DHCP failover implementation

Chris Bauer chris.bauer at gmail.com
Fri Jun 21 19:53:54 UTC 2019


I am looking at implementing failover on two existing servers at two
different locations and have several questions.

I would like to set them up so that each of them remains primary for its
location with the other being secondary. If I'm looking at the
documentation correctly, I should be able to set up two failover groups on
different ports with different splits to accomplish this using the same
servers. Is this correct?

I was hoping to implement this gradually per subnet by moving the
statements into include files one at a a time and testing. If this is done
this way, what would the behavior of pools with no failover configuration
if one of the servers moves into a partner-down state?

Also, we are using host declarations to assign static addresses with some
automated scripts that restart the DHCP service when there are changes. I
am concerned about restarting the servers sequentially and the time it will
take the failover to return to a normal state. Is this something I should
be concerned about?

Just as an FYI, these are OEL servers running the ISC DHCPD 4.2.5 package
with approximately 40k leases on one server and 15k leases on the other at
peak usage.

Thank you

"Behold I do not give lectures or a little charity, When I give I give
myself." - Walt Whitman
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