Secondary DNS Server Configuration
Change in Primary DNS Server:
Step-1: Edit the named.conf file for Secondary DNS .
[root@ns1 ~]# vi /etc/named.conf
Original File:
// named.rfc1912.zones:
//
// Provided by Red Hat caching-nameserver package
//
// ISC BIND named zone configuration for zones recommended by
// RFC 1912 section 4.1 : localhost TLDs and address zones
//
// See /usr/share/doc/bind*/sample/ for example named configuration files.
//
options {
directory "/var/named";
};
zone "." IN {
type hint;
file "named.ca";
};
zone "localdomain" IN {
type master;
file "localdomain.zone";
allow-update { none; };
};
zone "localhost" IN {
type master;
file "localhost.zone";
allow-update { none; };
};
zone "0.0.127.in-addr.arpa" IN {
type master;
file "named.local";
allow-update { none; };
};
zone "0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.ip6.arpa" IN {
type master;
file "named.ip6.local";
allow-update { none; };
};
zone "255.in-addr.arpa" IN {
type master;
file "named.broadcast";
allow-update { none; };
};
zone "0.in-addr.arpa" IN {
type master;
file "named.zero";
allow-update { none; };
};
zone "alphabd.net" IN {
type master;
file "alphabd.fz";
};
zone "201.207.210.in-addr.arpa" IN {
type master;
file "alphabd.rz";
};
Modified File:
// named.rfc1912.zones:
//
// Provided by Red Hat caching-nameserver package
//
// ISC BIND named zone configuration for zones recommended by
// RFC 1912 section 4.1 : localhost TLDs and address zones
//
// See /usr/share/doc/bind*/sample/ for example named configuration files.
//
options {
directory "/var/named";
};
zone "." IN {
type hint;
file "named.ca";
};
zone "localdomain" IN {
type master;
file "localdomain.zone";
allow-update { none; };
};
zone "localhost" IN {
type master;
file "localhost.zone";
allow-update { none; };
};
zone "0.0.127.in-addr.arpa" IN {
type master;
file "named.local";
allow-update { none; };
};
zone "0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.ip6.arpa" IN {
type master;
file "named.ip6.local";
allow-update { none; };
};
zone "255.in-addr.arpa" IN {
type master;
file "named.broadcast";
allow-update { none; };
};
zone "0.in-addr.arpa" IN {
type master;
file "named.zero";
allow-update { none; };
};
zone "alphabd.net" IN {
type master;
file "alphabd.fz";
allow-update { 210.207.201.2; }; 1st Change};
zone "201.207.210.in-addr.arpa" IN {
type master;
file "alphabd.rz";
allow-update { 210.207.201.2; }; 2nd Change};
Step-2: Edit Forward Lookup zone file for Secondary DNS server record
[root@ns1 ~]# cd /var/named/chroot/var/named/
[root@ns1 named]# vi alphabd.fz
Original File: alphabd.fz
$TTL 86400
@ IN SOA ns1.alphabd.net. root.alphabd.net. (
2011022500 ; serial (d. adams)
3H ; refresh
15M ; retry
1W ; expiry
1D ) ; minimum
IN NS ns1.alphabd.net.
ns1 IN A 210.207.201.1
Modified File: alphabd.fz
$TTL 86400
@ IN SOA ns1.alphabd.net. root.alphabd.net. (
2011022500 ; serial (d. adams)
3H ; refresh
15M ; retry
1W ; expiry
1D ) ; minimum
IN NS ns1.alphabd.net.
IN NS ns2.alphabd.net.
ns1 IN A 210.207.201.1
ns2 IN A 210.207.201.2
www IN CNAME ns1.alphabd.net.
Step-3: Edit Reverse Lookup zone file for Secondary DNS server record
[root@ns1 named]# vi alphabd.rz
Original File: alphabd.rz
$TTL 86400
@ IN SOA ns1.alphabd.net. root.alphabd.net. (
2011022500 ; serial (d. adams)
3H ; refresh
15M ; retry
1W ; expiry
1D ) ; minimum
IN NS ns1.alphabd.net.
