mnt/floppy auto
>> noauto 0 0
>>
>> # NOTE: The next line is critical for boot!
>> none /proc proc
>> defaults 0 0
>
> So, just remove the line referencing /usr?
>
>> And really, maybe you could try an initramfs? It will be much more
>> easy than any juggle of filesystems.
>
> I always compile my kernels manually, by choice - so, no desire to use
> genkernel or dracut.
>
> How would I then create one? I am *not* a programmer, just a reasonably
> competent general sys admin.
>
> Is there a 'generic' one that I can use? Or is there a separate tool
> that will create one based on my system profile (or whatever)?
NAFC. I'm like you and don't built initramfses. The only ones I have are
ones that RH shipped :-)
>
> Thanks again
>
--
Alan McKinnon
alan.mckinnon@gmail.com