On Mon, 14 Nov 2005, Luke Dean wrote:
I've recently upgraded to version 6, and I'm using the new dhclient.
It seems to be working happily, but I've noticed that
/var/db/dhclient.leases.rl0 just keeps growing and growing, with new leases
being added to the end. Leases that expired several hours ago remain in the
file.
According to the manpage for dhclient.leases, this database is supposed to
contain only leases that are "still valid", yet the expiration time on many
of them has long since passed.
Is there a bug, a misconfiguration, or am I responsible for setting up my own
script for purging this thing? I can't find any cron-driven script that
cleans up this file, so I'm wondering if dhclient is supposed to handle this
itself, and if so, when?
I haven't gotten any replies to this, but now that more time has passed I
see that dhclient is cycling the contents of the leases file. There's
about twenty leases in there all the time. Some of them have expired and
some are planned many hours out into the future. I don't know when it
cycles the leases or what the meaning of the far-future leases are, but
it's working and cleaning up after itself somehow, so I'll shut up now.
If somebody would like to explain how dhclient cycles through these leases
though, I'd appreciate it. The manpages aren't enough to make me
understand the process.
I do have one practical reason for wanting to understand this. When I
need to take the server down for maintenance, I like to know when my IP
lease is due to expire. This lets me know how much time I can be
offline before I lose my IP address. With the old dhclient that only had
one lease in the file, the answer was obvious.
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