1 IN PTR ns1.alphabd.net.
Modified File: alphabd.rz
$TTL 86400
@ IN SOA ns1.alphabd.net. root.alphabd.net. (
2011022500 ; serial (d. adams)
3H ; refresh
15M ; retry
1W ; expiry
1D ) ; minimum
IN NS ns1.alphabd.net.
IN NS ns2.alphabd.net.
1 IN PTR ns1.alphabd.net.
2 IN PTR ns2.alphabd.net.
Step-4: Check the named.conf & zone file by following this commands,
[root@ns1 ~]# named-checkconf /var/named/chroot/etc/named.conf
[root@ns1 ~]# named-checkzone alphabd.net /var/named/chroot/var/named/
alphabd.fz
[root@ns1 ~]# named-checkzone alphabd.rz /var/named/chroot/var/named/
alphabd.rz
Step-5: Edit the resolv.conf file by following this command
[root@ns1 named]# vi /etc/resolv.conf
search alphabd.net
nameserver 210.207.201.1
nameserver 210.207.201.2
Step-6: Start & stop all the required services.
[root@ns1 ~]# service iptables stop
[root@ns1 ~]# service network restart
[root@ns1 ~]# chkconfig named on
[root@ns1 ~]# service named restart
Change In Secondary DNS Server:
Step-1: To check bind and caching-nameserver rpm package is installed or not by following this command:
(if installed then it will show bind packages)
[root@ns2 ~]# rpm -qa | grep –i bind* or
[root@ns2 ~]# rpm –qa bind*
bind-chroot-9.3.6-4.P1.el5
bind-libs-9.3.6-4.P1.el5
ypbind-1.19-12.el5
bind-9.3.6-4.P1.el5
bind-utils-9.3.6-4.P1.el5
bind-sdb-9.3.6-4.P1.el5
bind-devel-9.3.6-4.P1.el5
bind-libbind-devel-9.3.6-4.P1.el5
system-config-bind-4.0.3-4.el5
[root@ns2 ~]# rpm -qa caching-nameserver*
Caching-nameserver-9.3.6-4.P1.el5
If not installed, then installed the packages using Yum command:
[root@ns2 ~]# Yum Install bind* caching-nameserver*
Step-2: Check and Configure the Network Card:
[root@ns2 ~]# vi /etc/sysconfig/network-scripts/ifcfg-eth0
(Original File):
#Broadcom Corporation Net link BCM57875 Gigabyte Ethernet PCI Express
DEVICE=eth0
BOOTPROTO=dhcp
HWADDR=00:0C:29: EB: B2: CA
ONBOOT=yes
BOOTPROTO=dhcp
HWADDR=00:0C:29: EB: B2: CA
ONBOOT=yes
(Modified File):
#Broadcom Corporation Net link BCM57875 Gigabyte Ethernet PCI Express
DEVICE=eth0
BOOTPROTO=static
HWADDR=00:0C:29: EB: B2: CA
ONBOOT=yes
TYPE=Ethernet
PEERDNS=no
USERCTL=no
IPV6INIT=no
IPADDR=210.207.201.2
NETMASK=255.255.255.0
NETWORK=210.207.201.0
BROADCAST=210.207.201.255
After changing you have to reload/restart the NIC(eth0) card by following command:
[root@ns2 ~]# ifdown eth0
[root@ns2 ~]# ifup eth0
[root@ns2 ~]# service network restart
Step-3: After complete the NIC configure you have to change the host name by following this command:
[root@ns2 ~]# vi /etc/sysconfig/network
(Original File):
NETWORKING=yes
NETWORKING_IPV6=no
HOSTNAME=localhost.localdomain
(Modified File):
NETWORKING=yes
NETWORKING_IPV6=no
HOSTNAME=ns2
Step-4: Now Edit hosts file for host name resolution by following this command:
[root@ns2 ~]# vi /etc/hosts
(Original File):
# Do not remove the following line, or various programs
# that require network functionality will fail.
127.0.0.1 localhost.localdomain localhost
(Modified File):
# Do not remove the following line, or various programs
# that require network functionality will fail.
127.0.0.1 localhost.localdomain localhost
210.207.201.1 ns1.alphabd.net ns1
210.207.201.2 ns2.alphabd.net ns2
Step-5: Copy & Rename the named.rfc1912.zones file to named.conf file & Change the ownership & permission by following this command:
[root@ns2 ~]# cd /var/named/chroot/etc/
[root@ns2 etc]# cp named.rfc1912.zones named.conf
[root@ns2 etc]# chown root:named named.conf
[root@ns2 etc]# chmod 777 named.conf
Now Create A Link into /etc directory of named.conf then edit.
