Configuring Alternate DNS Server

Although this name server receives its namespace information from a master

Name server, this Name server type can answer queries for which it has authority. Used for load balancing and redundancy.

Prerequisite for Alternate DNS Server (SDNS)

Ø  Yum process.

Ø  IP setting with PDNS Address.

Ø  Hostname set.

Ø  IP tables Flash.

Ø  Hosts profile update and PDNS Profile entry.

Ø  Primary DNS servers host files - SDNS Profiles entry.

Ø  Primary DNS server’s resolv.conf files - SDNS IP entry.

Ø  Checking PDNS with ping domain name

Setting up BIND

Step-1.1:  Install the required packages for BIND:

               # yum □ install □ bind*

 Step-1.2:   Verify that packages have been installed.

              # rpm □ –qa □ bind*

Setting up CACHING

Step-2.1:  Install the required package for CACHING.

                # yum □ install □ caching*

Step-2.2:   Verify that packages have been installed.

                # rpm □ -qa □ caching*

Note:  There are also a handful of configure files:

/etc/resolv.conf

            [ This file contain resolve information ]

/etc/named.caching-nameserver.conf

            [This file contain name server caching information]

/etc/named.rfc1912.zones

[This file contain forward lookup zone and reveres lookup zone files.]

Step-3: Edit resolv.conf file for set name space and name server IP.

            # vi □ /etc/resolv.conf

 

Step-4:  Edit named.rfc1912.zones file for declare Zone file and Domain name.

# vi □ /etc/named.rfc1912.zones

 

 Step-5:   Open named.caching-nameserver.conf file for declare Access Control List (ACL).

            # vi □ /etc/named.caching-nameserver.conf

 

Step-6: Enable the service to start during boot:

               # chkconfig □ named □ on

                                    Or

               # ntsysv

Step-7: Restart named service for DNS with Firewall and SELinux.

# service □ network □ restart

            # service □ portmap □ restart

            # iptables □ –F

            # service □ iptables □ save

            # service □ named □ restart

Step-8: Verify that the Alternate Name Server…

             # ls □ /var/named/chroot/var/named/slaves 

[If SDNS is okay then two new file the slave’s directory]

           

# dig □ -x □ 192.168.1.200                                                                 [ SDNS IP Address]

            # dig □ sandwip.com                                                                         [Domain name]

            # host □ sandwip.com                                                                       [Domain name]

            # ping □ sandwip.com

[The End Alternate Domain Name Server Configure]