Distribution of load by DNS
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Back to "Domain Name System"DNS permits it that several IP addresses can be assigned to a name. Formulates more general: Several records with same label, same class and same type can exist to resource however to different in each case data field. A such arrangement is called resource record set.
By resource record set can be realized a simple distribution of load (also Loadbalancing called).
- Example:
server.example.com. 1800 IN A 171.17.6.70 server.example.com. 1800 IN A 171.17.6.71 server.example.com. 1800 IN A 171.17.6.72are queried a such name by a resolver, then the DNS server returns the delivery in principle all well-known IP addresses, however in changing order. The first Request is then answered for example with [171.17.6.70, 171.17.6.71, 171.17.6.72] and second with [171.17.6.71, 171.17.6.72, 171.17.6.70]. It lies then in the responsibility of the resolver, which IP address it actually uses.
After which strategy a DNS server gives the order, can with bind-compatible name servers are configured. With BIND are possible for three variants: cyclically, coincidentally and firmly. With the variant the IP addresses in the order are returned firmly, in which they abliegen in the name server.
Note: With reversen zones of in ADDR ARPA domain a Loadbalancing is not possible, although for a IP address several names can be defined. A distribution of load would make also no sense here.
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