On Wed, Mar 6, 2013 at 4:40 PM, Tim Evans <tkevans at tkevans.com> wrote: > We are replacing four servers, running mail, web, ftp, and dns, > respectively, with a single server to run all four services. > > The new server will have a new IP address. > > It seems fairly straightforward to redirect mail, web, and ftp services > to the new server via DNS CNAMES, but I'm not quite sure about how to do > the change for the DNS service itself. > > Is there a need to maintain the old DNS server's IP address during a > transition, or longer? Via a virtual IP with the old DNS server's IP > address on the new machine, perhaps? Or a second NIC with the old > address? Or just have the router redirect incoming DNS requests? > > Thanks. > -- > Tim Evans | 5 Chestnut Court > Linux/UNIX Consulting | Owings Mills, MD 21117 > http://www.tkevans.com/ | 443-394-3864 > tkevans at tkevans.com > _______________________________________________ > CentOS mailing list > CentOS at centos.org > http://lists.centos.org/mailman/listinfo/centos > Hi Tim, To migrate the DNS server, ideally the steps as follows, - Provision the new server and setup as the secondary DNS server - Sync the zones - Reduce the TTL of the nameservers - Change the new server to primary - Change the glue DNS records (from domain registrar panel - if applicable) - Let the old server running for few days and monitor for any traffic Regards, Vipul