[root@ns2 etc]# ln –s /var/named/chroot/etc/named.conf /etc/named.conf
[root@ns2 ~]# vi /etc/named.conf
Original File:
// named.rfc1912.zones:
//
// Provided by Red Hat caching-nameserver package
//
// ISC BIND named zone configuration for zones recommended by
// RFC 1912 section 4.1 : localhost TLDs and address zones
//
// See /usr/share/doc/bind*/sample/ for example named configuration files.
//
zone "." IN {
type hint;
file "named.ca";
};
zone "localdomain" IN {
type master;
file "localdomain.zone";
allow-update { none; };
};
zone "localhost" IN {
type master;
file "localhost.zone";
allow-update { none; };
};
zone "0.0.127.in-addr.arpa" IN {
type master;
file "named.local";
allow-update { none; };
};
zone "0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.ip6.arpa" IN {
type master;
file "named.ip6.local";
allow-update { none; };
};
zone "255.in-addr.arpa" IN {
type master;
file "named.broadcast";
allow-update { none; };
};
zone "0.in-addr.arpa" IN {
type master;
file "named.zero";
allow-update { none; };
};
Modified File:
// named.rfc1912.zones:
//
// Provided by Red Hat caching-nameserver package
//
// ISC BIND named zone configuration for zones recommended by
// RFC 1912 section 4.1 : localhost TLDs and address zones
//
// See /usr/share/doc/bind*/sample/ for example named configuration files.
//
options {
directory "/var/named";
};
zone "." IN {
type hint;
file "named.ca";
};
zone "localdomain" IN {
type master;
file "localdomain.zone";
allow-update { none; };
};
zone "localhost" IN {
type master;
file "localhost.zone";
allow-update { none; };
zone "0.0.127.in-addr.arpa" IN {
type master;
file "named.local";
allow-update { none; };
};
zone "0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.ip6.arpa" IN {
type master;
file "named.ip6.local";
allow-update { none; };
};
zone "255.in-addr.arpa" IN {
type master;
file "named.broadcast";
allow-update { none; };
};
zone "0.in-addr.arpa" IN {
type master;
file "named.zero";
allow-update { none; };
};
zone "alphabd.net" IN {
type slave;
file "alphabd.fz";
masters { 210.207.201.1; };
};
zone "201.207.210.in-addr.arpa" IN {
type slave;
file "alphabd.rz";
masters { 210.207.201.1; };
};
Step-6: Now change the ownership & permission of named directory
[root@ns2 ~]# chown root:named /var/named/chroot/var/named/
[root@ns2 named]# chmod 777 /var/named/chroot/var/named/
Step-7: Edit the resolv.conf file by following this command
[root@ns2 named]# vi /etc/resolv.conf
search alphabd.net
nameserver 210.207.201.1
nameserver 210.207.201.2
Step-8: Start the named service, that it will automatically copy the forward & reverse lookup zone file from Primary DNS server.
[root@ns2 ~]# service iptables stop
[root@ns2 ~]# service network restart
[root@ns2 ~]# chkconfig named on
[root@ns2 ~]# service named restart
Step-9: Check the DNS server by following this command. Also check the Primary DNS from secondary DNS.
[root@ns2 ~]# host 210.207.201.2
[root@ns2 ~]# host ns2.alphabd.net
[root@ns2 ~]# Ping ns2.alphabd.net
[root@ns2 ~]# nslookup ns2.alphabd.net
[root@ns2 ~]# nslookup 210.207.201.2
[root@ns2 ~]# dig ns2.alphabd.net
[root@ns2 ~]# dig –x 210.207.201.2
[root@ns2 ~]# dig –x ns2.alphabd.net
[root@ns2 ~]# dig –t SOA alphabd.net
[root@ns2 ~]# dig –t axfr alphabd.net
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