Re: [SLE] Looking for a book that describes highly available DHCP setups

Joachim Schrod wrote:

> examples. I'm interested in implementation strategies -- e.g., how to
> manage the shared configuration part if one doesn't use LDAP;

For configuration data that is needed in multiple places, we tend to use
rsync (for few copies) or rdist (for 100s of copies). And some
mechanism on the target side for reloading servers/daemons when the
config changes.

>> Setting up a cluster is another option.
>
> Sadly, no. A `normal' Linux-HA cluster doesn't synchronize the dhcpd
> lease database, and failovers won't work properly without
> synchronization of this state information.

I can understand you want to look into using DHCPs failover stuff, but
your actual objective is achievable using only Linux-HA with drbd. How
this compares to using DHCPs builtin failover stuff, I can't say, but
it works fine.

We don't actually use a redundant DHCP setup - I just tested it a while
ago. IMO, there is little need for a redundant DHCP setup - clients
will keep their addresses after they have expired even if they can't
get an ACK. OK, new clients won't get an address when the DHCP server
is down, but for us that's not worth it.


/Per Jessen, Zürich

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