On 08/20/2012 06:01 PM, David Lang wrote: > ANYCAST has severe limitations on what you can do with it, but CLUSTERIP is > far > more flexible and can work in just about any local active/active problem.
Apples have severe limitations on the amount of orange juice you can squeeze out of them, but oranges are far more juicy. -- in other words, that is misleading at best. Anycast is a router hack so it works over *routed* networks. Clusterip is *link-layer* broadcast so it works on single ethernet segment. One is for keeping core dns servers operational if the Internet breaks, the other is for when ldirectord is "too hard". One is for when multiple servers won't all reply at once because only one of them is visible to the reachable network, the other has a fixed rule that decides which server answers which clients. And so on. -- Dimitri Maziuk Programmer/sysadmin BioMagResBank, UW-Madison -- http://www.bmrb.wisc.edu
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