maybe it's about the defintion of high availability. If you need 99.999999% a DNS based solution will not work. But even Google, Yahoo and others use a short T

maybe it's about the defintion of high availability. If you need 99.999999% a DNS based solution will not work. But even Google, Yahoo and others use a short TTL to switch between their datacenters… So this should be "reliable enough" for nearly everything out there. $ dig www.yahoo.com ;; QUESTION SECTION: ;www.yahoo.com. IN A ;; ANSWER SECTION: www.yahoo.com. 48 IN CNAME fp.wg1.b.yahoo.com. fp.wg1.b.yahoo.com. 2711 IN CNAME eu- fp.wa1.b.yahoo.com. eu-fp.wa1.b.yahoo.com. 33 IN A 87.248.122.122 also: $ dig www.google.com $ dig www.twitter.com $ dig www.cnn.com