On 05.08.10 17:17, listus...@gmail.com wrote: > We are in preparation to migrate all zones from a Bind 8 server to a Bind 9 > server. The Bind 9 servers are up and running in production. On the Bind 8 > server, we have a domain that has a very large zone file, it contains around > 1,000 resource records.
couldn't you just replace bind8 with bind9? > Ordinarily we would do AXFR from the Bind 9 server, check to make sure all > the records resolve correctly, and then do the registrar update. For a very > large zone, is there any migration strategy involved to ensure a smooth > transition? > > Someone suggested to do it in 2 steps by adding an additional hop, that is: > > 1) replicate the zone from the Bind 8 server to the Bind 9 server > 2) replace the zone file on the Bind 8 server to something like this: > > company.com. 3600 IN NS Bind9NS1.company.com. > company.com. 3600 IN NS Bind9NS2.company.com. > > So the Bind 8 server is still authoritative, but it simply redirects DNS > queries to the Bind 9 server. After everyone is happy, make the Bind 9 > server authoritative for this domain. Is there any advantage doing it this > way? I think this would not work. bind 8 would still behave as authoritative for the domain and would return NXDOMAIN answers. > Another suggestion was to reduce the TTL value to 10 minutes or lower, so if > anything goes wrong that requires rollback it would not take ages. However, > the TTL of NS records in the global TLD servers are all set to 172800 > seconds (48 hours), so no matter how low the TTL is it can still take up to > 48 hours to correct a problem if it involves redelegation, right? correct. -- Matus UHLAR - fantomas, uh...@fantomas.sk ; http://www.fantomas.sk/ Warning: I wish NOT to receive e-mail advertising to this address. Varovanie: na tuto adresu chcem NEDOSTAVAT akukolvek reklamnu postu. I just got lost in thought. It was unfamiliar territory. _______________________________________________ bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users