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On Sep 23, 2008, at 1:07 PM, Alan Clegg wrote: > Theophanis Kontogiannis wrote: >> However É do not see a way to do CNAME based load balancing for www.abc.biz > > Why use cnames? Why not: > > www.abc.biz IN A ip.ad.dr.1 > IN A ip.ad.dr.2 That's not the whole answer, though, because the records would need to be dynamically updated when one or the other IP address changes. Some kind of custom script is required that somehow monitors those addresses and changes them as needed (including removing stale addresses). It might be best to create a subzone (www.abc.biz) that's dynamic, allowing the rest of the abc.biz domain to be static. Maybe a cron job that runs a script like this: #!/bin/bash IP1=$(dig @ns.dyndns.biz a.dyndns.biz +short) IP2=$(dig @ns.dyndns.biz b.dyndns.biz +short) # do something to validate that real IP's were returned, then... cat << EOF | nsupdate -k key.file server a.dyndns.biz update delete www.abc.biz update add www.abc.biz 60 A $IP1 update add www.abc.biz 60 A $IP2 send EOF (Note: Untested, may contain syntax errors, and it's missing a function to validate the IP's.) Chris Buxton Professional Services Men & Mice -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.8 (Darwin) iEYEARECAAYFAkjZV/kACgkQOcbWp2QNGR83oACeOkC7ApO4JhPBmnrOHwko9IgU 8B4Ania7cQPARw7bcZwTBa9AqNZHHl/H =fdBE -----END PGP SIGNATURE-----
