Dhcpd failover with fixed IP only : thoughts ?

[Glenn Satchell]

Hi Tom

Fixed IP and dhcpd, I assume you mean you use host statements with
fixed-address only? This is the simplest case, run as many dhcpd servers
as you like, ie can do more than 2, each with an identical config. No
failover configuration is needed, no clustering (eg RedHat cluster),
either.

In your routers make sure it sets the dhcp relay to forward to all the
dhcp servers.

Fixed-address is a special case within the server in that it doesn't get
handled like a dynamic lease, so each server can hand out the same address
and it will all "just work".

Use something like rsync/scp to copy the dhcpd.conf to the other servers.

regards,
-glenn

On Sat, September 7, 2013 8:09 am, tom wrote:
> Hi,
>
> I am toying with dhcpd failover at the moment and I am wondering if
> clustering is relevant for fixed IP allocation ?
> Clustering makes a lot of sense for dynamic IP to share the leases but
> assuming you only have to allocate fixed IP, I believe clustering may
> not be necessary and having a delay (min-secs) between dhcpserver1 and
> dhcpserver2 could achieve redundancy as well, isn't it ?
>
> However, I may be missing something so I am open to suggestions and
> thoughts about HA and fixed IP allocation.
>
> PS: I used the word 'clustering' or 'failover' when talking about the
> 'DHCP Failover protocol' feature.
>
> Cheers,
> Tom
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