We will use Perl script called “h2n” that creates the appropriate files for a DNS server.
Download h2n Scripts---Click Here
Step 1:- Edit /etc/hosts file
The new domain server will be on system 192.168.137.25 which is called SCAN.
The following /etc/host file has been edit to contain all the DNS entries that are required:
192.168.137.25 scan.indiandba.com scan
Assume domain name is to be indiandba.com
Assume network is 192.168.137
Create a domain run directory to contain the Named services files called /var/named.
Step 2:- Create named directory and copy h2n script
$ mkdir -p /var/named
$ cp <from the ./h2n-2.56 directory>/h2n /var/named
Step 3:- Run the h2n script file as follows:
$cd /var/named
$./h2n -d indiandba.com -n 192.168.137 -u oracle@indinadba.com
Step 4:- Download “named.root” file, rename the file to db.cache and copy to the /var/named directory.
Step 5:- Copy named.conf file to /etc directory
$ cp /var/named/named.conf /etc
Step 6:- Edit the file /etc/nsswitch.conf and add the entry dns to the host entry as follows:
====================================================================
#
# /etc/nsswitch.files:
#
# An example file that could be copied over to /etc/nsswitch.conf; it
# does not use any naming service.
#
# "hosts:" and "services:" in this file are used only if the
# /etc/netconfig file has a "-" for nametoaddr_libs of "inet" transports.
passwd: files
group: files
hosts: files dns
networks: files
protocols: files
: : : : : :
: : : : : :
=====================================================================
Step 7:- Create or edit a file called /etc/defaultdomain and add the single entry:
$vi /etc/defaultdomain
indiandba.com
Step 8:- Execute the domainname command to set the domain as follows:
$domainname ‘cat /etc/defaultdomain’
Step 9:- Edit /etc/resolv.conf file
$vi /etc/resolv.conf
domain indiandba.com
nameserver 192.168.137.25
Step 10:- Start Named Services
$/usr/sbin/in.named &
Step 11:- To enabled the respository use
$svcs -a | grep dns
disabled 10:15:21 svc:/network/dns/server:default
disabled 10:15:22 svc:/network/dns/client:default
$svcadm enable /network/dns/server
$svcs -a | grep dns
online 10:15:21 svc:/network/dns/server:default
online 10:15:22 svc:/network/dns/client:default
Note:---- /network/dns/server must be online for DNS to run properly and initiate if the DNS server is rebooted.
Step 12:- Configurating Clients to use DNS To use DNS, clients need to modify the /etc/resolv.conf, and /etc/nsswitch.conf as above. The /etc/defaultdomain file must also be created and establsihed as above.
Reference: -
http://www.logiqwest.com/dataCenter/Demos/RunBooks/DNS/DNSsetup.html
