Host ID.

[Brooks Davis]

On Mon, Apr 09, 2007 at 04:56:20PM +0200, Pawel Jakub Dawidek wrote:
> 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?

Looks good to me.

-- Brooks
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