Create for example a VM machine named mydns and install following:
Need RPMs
[root@mydns ~]# rpm -qa | grep bind
ypbind-1.19-12.el5_6.1
bind-9.3.6-16.P1.el5
bind-utils-9.3.6-16.P1.el5
bind-libs-9.3.6-16.P1.el5
/etc/named.conf
# minimal DNS conf file for RAC 11g
options {
//i Forward any name this DNS can't resolve to my router.
forwarders { 192.168.80.2; };
// Directory where named will look for zone files.
directory "/var/named";
};
# Forward Zone
zone "mydom.com" IN {
type master;
file "mydom.com.zone";
allow-update { none; };
};
# Reverse Zone
zone "80.168.192.in-addr.arpa" IN {
type master;
file "80.168.192.zone";
allow-update { none; };
};
Overview
Server
|
DNS
|
RAC node 1
|
RAC node 2
|
Public Name
|
mydns.mydom.com
|
rac1.mydom.com
|
rac2.mydom.com
|
Private Name
|
-
|
rac1-priv.mydom.com
|
rac2-priv.mydom.com
|
VIP Name
|
-
|
rac1-vip.mydom.com
|
rac2-vip.mydom.com
|
Public IP – eth0
|
192.168.80.140
|
192.168.80.151
|
192.168.80.152
|
VIP IP – eth0:1
|
-
|
192.168.80.171
|
192.168.80.172
|
Private IP – eth1
|
-
|
192.168.136.151
|
192.168.136.152
|
SCAN Adresse
|
FQN
|
Shortname
|
192.168.80.201
|
rac-scan.mydom.com
|
rac-scan
|
192.168.80.202
|
rac-scan.mydom.com
|
rac-scan
|
192.168.80.203
|
rac-scan.mydom.com
|
rac-scan
|
Zone file /etc/named/mydom.com.zone
$ORIGIN mydom.com.
$TTL 1D ; time-to-live - (1 day)
@ IN SOA mydns.mydom. master.mydom.com. (
201011021 ; serial number - (yyyymmdd+s)
1d ; refresh - (1 day)
1h ; retry - (1 hour)
1w ; expire - (1 week)
60 ; minimum - (1 minute)
)
;
@ NS mydns ; mydns.mydom.com is the name server
localhost A 127.0.0.1
; RAC nodes
rac1 A 192.168.80.151
rac2 A 192.168.80.152
rac1-vip A 192.168.80.171
rac2-vip A 192.168.80.172
rac1-priv A 192.168.136.151
rac2-priv A 192.168.136.152
; DNS
mydns A 192.168.80.140
; SCAN - Single Client Access Name
rac-scan A 192.168.80.201
rac-scan A 192.168.80.202
rac-scan A 192.168.80.203
Reverse zone file /etc/named/80.168.192.zone
$ORIGIN 80.168.192.in-addr.arpa.
$TTL 1D ; time-to-live - (1 day)
@ IN SOA mydns.mydom. master.mydom.com. (
201011021 ; serial number - (yyyymmdd+s)
1d ; refresh - (1 day)
1h ; retry - (1 hour)
1w ; expire - (1 week)
60 ; minimum - (1 minute)
)
;
@ NS mydns ; mydns.mydom.com is the name server
; RAC nodes
151 PTR rac1.mydom.com.
152 PTR rac2.mydom.com.
; RAC-VIP nodes
171 PTR rac1-vip.mydom.com.
172 PTR rac1-vip.mydom.com.
; DNS server
40 PTR mydns.mydom.com.
; SCAN - Single Client Access Name
201 PTR rac-scan.mydom.com.
202 PTR rac-scan.mydom.com.
203 PTR rac-scan.mydom.com.
/etc/resolv.conf (in DNS machine)
[root@mydns ~]# cat /etc/resolv.conf
nameserver 127.0.0.1
search mydom.com
Check config file
[root@mydns ~]# named-checkconf /etc/named.conf
[root@mydns ~]# named-checkzone mydom.com /var/named/mydom.com.zone
zone mydom.com/IN: loaded serial 201011021
OK
[root@mydns ~]# named-checkzone 80.168.192.in-addr.arpa /var/named/80.168.192.zone
zone 80.168.192.in-addr.arpa/IN: loaded serial 201011021
OK
[root@mydns ~]#
Run service named
[root@mydns ~]# service named start
Starting named: [ OK ]
[root@mydns ~]#
/etc/resolv.conf (in a RAC Node)
[root@rac1 ~]# cat /etc/resolv.conf
nameserver 192.168.80.140
search mydom.com
[root@rac1 ~]#
Test
[root@rac1 ~]# nslookup rac1
Server: 192.168.80.140
Address: 192.168.80.140#53
Name: rac1.mydom.com
Address: 192.168.80.151
[root@rac1 ~]# nslookup rac1-vip
Server: 192.168.80.140
Address: 192.168.80.140#53
Name: rac1-vip.mydom.com
Address: 192.168.80.171
[root@rac1 ~]# nslookup rac-scan
Server: 192.168.80.140
Address: 192.168.80.140#53
Name: rac-scan.mydom.com
Address: 192.168.80.201
Name: rac-scan.mydom.com
Address: 192.168.80.202
Name: rac-scan.mydom.com
Address: 192.168.80.203
[root@rac1 ~]# nslookup rac-scan
Server: 192.168.80.140
Address: 192.168.80.140#53
Name: rac-scan.mydom.com
Address: 192.168.80.203
Name: rac-scan.mydom.com
Address: 192.168.80.201
Name: rac-scan.mydom.com
Address: 192.168.80.202
Note: nslookup must return 3 IPs in a different order each time
[root@rac1 ~]# dig rac-scan.mydom.com
; <<>> DiG 9.3.6-P1-RedHat-9.3.6-16.P1.el5 <<>> rac-scan.mydom.com
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 10628
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 1, ADDITIONAL: 1
;; QUESTION SECTION:
;rac-scan.mydom.com. IN A
;; ANSWER SECTION:
rac-scan.mydom.com. 86400 IN A 192.168.80.202
rac-scan.mydom.com. 86400 IN A 192.168.80.203
rac-scan.mydom.com. 86400 IN A 192.168.80.201
;; AUTHORITY SECTION:
mydom.com. 86400 IN NS mydns.mydom.com.
;; ADDITIONAL SECTION:
mydns.mydom.com. 86400 IN A 192.168.80.140
;; Query time: 0 msec
;; SERVER: 192.168.80.140#53(192.168.80.140)
;; WHEN: Tue Apr 24 10:56:49 2012
;; MSG SIZE rcvd: 120
[root@rac1 ~]# dig -x 192.168.80.203
; <<>> DiG 9.3.6-P1-RedHat-9.3.6-16.P1.el5 <<>> -x 192.168.80.203
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 56995
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 0
;; QUESTION SECTION:
;203.80.168.192.in-addr.arpa. IN PTR
;; ANSWER SECTION:
203.80.168.192.in-addr.arpa. 86400 IN PTR rac-scan.mydom.com.
;; AUTHORITY SECTION:
80.168.192.in-addr.arpa. 86400 IN NS mydns.80.168.192.in-addr.arpa.
;; Query time: 0 msec
;; SERVER: 192.168.80.140#53(192.168.80.140)
;; WHEN: Tue Apr 24 10:57:14 2012
;; MSG SIZE rcvd: 97
[root@rac1 ~]#
Link:
http://www.oracle.com/technetwork/products/clustering/overview/scan-129069.pdf
