Host ID.

[Pawel Jakub Dawidek]

On Sat, Apr 07, 2007 at 02:06:56PM +0200, 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.

Here is the patch:

	http://people.freebsd.org/~pjd/patches/hostid.patch

Any objections?

-- 
Pawel Jakub Dawidek                       http://www.wheel.pl
pjd at FreeBSD.org                           http://www.FreeBSD.org
FreeBSD committer                         Am I Evil? Yes, I Am!
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