Migrating to Failover

Simon Hobson dhcp1 at thehobsons.co.uk
Tue Sep 15 15:41:46 UTC 2009

Norman Elton wrote:

>So when I fire up a server with a new subnet, it looks like the lease
>files are automatically populated with "free" or "backup" entries.
>Interestingly, the entire pool has lease entries marked "free". The
>second half of the pool has a second lease entry marked "backup". I
>guess these second leases take precedence, allowing the secondary
>server to use the backup entries?
>I'm testing some scenarios now, but can I append my real leases to the
>end of this generated file? Or do I need to append them before these
>entries are generated?

Ideally you'd append the real leases before firing up the servers 
with the new subnet. The file is a log format - ie entries are only 
ever appended - and I assume it is only ever read beginning to end 
with any new occurrance of a lease replacing any previous one read. I 
was wondering how timestamps would affect reading in the leases (at 
least some of your real leases will be older than the new empty 
ones), but it probably doesn't matter.

Simon Hobson

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