Install and configure DNS for Oracle RAC

Environment:

OS: CentOS 6.9

Memory: 512M

HDD: 20G

Install required packages.

yum install bind bind-utils

Modify /etc/named.conf and add modify followings

listen-on port 53 { 127.0.0.1; 192.168.100.53; };

allow-query     { localhost; 192.168.100.0/24; };

forwarders { 192.168.100.1; };

Add following zone configuration at the end of named.conf file.

zone "localdomain." IN {

                type master;

                file "localdomain.zone";

                allow-update { none; };

        };

Create file /var/named/localdomain.zone and add following entries

$TTL 86400

@   IN  SOA     dns.localdomain (

        2018020301  

        3600       

        1800      

        604800   

        86400   

        86400   

)

; Specify our two nameservers

IN NS dns

; Resolve nameserver hostnames to IP, replace with your two droplet IP addresses.

dns IN A 192.168.100.53

rac01 IN A 192.168.100.101

rac02 IN A 192.168.100.102

rac01-priv IN A 192.168.1.101

rac02-priv IN A 192.168.1.102

rac01-vip IN A 192.168.100.201

rac02-vip IN A 192.168.100.202

rac-scan IN A 192.168.100.203

rac-scan IN A 192.168.100.204

rac-scan IN A 192.168.100.205

Start named process to start dns.

/etc/init.d/named restart