Load Balancing Your Web Site (Web Techniques, May 1998)

1   ;;
2   ;;  db.foo.rr -- BIND DNS zone file for the rr.foo.dom domain
3   ;;
4
5   ;;
6   ;;  the start of authority (SOA) resource record which
7   ;;  forces a minimal time-to-live (TTL) for this zone file
8   ;;
9   @  IN  SOA world.foo.dom.  root.world.foo.dom. (
10             1998021501 ; SERIAL
11             3600       ; REFRESH: Secondaries refresh after 1 hour
12             600        ; RETRY:   Secondaries retry after 10 minutes
13             3600       ; EXPIRE:  Maximum TTL of Data is 1 hour
14             1800       ; MINTTL:  Minimum TTL of Data is 30 minutes
15                       )
16
17           IN  NS      world.foo.dom.
18
19   ;;
20   ;;  the multiple canonical name (CNAME) resource record
21   ;;  which implies BIND's Round-Robin (RR) feature
22   ;;
23   www     IN  CNAME   www1.rr.foo.dom.
24           IN  CNAME   www2.rr.foo.dom.
25           IN  CNAME   www3.rr.foo.dom.
26           IN  CNAME   www4.rr.foo.dom.
27           IN  CNAME   www5.rr.foo.dom.
28           IN  CNAME   www6.rr.foo.dom.
29
30   ;;
31   ;;  the address (A) resource records for the
32   ;;  final NAME -> IP mapping
33   ;;
34   www1    IN  A       192.168.1.1
35   www2    IN  A       192.168.1.2
36   www3    IN  A       192.168.1.3
37   www4    IN  A       192.168.1.4
38   www5    IN  A       192.168.1.5
39   www6    IN  A       192.168.1.6