Very easy.
You need at least one virtual ip-address for your DNS- and DHCP-Server.
So lets say you have a Class-C Network 10.0.0.0/24
* Primary DNS / DHCP 10.0.0.251
* Secondary DNS / DHCP 10.0.0.252
Now, you add a virtual IP to your primary DNS - lets say
* Virtual-IP 10.0.0.250
From Secondary you create a Bash-Script that do the following:
* Check the Server-Status by ping the virtual ip-address
* when the ping has failed:
* add the virtual ip-address to your network-configuration
* start dnsmasq
To sync the DHCP-Leases to the secondary server, you need to create a
ssh-key (ssh-keygen) to copy the lease-file without knowing the ssh-passord.
scp 10.0.0.251:/var/dhcp/dnsmasq.leases /var/dhcp/dnsmasq.leases
do this every minute via a crontab.
So, thats it.
Liebe Grüße aus Freilassing,
Michael Rack
RSM Freilassing
--
RSM Freilassing Tel.: +49 8654 607110
Nocksteinstr. 13 Fax.: +49 8654 670438
D-83395 Freilassing www.rsm-freilassing.de
Am 22.12.2011 14:16, schrieb Markus Schöpflin:
Hello,
up to now I have been using Dnsmasq with great success in a medium sized setup
as a DNS/DHCP/TFTP server in a private test bed. It currently serves a few
hundred clients (mostly servers and networking equipment) in four different
LANs.
A few of the clients have statically configured IP addresses but most are
using DHCP with automatic DNS registration.
Now I'm faced with the need to create a fault tolerant setup for DHCP and DNS.
I need at least some kind of backup service for DHCP and DNS which takes over
automatically as soon as the primary server fails. Is this kind of setup
supported somehow with Dnsmasq? Or should I be looking into migrating to the
ISC DHCP server and the Bind DNS server for this?
Regards,
Markus
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