Re: default LUKS/LVM names
On 10 May 2013 04:41, Luca Capello <luca@pca.it> wrote:
> Hi there!
>
> On Wed, 08 May 2013 11:00:34 +0200, Dmitrijs Ledkovs wrote:
>> On 6 May 2013 06:04, Paul Wise <pabs@debian.org> wrote:
>>> The current default names for an LVM on LUKS setup are:
>>>
>>> <disk>_crypt
>>> <host>-root
>>> <host>-swap_1
>>>
>>> I would like something more consistent like these:
>>>
>>> <host>-crypt
>>> <host>-root
>>> <host>-swap
>>>
>>> Any thoughts?
>>>
>>
>> Something consistent and sensible would be nice.
>
> While I was agreeing with Paul when I read his email, then I came to the
> conclusion that <disk>_crypt and <host>-* are two different things, so
> having different names is reasonable.
>
> I agree, however, that there is no reason to use 'swap_1' and that
> '<partition>' (not <disk>) is ugly:
> =====
> $ ls -l /dev/mapper/
> total 0
> crw------T 1 root root 10, 236 May 7 15:31 control
> lrwxrwxrwx 1 root root 7 May 7 15:31 gismo-home -> ../dm-3
> lrwxrwxrwx 1 root root 7 May 7 15:31 gismo-root -> ../dm-2
> lrwxrwxrwx 1 root root 7 May 7 15:31 gismo-swap -> ../dm-1
> lrwxrwxrwx 1 root root 7 May 7 15:31 sda2_crypt -> ../dm-0
> $
> =====
>
I see, true.
>> Someone had a host / device name clash, and thus e.g. for LVM VG I
>> added to use a suffix "-vg" in ubuntu and planning to push a similar
>> change to debian, as otherwise unattended installations were failing
>> and were not exactly unattended.
>
> IIRC VG names with '-' inside are shown as '--' in /dev/mapper/ to
> differentiate between '-' *within* the name as '-' in VG-LV, which is
> quite ugly by default IMHO.
>
Tell--me--about-it. =)
>> ps. hostnames are often pre-assigned by dhcp in fully automated installations.
>
> This is something you can control, either on the DHCP side or in the
> preseed.
>
Sure, it's just I'd rather have some sort of fallback or more
bulletproof way to complete the install.
In the case when a vg name was not pre-seeded, nor was the hostname,
the "automatic" auto-select defaults can end up clashing with real
device names. '-vg' suffix to the auto-selected vg name was a
minimalistic hack to bypass the problem. I have tried to come up with
a better / cleaner solution, but didn't come up with anything more
elegant for the case of VG name clashes (from a pressed, from user
entry, from auto-generated name) with an existing device name.
Regards,
Dmitrijs.
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