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System Administration Guide: Naming and Directory Services (DNS, NIS, and LDAP)

How to Specify a Cache-Only or Stub Server

All servers are caching servers as all servers maintain a cache of DNS data. A caching only or stub server is a server that is not a master server for any zone other than the in-addr.arpa. domain.

A cache-only server does not maintain any authoritative data. The cache-only server handles queries by asking the hosts that are listed in the in.named file for the needed information. In other words, a cache-only server handles queries but does not maintain any authoritative data.

The following is a sample boot file for a cache only server.

Example 4–3 Sample Master Boot File for Caching-only Server


;
; Sample named.boot file for caching-only name server
;
; type                  domain                 source file or host
;
directory /var/named
cache                   .                      named.ca
master                 0.0.127.in-addr.arpa   named.local

You do not need a special line to designate a server as a cache-only server. What denotes a cache-only server is the absence of any slave or master authority lines in the boot file, except as noted below.

A cache-only server requires the following.