If the lease files are lost what would be the solution?

John Wobus jw354 at cornell.edu
Wed Apr 25 16:07:03 UTC 2007

Glenn and Frank have some suggestions on the immediate problem you pose.

Stepping back, your DHCP service "design" and configuration can 
your recovery in this situation.

For example, we run a redundant server pair, and an empty lease file is
repopulated from the peer server.  Also, we keep static host 
information out of the
leases file: we keep it in the config which is constructed on and
copied from another server.  Thirdly, our lease time is an hour, which 
costs for being so short, but one benefit is that should we lose both 
lease files at once, the "pain" of recovery would be over in an hour.

John Wobus

On Apr 25, 2007, at 3:56 AM, S Kalyanasundaram wrote:

> Hi all,
> The leases are stored in dhcpd.leases and backup is at dhcpd.leases~. 
> For some reason these files are lost and dont have any kind of backup 
> of them and again server got stopped. Say some hardware fault have 
> come. We will have to restart the dhcpd server without the lease 
> database.
> Does anyone faced this kind of situation. What would be the good 
> suggestion for recovering this problem.
> The problem is, the existing client go for renewal and may be get a 
> new IP address which breaks his (connection, download or whatever). 
> The other case would be new clients have come up and ask for an IP and 
> the server check for a free IP but which is already available and mark 
> as abandon and give some new IP to the new client. When the original 
> client goes for renewal of the IP but that is already marked as 
> abandon. So after that i guess it will get a new IP address.
> I guess there would be some more scenarios.
> Anybody faced this kind of similar problem? Any suggestions are 
> appreciated.
> Thanks in advance,
>  -"kalyan"

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