Hi,
Here I have given easy step by step DNS configuration methods in Linux, I hope this will useful for you also.
1. First change or assign a host Name to your server; in this example my host Name is server.anand.com and my IP address is 192.168.50.196.
files /etc/hosts , /etc/sysconfig/network.
2. Download or Install following RPMS from CD/DVD of Linux OS.
RPMS :-
bind-utils-9.3.4-10.P1.el5
bind-sdb-9.3.4-10.P1.el5
bind-libs-9.3.4-10.P1.el5
bind-9.3.4-10.P1.el5
system-config-bind-4.0.3-4.el5.centos
bind-chroot-9.3.4-10.P1.el5
bind-libbind-devel-9.3.4-10.P1.el5
bind-devel-9.3.4-10.P1.el5
caching-nameserver-9.3.4-10.P1.el5
3. My DNS server IP address is 192.168.50.196
# cd /var/named/chroot/etc
copy file named.caching-nameserver.conf to named.conf
# cp named.caching-nameserver.conf named.conf
Make the following changes (It's require).
options {
listen-on port 53 { 127.0.0.1; 192.168.50.196; };
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";
query-source port 53;
query-source-v6 port 53;
allow-query { 127.0.0.1; 192.168.50.0/24; };
allow-transfer { 127.0.0.1; 192.168.50.196; };
forwarders { 127.0.0.1; 192.168.50.196; };
forward only;
};
logging {
channel default_debug {
file "data/named.run";
severity dynamic;
};
};
view localhost_resolver {
match-clients { localhost; 192.168.50.0/24; };
match-destinations { localhost; 192.168.50.0/24; };
recursion yes;
include "/etc/named.rfc1912.zones";
};
Save this file and exit
4. Save this file and exit
copy named.conf file to /etc directory.
# cp /var/named/chroot/etc/named.conf /etc/
5. # cd /etc
6. Open /etc/named.rfc1912.zones
zone "anand.com" IN {
type master;
file "anand.zone";
allow-update { none; };
allow-query { any; };
};
zone "50.168.192.in-addr.arpa" IN {
type master;
file "anand.local";
allow-update { none; };
allow-query { any; };
};
7. cd /var/named/chroot/var/named
8. cp localhost.zone anand.zone
9. cp named.local anand.local
10. Edit anand.zone and make the following changes.
$TTL 86400
@ IN SOA server.anand.com. root.server.anand.com. (
42 ; serial (d. adams)
3H ; refresh
15M ; retry
1W ; expiry
1D ) ; minimum
@ IN NS server.anand.com.
server.anand.com. IN A 192.168.50.196
ldaplinux.anand.com. IN A 192.168.50.115 # Client
myclient-no1 IN A 192.168.50.141 # Client
www IN CNAME server.anand.com.
ftp IN CNAME server.anand.com.
Save this file and exit
11. Edit anand.local and make the following changes
$TTL 86400
@ IN SOA server.anand.com. root.server.anand.com. (
1997022700 ; Serial
28800 ; Refresh
14400 ; Retry
3600000 ; Expire
86400 ) ; Minimum
@ IN NS server.anand.com.
196 IN PTR server.anand.com.
115 IN PTR ldaplinux.anand.com. # Client
141 IN PTR myclient-no1. # Client
Save this file and exit.
12. chown root:named anand.zone Permission 775
13. chown root:named anand.local Permission 775
14. chown root:named /var/named/chroot/etc/named.conf permission 775
15. chown root:named /etc/named.conf permission 775
16. chown root:named /etc/named.rfc1912.zones permission 775 This file link with /var/named/chroot/etc/named.rfc1912.zones
On Final DNS server.
# service named start
# chkconfig named on
To check DNS configuration is correct or wrong use following command.
# dig anand.com or dig -x 192.168.50.196
Here I am using dig -x 192.168.50.196
dig -x 192.168.50.196
; <<>> DiG 9.3.4-P1 <<>> -x 192.168.50.196
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 29928
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 1
;; QUESTION SECTION:
;196.50.168.192.in-addr.arpa. IN PTR
;; ANSWER SECTION:
196.50.168.192.in-addr.arpa. 86400 IN PTR server.anand.com.
;; AUTHORITY SECTION:
50.168.192.in-addr.arpa. 86400 IN NS server.anand.com.
;; ADDITIONAL SECTION:
server.anand.com. 86400 IN A 192.168.50.196
;; Query time: 11 msec
;; SERVER: 192.168.50.196#53(192.168.50.196)
;; WHEN: Sat Jan 9 20:29:30 2010
;; MSG SIZE rcvd: 105
QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 1
All the four sections means Query: 1, Answer: 1, Authority: 1, Additional: 1 .
If it is 0 then you have to check all steps again properly.
Client Configuration:-
1.
Edit file /etc/resolv.conf
2.
make the following changes
search anand.com
nameserver 192.168.50.196 # DNS server IP Address
I hope these all steps will help you to configure DNS.
Anand Mane.
