Date: Sat, 07 Apr 2007 18:47:41 +0200 From: Pawel Worach <pawel.worach@gmail.com> To: Pawel Jakub Dawidek <pjd@FreeBSD.org> Cc: freebsd-arch@FreeBSD.org Subject: Re: Host ID. Message-ID: <4617CB2D.8000508@gmail.com> In-Reply-To: <20070407120656.GD63916@garage.freebsd.pl> References: <20070407120656.GD63916@garage.freebsd.pl>
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Pawel Jakub Dawidek wrote:
> Hi.
>
> After initial discussion on IRC, I'd like to propose an addition...
> I want to use it with ZFS, but I thought it may be useful in general, so
> here it goes:
>
> I'd like to assign a unique ID to the system on first boot.
>
> When system starts, /etc/rc.d/hostid script checks if /hostid file
> exists, if it doesn't, it creates it via 'uuidgen > /hostid'.
>
> It will also set kern.hostuuid sysctl to this value and first four bytes
> of MD5(kern.hostuuid) will be stored in kern.hostid. It will allow to
> use gethostid(3).
>
> If root file system is read-only, different uuid will be genrated on
> each boot. Not sure if anything better can be done here.
>
> As I said, I think it may be genrally useful. Imagine using it with
> magic/variant symlinks, for example.
>
> Comments?
>
What about ...
# kenv smbios.system.uuid
63F8BC81-475C-11CB-A074-CA3B9005F8F6
Not all systems have SMBIOSen but maybe it can be used instead of
/{,etc}/hostid if available ?
Regards
--
Pawel
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