configure DNS for Installtion of Oracle Grid Infrastructure RAC cluster
1.create these files :- forward.zone,reverse.zone and named.rfc1912.zones into /var/named/chroot/var/named
2.content of forward.zone :-
$TTL 86400
@ IN SOA rac. rac. (
42 ; serial (d. adams)
3H ; refresh
15M ; retry
1W ; expiry
1D ) ; minimum
@ IN NS rac.
rac IN A 192.168.72.128
localhost IN A 127.0.0.1
rac2 IN A 192.168.72.129
rac-vip IN A 192.168.72.102
rac2-vip IN A 192.168.72.104
rac-cluster-scan IN A 192.168.72.106
rac-cluster-scan IN A 192.168.72.107
rac-cluster-scan IN A 192.168.72.108
3.content of reverse.zone :-
$TTL 86400
@ IN SOA rac. rac. (
42 ; serial (d. adams)
3H ; refresh
15M ; retry
1W ; expiry
1D ) ; minimum
@ IN NS rac.
128.72.168.192 IN PTR rac.
1.0.0.127 IN PTR localhost.
129.72.168.192 IN PTR rac2.
102.72.168.192 IN PTR rac-vip.
104.72.168.192 IN PTR rac2-vip.
106.72.168.192 IN PTR rac-cluster-scan.
107.72.168.192 IN PTR rac-cluster-scan.
108.72.168.192 IN PTR rac-cluster-scan.
4.content of named.rfc1912.zones :-
zone "rac" IN {
type master;
file "forward.zone";
};
zone "72.168.192.in-addr.arpa" IN {
type master;
file "reverse.zone";
};
5.change the ownership and owner of these files by below command :-
chown named:named *.*
6.create the named.conf into /var/named/chroot/etc
7.content of named.conf :-
options {
listen-on port 53 { 192.168.72.128; };
# listen-on-v6 port 53 { ::1; };
directory "/var/named";
recursion yes;
};
logging {
channel default_debug {
file "data/named.run";
severity dynamic;
};
};
include "named.rfc1912.zones";
8.change the ownership and owner of these files by below command :-
chown named:named *.*
9.config the file /etc/resolv.conf
10.content of /etc/resolv.conf
search rac
nameserver 192.168.72.128
11.change the ownership and owner of these files by below command :-
chown named:named *.*
12. start the named service :-
service named start
chkconfig named on
13.Test the DNS IP reachability :-
nslookup rac
nslookup rac2
nslookup rac-cluster-scan
14. contents of /etc/hosts file :-
cat /etc/hosts
# that require network functionality will fail.
127.0.0.1 localhost.localdomain localhost
::1 localhost6.localdomain6 localhost6
#eth1 - PUBLIC
192.168.72.128 rac
192.168.72.129 rac2
#VIP
192.168.72.102 rac-vip
192.168.72.104 rac2-vip
#eth2 - PRIVATE
192.168.140.128 rac-pvt
192.168.140.129 rac2-pvt
Note :- Make all these changes to all node , by interchanging the node name .
VOILA ----> Now you ready to Oracle Grid Infrastructure Installation ;) Here I am sharing one snap :-
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