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I know this website which has like 4 servers in 4 different datacenters across the globe (czech republic, estonia, sweden, germany). What happens is as i am browsing this website the server changes meaning he is balancing the server load in realtime among the datacenters.

How is he doing this? What softwares or applications are needed to achieve this?

Any expert advice as to the best practices in achieving this will be ethernally appreciated.

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closed as not a real question by Ward, John Gardeniers, Khaled, Sven, Hubert Kario Jan 12 '13 at 18:31

It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center.If this question can be reworded to fit the rules in the help center, please edit the question.

Do a dig and it becomes pretty clear:

$ dig

; <<>> DiG 9.7.6-P1 <<>>
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 24955
;; flags: qr rd ra; QUERY: 1, ANSWER: 6, AUTHORITY: 0, ADDITIONAL: 0

;           IN  A

;; ANSWER SECTION:        300 IN  A        300 IN  A        300 IN  A        300 IN  A        300 IN  A        300 IN  A

Multiple A records, and a very low (looks like 5 minutes) TTL. Essentially, round-robin DNS.

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pretty interesting..never knew there was such a what exactly does that information mean? – redhatengineer6 Jan 12 '13 at 3:26
+1. So no "balancing the loa in real time among data Centers". Noone does that - it is stupid, because you arem or e bound by latency most of the time. THis is simple "distribute requests, do not care about load on Servers". – TomTom Jan 12 '13 at 8:30

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