(1) Multumesc pentru raspunsurile de pana acum
(2) In cazul load balancing:
On Sat, 1 Dec 2001, Mihai Baciu wrote:
> "3.2. Load Balancing Primitive load balancing can be achieved in DNS
> using multiple A records for one name. For example, if you have three
> WWW servers with network addresses of 10.0.0.1, 10.0.0.2 and 10.0.0.3,
> a set of records such as the following means that clients will connect
> to each machine one third of the time: When a resolver queries for
> these records, BIND will rotate them and respond to the query with the
> records in a different order. In the example above, clients will
> randomly receive records in the order 1, 2, 3; 2, 3, 1; and 3, 1, 2.
> Most clients will use the first record returned and discard the rest."
Ok, sa luam ca ipoteza de lucru situatia de mai sus: trei servere de web.
Fac round-robin pe DNS si clientii merge pe rand.
Dar daca unul din servere de web a murit (crash, system mantaince, etc)?
Daca un client acceseaza www.situl.meu si primeste IP-ul mashinii care e
jos ce se intampla:
(a) clientul primeste eroare
(b) clientul reincearca la alt IP
Logic ar fi ca odata ce clientul a rezolvat numele primind un IP care din
nefericire nu merge, sa dea eroare si gata. Dar se poate sa ma insel?
Daca am dreptate, de aia e DNS load balancing nashpa?
Radu
--
Radu Filip
Network Administrator @ Technical University of Iasi
[EMAIL PROTECTED] Information Technology and Communication Center
http://socrate.tuiasi.ro/ [EMAIL PROTECTED] | http://ccti.tuiasi.ro/
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