Re: Host ID.
- From: Brooks Davis <brooks@xxxxxxxxxxx>
- Date: Mon, 9 Apr 2007 11:11:06 -0500
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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