Hi again, are there some points in my description that are unclear?
Feedback concerning this setup is very much appreciated! Warm regards, Tom On 23/01/2020 15:08, Tom Fernandes wrote: > Hi, > > I read the old threads regarding dnsmasq and high availability and would > like to know if the following setup is possible or if I'm missing something. > > Master: dnsmasq A (192.168.1.10) > Slave: dnsmasq B (192.168.1.20) > > Loadbalancer virtual IP in ldirectord 192.168.1.30 > > The clients use the virtual IP 192.168.1.30 as their nameserver. > > Host A is a "normally" configured dnsmasq server which also offers DHCP. > > Host B is configured the same way like server A with addition of an > iptables rule which blocks incoming DHCP-Requests. > > The configuration files + the DHCP leases file are on a shared > (active-active) Cluster-FS available to A and B. > > ldirectord is configured with with one realserver (A) and one fallback > server (B). In this configuration a connection to 192.168.1.30 will only > lookup records from host A (as long as A is alive). > > When A goes down, the following will happen: > 1) The fallback server B will be used when clients lookup records from > 192.168.1.30 > 2) The loadbalancer will connect (through ldirectords "fallbackcommand" > with the "start" parameter) via SSH to server B and remove the iptables > rule which blocks incoming DHCP requests and will restart dnsmasq. > > Now server B is offering DHCP and DNS requests in the same way like > server A was doing before. > > When server A gets online again the "fallbackcommand" on the > loadbalancer is called again (this time with the "stop" parameter). It > will now connect to server A and restart dnsmasq and to server B and set > the iptables rule again to block incoming DHCP requests. Server B will > become the fallback server again. > > What do you think? > > Warm regards, > > > Tom > > _______________________________________________ > Dnsmasq-discuss mailing list > Dnsmasq-discuss@lists.thekelleys.org.uk > http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss > _______________________________________________ Dnsmasq-discuss mailing list Dnsmasq-discuss@lists.thekelleys.org.uk http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss
