failover options

Pete Ehlke pde at ehlke.net
Wed Jan 9 02:33:20 UTC 2002


* Steve Rooke <steve.rooke at cdhb.govt.nz> said, on [020108 17:45]:
> In article <a11u5a$c5c at pub3.rc.vix.com>, heesters at UDel.Edu says...
> > I was wondering what people use for DNS failover. In particular, if one has
> > multiple A records for the same name to different IP addresses (for certain
> > cluster configurations), what are some good solutions for detecting down
> > nodes in the cluster and "disabling" those A records in DNS.
> 
> I use a method of creating CNAME's for each of my services and point 
> them to the primary server. On failover you only need to change the 
> CNAME to the secondary server. I do not use it in an automated way, as 
> some of our systems need more coercing, but via command scripts and you 
> could always use a secure dynamic update which would be a doddle to 
> implement via scripting.
> 
http://www.stanford.edu/~schemers/docs/lbnamed/lbnamed.html

-Pete


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