DNS Configuration for Oracle RAC on VirtualBox

Wondering how to setup DNS server which can be used for oracle RAC in your virtual box environment. Do not worry I will provide the steps on how to setup DNS.

In my case the setup was done on redhat linux

IP Address of DNS Server: 192.168.56.150
DNS Server name: dns1.localdomain
Domain Name: localdomain
Public Network for RAC: 192.168.56
Private Network for RAC: 192.168.1



Steps:
1. Install bind using yum
2. start named service
3. backup original confs if there are any
4. modify or create /etc/named.conf
5. Modify or create /var/named/56.168.192.in-addr.arpa
6. Modify or create zone /var/named/localdomain.zone
7. modify hosts file /etc/hosts
8. Restart named service

1. Install bind using yum

yum -y install bind-libs bind bind-utils

2. start named service 

service named start
chkconfig named on

3. backup original confs if there are any

cp -p /etc/named.conf  /etc/named.conf.original
cp -p /var/named/56.168.192.in-addr.arpa  /var/named/56.168.192.in-addr.arpa.original
cp -p  /var/named/localdomain.zone /var/named/localdomain.zone.original

4. modify or create /etc/named.conf

[root@dns1 ~]# cat /etc/named.conf
//
// named.conf
//
// Provided by Red Hat bind package to configure the ISC BIND named(8) DNS
// server as a caching only nameserver (as a localhost DNS resolver only).
//
// See /usr/share/doc/bind*/sample/ for example named configuration files.
//
options {
        listen-on port 53 { 127.0.0.1;192.168.56.150; };
        listen-on-v6 port 53 { ::1; };
        directory       "/var/named";
        dump-file       "/var/named/data/cache_dump.db";
        statistics-file "/var/named/data/named_stats.txt";
        memstatistics-file "/var/named/data/named_mem_stats.txt";
        allow-query     { any; };
        recursion yes;
        dnssec-enable yes;
        dnssec-validation yes;
        dnssec-lookaside auto;
        /* Path to ISC DLV key */
        bindkeys-file "/etc/named.iscdlv.key";
        managed-keys-directory "/var/named/dynamic";
};
logging {
        channel default_debug {
                file "data/named.run";
                severity dynamic;
        };
};
zone "." IN {
        type hint;
        file "named.ca";
};
zone "localdomain." IN {
        type master;
        file "localdomain.zone";
        allow-update { none; };
};
zone "56.168.192.in-addr.arpa." IN {
        type master;
        file "56.168.192.in-addr.arpa";
        allow-update { none; };
};

include "/etc/named.rfc1912.zones";
include "/etc/named.root.key";
[root@dns1 ~]# 

5. Modify or create /var/named/56.168.192.in-addr.arpa

[root@dns1 ~]# cat /var/named/56.168.192.in-addr.arpa
$ORIGIN 56.168.192.in-addr.arpa.
$TTL 1H
@       IN      SOA     dns1.localdomain.     root.dns1.localdomain. (      2
                                                3H
                                                1H
                                                1W
                                                1H )
56.168.192.in-addr.arpa.         IN NS      dns1.localdomain.
101     IN PTR  rac1.localdomain.
102     IN PTR  rac2.localdomain.
103     IN PTR  rac1-vip.localdomain.
104     IN PTR  rac2-vip.localdomain.
105     IN PTR  scan.localdomain.
106     IN PTR  scan.localdomain.
107     IN PTR  scan.localdomain.
120     IN PTR  host01.localdomain.
135     IN PTR  vhost1.localdomain.
100     IN PTR  rcat1.localdomain.
111     IN PTR  racdr1.localdomain.
113     IN PTR  racdr1-vip.localdomain.
115     IN PTR  scandr.localdomain.
116     IN PTR  scandr.localdomain.
117     IN PTR  scandr.localdomain.
[root@dns1 ~]# 

6. Modify or create zone /var/named/localdomain.zone

[root@dns1 ~]# cat /var/named/localdomain.zone
$TTL    86400
@               IN SOA  localhost root.localhost (
                                        42              ; serial (d. adams)
                                        3H              ; refresh
                                        15M             ; retry
                                        1W              ; expiry
                                        1D )            ; minimum
                IN NS           localhost
localhost       IN A            127.0.0.1
rac1            IN A    192.168.56.101
rac2            IN A    192.168.56.102
rac1-priv       IN A    192.168.1.101
rac2-priv       IN A    192.168.1.102
rac1-vip        IN A    192.168.56.103
rac2-vip        IN A    192.168.56.104
scan        IN A    192.168.56.105
scan        IN A    192.168.56.106
scan        IN A    192.168.56.107
host01      IN A    192.168.56.120
vhost1      IN A    192.168.56.135
rcat1       IN A    192.168.56.100
racdr1            IN A    192.168.56.111
racdr1-priv       IN A    192.168.1.111
racdr1-vip        IN A    192.168.56.113
scandr        IN A    192.168.56.115
scandr        IN A    192.168.56.116
scandr        IN A    192.168.56.117
[root@dns1 ~]# 

7. modify hosts file /etc/hosts

[root@dns1 ~]# cat /etc/hosts
127.0.0.1   localhost.localdomain localhost
192.168.56.150 dns1.localdomain dns1
# Public
192.168.56.101    rac1.localdomain         rac1
192.168.56.102    rac2.localdomain         rac2
# Private
192.168.1.101    rac1-priv.localdomain    rac1-priv
192.168.1.102    rac2-priv.localdomain    rac2-priv
# Virtual
192.168.56.103    rac1-vip.localdomain     rac1-vip
192.168.56.104    rac2-vip.localdomain     rac2-vip
# SCAN
192.168.56.105    scan.localdomain  scan
192.168.56.106    scan.localdomain  scan
192.168.56.107    scan.localdomain  scan


192.168.56.120    host01.localdomain  host01
192.168.56.100    rcat1.localdomain   rcat1
#DR
# Public
192.168.56.111    racdr1.localdomain         racdr1
# Private
192.168.1.111    racdr1-priv.localdomain    racdr1-priv
# Virtual
192.168.56.113    racdr1-vip.localdomain     racdr1-vip
# SCAN
192.168.56.115    scandr.localdomain  scandr
192.168.56.116    scandr.localdomain  scandr
192.168.56.117    scandr.localdomain  scandr
[root@dns1 ~]# 

8. Restart named service

service named restart

And you are done your dns is up and running now.