Re: Host ID.
- From: Pawel Jakub Dawidek <pjd@xxxxxxxxxxx>
- Date: Sat, 7 Apr 2007 19:54:39 +0200
On Sat, Apr 07, 2007 at 06:47:41PM +0200, Pawel Worach wrote:
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.
Comments?
What about ...
# kenv smbios.system.uuid
63F8BC81-475C-11CB-A074-CA3B9005F8F6
Not all systems have SMBIOSen but maybe it can be used instead of /{,etc}/hostid if available ?
We thought about this, but as you noted it's not always available. I
want this to behave the same on each system.
--
Pawel Jakub Dawidek http://www.wheel.pl
pjd@xxxxxxxxxxx http://www.FreeBSD.org
FreeBSD committer Am I Evil? Yes, I Am!
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