Date: Sat, 7 Apr 2007 17:07:25 +0400 From: "Andrew Pantyukhin" <infofarmer@FreeBSD.org> To: "Pawel Jakub Dawidek" <pjd@freebsd.org> Cc: freebsd-arch@freebsd.org Subject: Re: Host ID. Message-ID: <cb5206420704070607j7afe5349r180151dac1ec3e92@mail.gmail.com> In-Reply-To: <20070407120656.GD63916@garage.freebsd.pl> References: <20070407120656.GD63916@garage.freebsd.pl>
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On 4/7/07, Pawel Jakub Dawidek <pjd@freebsd.org> 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. Just random thoughts: - It sounds more like a (writeable) root fs ID... - Is Windows-style hardware ID's hashing totally ruled out? - How does it work in other OS'es? (e.g. solaris /bin/hostid) Anyway, it would be a nice feature. It can be leveraged in many cases. Thanks!
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