Oracle RAC /etc/named.conf file tips

Question:  What does the /etc/named.conf file do in a RAC system?

Answer:  One of the options sections of etc/named/conf tells the DNS names server that any unresolved IP request should use one of the DNA entries listed in /etc/resolv/conf:

 options (forwarders { 192.192.1.1; });

If you are using a RAC client to connect to the RAC node, you would create a zone in your /etc/named/conf file as follows:

 zone "my_dnsname1" IN {
         type master;
         file "my_dnsname1.zone";
         allow-update { none; };
};  

If your server uses the localdomain option, then you don’t need to define a zone in your /etc/named/conf file:

 zone "localdomain." IN {
         type master;
         file "localdomain.zone";
         allow-update { none; };
};

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