On 06/27/2013 09:37 AM, Stephan von Krawczynski wrote:
On Wed, 26 Jun 2013 11:04:07 -0400 Jeff Darcy <jdarcy@xxxxxxxxxx>
wrote:
[Jeff on UUIDs]
I generally vote against using UUIDs and for IPs. In runtime I can
easily switch an IP in a replacement situation, but can I switch a
UUID in the same easy manner?
I don't see why that would be problematic. The UUIDs we're talking
about aren't tied to hardware. They're essentially big random numbers
we assign ourselves. IIRC they're just stored in a file, so they can be
trivially copied from a system to its replacement. The problem is
precisely that DNS names and IP addresses aren't good *system*
identifiers. For one thing, they refer to interfaces rather than
systems (which might have many interfaces). For another, even that
association is too transient. Such IDs are convenient for referring to
a system *at a specific point in time* but not permanently, and a
permanent ID for the whole system is something we really need. It sure
would be nice if the networking community would stop ****ing around when
it comes to multi-homed or mobile hosts, but they don't seem inclined to
so the rest of us have to fall back on other established patterns for
identifying hosts separately from their addresses.
