Host ID.

Pawel Jakub Dawidek pjd at FreeBSD.org
Mon Apr 9 16:35:20 UTC 2007


On Mon, Apr 09, 2007 at 04:01:22PM +0200, Max Laier wrote:
> On Monday 09 April 2007 16:56, 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?
> 
> I suppose:
> 
> > Index: usr.bin/uuidgen/Makefile
> > ...
> > +BINDIR=	/bin
> 
> will be fixed by (repo)copy for the real commit?  Otherwise, no.

kan suggested not to do it: "respect CVS handicaps, please...." :)

-- 
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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