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Mastering BIND DNS

Name: Mastering BIND DNS
Rating: 4.3 (288 reviews)

How to configure Master DNS, Slave DNS, Round Robin, Split View, Virtual Hosting, DNS for Postfix in professional way

Created byVipin Gupta

Last updated 5/2026

English

What you'll learn

DNS Introduction, DNS Lab Setup Details, Implement Master DNS Server, What are Resource Records (RR), What is Start of Authority (SOA) Type Record
NS, MX, CNAME, A, PTR Types Record, What are Zone Files, Types of DNS Queries, How Iterative Query Works, How Recursive Query Works, Hybrid Query
Implement Slave DNS Server, How Communications between Master and Slave DNS Happens, How To Test DNS Server, Round Robin DNS, Split Namespace
Using nslookup, host and dig, Name Based/IP Based Virtual Hosting, Combine Postfix Mail Server (SMTP), Dovecot (POP, IMAP), SquirrelMail (Web Access) and DNS

Course content

10 sections • 114 lectures • 7h 57m total length

How to get the best out of this course0:41
Implementing Domain Name System (DNS) is one of the most difficult task. As a prerequisite for mastering DNS, you need proper lab setup and thorough understanding of theoretical concepts about DNS. In Section 1, we are covering how to setup DNS Lab. Section 2 will deal with various DNS theoretical concepts. In Later sections, practical implementation details are covered.
DNS Lab Setup Introduction5:47
How to setup the Domain Name System (DNS) Lab.
Prepare System For Configuring Master DNS14:17
Prepare a master dns lab by provisioning centos 7 vms, cloning dns-master, dns-slave, dns-client, setting hostnames, disabling firewall and selinux, and installing bind and utilities with a static 172.24.0.1.
Prepare System For Configuring Slave DNS7:09
Set the hostname to slave.example.com, disable selinux and firewall, configure a static ip 172.24.0.41 with 255.255.0.0, switch from nat to bridge, update the hosts file, and install bind, bind-utils, and httpd, then test connectivity.
Prepare Client System For Testing DNS5:51
Verify Master System5:03
Verify Slave System3:08
Verify Client System3:10

What is DNS?4:55
DNS is used for name resolution. What do you mean by forward resolution and reverse resolution.
Top Level Domains2:12
What do you mean by TLDs (Top Level Domains).
Domain Structure3:00
What do you mean by domain structure.
DNS Namespace0:50
What are 3 different categories under DNS Namespace.
DNS Server Types3:36
What are different types of name servers. What is the purpose of master, slave and caching only servers.
Types of Queries. What is Iterative Query?4:32
What are different types of queries. How iterative query works.
Recursive Query2:41
How recursive query works.
Hybrid Query1:27
How hybrid query works.

Configure Master DNS Server4:19
How to configure master DNS server.
Configure Master DNS Server Demo1:46
Original named.conf File2:48
Other Important Files3:04
Explore key BIND DNS files, such as named.rfc1912.zones and named.ca, view zones like localhost and loopback, and learn A and AAAA records, IPv4 and IPv6 addresses for root servers.
Important Files Demo5:25
Edit named.conf File9:17
What is ACL4:52
Edit named.conf File Demo7:32
Different Global Options7:48
Explore the global options in BIND DNS, including allow-query, allow-transfer, directory and rootdir behavior, forwarders and forward only, allow-recursion, listen-on, and blackhole.
Create Zone Files - 15:05
Create Zone Files - 1 Demo2:34
Copy named.localhost to the forward file in the master DNS, then create, edit, and copy the zone file as reverse, while navigating /var/named and chroot considerations.
Resource Records6:56
What is SOA (Start of Authority) Type6:56
What are NS, MX, A, CNAME, PTR Types6:25
Create Forward Zone File3:12
Create Reverse Zone File3:14
How DNS Query Works?2:21
Learn how a DNS query works: a client asks for www.example.com, the server reads named.conf to locate example.com and uses the forward file to reach the master A record 172.24.0.1.
Create Forward Zone File Demo4:27
Create Reverse Zone File Demo3:01
Create the reverse zone by copying forward, editing with vi, setting master.example.com dot and a PTR record, save, then use ls -l and chgrp named to ensure proper ownership.
Start Master DNS Server2:03
Configure Resolver1:31
Configure Resolver Demo1:54
Useful Utilities For Testing DNS2:36
Useful Utilities For Testing DNS Demo2:09
Summary of Master DNS Server Implementation3:55
Set up a master dns server on 172.24.0.1 with bind and bind-utils. Configure named.conf, create forward and reverse zones for example.com and 172.24.0.0, then test with host, nslookup, and dig.

