Change is the end result of all true learning

Cent OS 8 / RHEL

DNS Server

Part - 1

Step 1 : Check Your Hostname.

# hostnamectl

Here lan10.linoxcloud.com Is My Static Hostname / OS Hostname

Step 2 : How To Change Your Hostname

Here Instead Oflan10.linoxcloud.com You Can Give server.example.com

Step 3: Install Bind Server

# yum install bind bind-utils

Step 4: Configure Your Firewall Allow ->> DNS To Communicate Through Firewall

firewall-cmd --permanent --add-port=53/udp

firewall-cmd --permanent --add-port=53/tcp

firewall-cmd --reload

firewall-cmd --list-all

Congratulations! You have made it!

Part - 2 Lets's Do Config

Step 1 : Go To named.conf File Location

# cd /etc
# vim named.conf

Let Me Explain Above Picture –>

Here Give Your Local DHCP IP Address Ex.192.168.x.x or 172.16.x.x or 10.x.x.x
_________________________________________________________________________________________

Here You Have To Allow Domain Names TO Communicate Through a Device To Any Host Or Perticular IP Address (Public / Private(DHCP))

__________________________________________________________________________________

Create Primary Master DNS Zone File :

__________________________________________________________________________________
Create Slave Master DNS Zone File:

Here IF Your IP Address Is 192.168.1.10 ->> Reverse The IP Address By Removing Last Octet(ex.10)
–> 1.168.192.in-addr.arpa
________________________________________________________________________________________

Lets Create pdns.linoxcloud.com & sdns.linoxcloud.com

Part - 3 Master, Slave DNS Config

# cd /var/named

# cp named.localhost pdns.linoxcloud.com

Here –> SOA is Start Of Authority, lan10.linoxcloud.com Is hostname
hostname has To end With . -> Deli Meter
lan10,mail,login,etc., Are CNAMES For The linoxcloud.com
Here –> IN Stands For Internet

–> A is IPV4 Address / AAAA is IPV6 Address
–> NS is Name server / Hostname Ends With . (Must)

# cp pdns.linoxcloud.com sdns.linoxcloud.com

# vim sdns.linoxcloud.com

–> PTR Pointer Record For a Domain
–> 10,11 are Last Octet Values Assign To PTR Address ->> lan10.linoxcloud.com / CNAME client.linoxcloud.com

Checking

Step 1 : Check named.conf File Configuration is Correct Or Not?

# named-checkconf -z /etc/named.conf

Step 2 : Check PDNS & SDNS Configuration!

# named-checkzone forward /var/named/pdns.linoxcloud.com

# named-checkzone forward /var/named/pdns.linoxcloud.com

# systemctl restart named

Pictures :
Check named.conf File

Success Hurrah!!
Check pdns.linoxcloud.com

Check sdns.linoxcloud.com

Restart named Service

Congratulations! You have made it!

Working Procedure :
Step 1 : Open Your Router Virtual Routing Settings:

–> Allow DNS 53 Port Both TCP / UDP / ALL