Oracle RAC /etc/resolv.conf file Tips

Question:  :  What is the /etc/resolv.conf file and how does /etc/resolv.conf work on a RAC database system?

Answer:  The /etc/resolv.conf file allows the DNS to translate user-friendly domain names into IP addresses.  

The etc/resolv.conf file must be edited on each RAC node.

The /etc/resolv.conf file is used to point the node where the IP address and DNS matches the system-wide DNS server name.   

With RAC, you edit the /etc/resolv.conf file on each RAC node and always make sure the file contains the following entries, where the IP address and domain match those of your DNS server and the domain you have configured.

 nameserver 192.192.1.1
search localdomain  

Here is the format of an /etc/resolv.conf file:

search "same DNS domain name"
domain "same DNS local domain name"
nameserver "IP address of DNS domain name server for first set of servers"
nameserver "IP address of DNS domain name server for second set of servers"
nameserver "IP address of DNS domain name server for third set of servers"
nameserver "IP address of DNS domain name server for nth set of servers"  

Here is an example of an /etc/resolv.conf file:

 cat /etc/resolv.conf

search "192.192.1.1"
domain "diogenes"
nameserver "192.168.14.2"  

Note that you can have up to three nameserver entries in /etc/resolv.conf.

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