DHCP Failover and dhcpd.leases
M.Kueppers at douglas-informatik.de
Fri Apr 13 11:28:05 UTC 2012
I'm currently using a single DHCP server from which I periodically sync the dhcpd.leases file to a second backup DHCP where the deamon is not started. That's my cold standby failover.
Now I want to use the ISC-DHCPs build-in failover system which I already successfully configured and tested in a testing environment.
My question is, what happens to the leases database when the server is in failover mode?
Are all leases written to the file on both server peers or only those which were handed out by the failover peer? Clearly, do both servers have the same leases file?
I built some software around the leases database an so I rely on having all active leases in it.
Another question is, if I change my running config on the productive server to do ISC failover, how does this affect already given out leases? Are they simply synced to the secondary peer?
Thanks in advance!
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