Configure caching-only Server

 

Caching server gets its information from another server ( Master DNS server ) in response to a host query and then cache this information locally, it saves cached data until the time period "time-to-live" in named.conf file expire. When a caching only DNS server starts for the first time, it has't cached informaton , the caching only DNS server collects information as it send and recive quires. 

Caching only Characteristic
1- A caching-only server is not authoritative for any domain.
2- Caching-only DNS servers do not host zones.
3- caching-only DNS servers are excluded from the zone transfer process, and therefore do not generate network traffic from zone transfers.

Configure Caching only DNS server

before configure Caching-only DNS server yu have to configure Master DNS server Follow this link to learn how to :-

Configure DNS server on oracle solaris 10

the files that are needed to start Caching-only DNS server are :-

1- named.conf

2- root server file

➊ make sure your DNS daemon is disabled.

 svcadm disable dns/server  

➋ create the DNS confiuration file "named.conf"

 touch /etc/named.conf 

➌ edit the "named.conf" file

 vi /etc/named.conf 

The file will be opened for editing , if you don't know how to use VI editor follow this link to be more familiar with VI Editor:- UNIX VI editor

➍ add the following lines to the "named.conf" file.

options {  
         "/var/named";  
 }; 

zone "." {  
       type hint;  
       file "db.cache";  
 };

➎ create db.cache 

 mkdir /var/named 

 cd /var/named 

↪ Download root servers file

 /usr/sfw/bin/wget ftp://ftp.rs.internic.net/domain/named.root 

↪ rename named.root to db.cache

 mv named.root db.cache 

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