Re: Host ID.
- From: Robert Watson <rwatson@xxxxxxxxxxx>
- Date: Sun, 8 Apr 2007 10:54:34 +0100 (BST)
On Sun, 8 Apr 2007, Dag-Erling Smørgrav wrote:
Pawel Jakub Dawidek <pjd@xxxxxxxxxxx> writes:If we move disks with root file system, it's this more or less the same host, isn't it?
No. I recently installed three servers by replicating the disk from a fourth and changing the host name and IP address in rc.conf.
Yes, one of the nice properties of FreeBSD -- as opposed to, say, Windows, is that it's trivial to install a hundred boxes by dropping the same image onto all of them and configuring host-specific parameters using DHCP. But there is a tricky tension here: the notion of a persisting host ID is very useful, in the a similar way to the way in which a persisting SSH host key is useful. If we're going to adopt a host ID model, we may want to make generation and configuration of the host ID conditional on an explicit variable in rc.conf (i.e., hostid_enable="YES" which causes it to be generated the first time and loaded future times, similar to SSH keys), and make it very easy to force a regen. That way, you can image the boxes with the rc.conf setting set, but they don't generate host IDs until they boot the first time.
Robert N M Watson
Computer Laboratory
University of Cambridge_______________________________________________
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