Configure Web Server2:49
Configure an Apache web server on the master DNS system, create a sample index.html in /var/www/html, set ServerName to 172.24.0.1 for test deployment, and start the httpd service.
Configure Web Server Demo3:23
Test DNS & Web Server1:29
Configure FTP Server1:46
Test DNS & FTP Server1:42
Test DNS Server From Client2:26
Edit /etc/resolv.conf to test dns from the client, verify 172.24.0.1 on port 53 with nslookup, then use elinks to browse http://www.example.com and ftp://download.example.com, confirming www is aliased to master.example.com.
Test DNS Server From Client Demo5:23

Modify Master DNS Server Zone Files6:22
Modify Master DNS Server Zone Files Demo5:18
Configure Slave DNS Server4:00
Configure Slave DNS Server Demo5:20
Start Slave DNS Server2:54
View Master, Slave DNS Server Log Files3:37
Learn to verify master-slave DNS transfers by viewing logs in /var/log with tail, identify AXFR full transfers and IXFR incremental updates, and track serial numbers via SOA.
Again Modify Master DNS Zone Files1:54
Again Modify Master DNS Zone Files Demo2:21
Modify master DNS zone files: update forward and reverse records, increase the serial, add an A for 172.24.0.11 and a PTR for 11 to client.example.com, then reload DNS and verify.
View Log Files3:21
Verify Master, Slave DNS From Client2:07
Verify Master, Slave DNS From Client Demo3:31
Test Using DNS Utility - nslookup3:48
Test Using DNS Utility - nslookup Demo4:17
Test Using DNS Utility - dig4:52
Test Using DNS Utility - dig Demo4:32
Test Using DNS Utility - host2:54
Explore testing a dns server with host -t options, nslookup, and dig to query ns, mx, soa, a, and ptr records and verify reverse resolutions.

Round Robin DNS Introduction5:54
Round Robin DNS Introduction Demo2:58
Modify DNS Files on Master System3:52
Modify DNS Files on Master System Demo4:30
Modify the dns forward file in /var/named with vi to add two www a records with ttl 0 for round-robin dns, then restart named and verify with nslookup and dig.
Test Round Robin DNS1:43
Configure Web Server on Master & Slave Systems3:30
Implement a web server on master and slave, configuring httpd with ServeName and listening addresses, restarting services, and testing with host and nslookup while considering round-robin DNS caching.
Configure Web Server on Master & Slave Systems Demo5:25

What is Named Based Virtual Hosting2:55
Configure Web Server for Named Based Virtual Hosting4:55
Configure Web Server for Named Based Virtual Hosting Demo7:49
Verify or install tree, create /var/www/html/example1, /var/www/html/example2, /var/www/html/example3 with index.html, then configure named based virtual hosting on 172.24.0.1 by setting ServerName and DocumentRoot for each site, and restart httpd.
Configure DNS Server for Named Based Virtual Hosting2:16
Configure DNS Server for Named Based Virtual Hosting Demo5:43
configure named.conf and forward files to set up three zone files for example1.com, example2.com, and example3.com; copy forward as example1, example2, example3, adjust permissions, and verify dns in /var/named.
Create Zone Files2:56
Create Zone Files Demo2:32
Test Named Based Virtual Hosting2:12
Master and test name based virtual hosting with BIND DNS by configuring resolv.conf, querying multiple domains with host, and confirming all resolve to the same IP 172.24.0.1.
Test Named Based Virtual Hosting Demo4:15

What is IP Based Virtual Hosting?3:44
Learn how to implement IP-based virtual hosting with DNS by mapping www.example1.com, www.example2.com, and www.example3.com to 172.24.0.1, 172.24.0.2, and 172.24.0.3, and configure Apache accordingly.
How to Configure Additional IPs on Master System2:30
Configure Web Server For IP Based Hosting2:57
Edit httpd.conf to implement ip based virtual hosting with virtualhost entries for 172.24.0.1, 172.24.0.2, and 172.24.0.3, with document roots, then restart; dns resolves example1.com, example2.com, and example3.com to these ips.
Configure Web Server For IP Based Hosting Demo2:42
Configure ip based virtual hosting by editing /etc/httpd/conf/httpd.conf, assigning ip addresses 172.24.0.1, 172.24.0.2, and 172.24.0.3 to each virtual host, and restart httpd.
Create Zone Files For IP Based Hosting4:25
Create Zone Files For IP Based Hosting Demo4:14
Verify named.conf and group permissions, create zone files for example1.com, example2.com, and example3.com, adjust A records to 172.24.0.1 and related IPs, then restart named and httpd.
Test IP Based Virtual Hosting2:12
Test IP Based Virtual Hosting Demo2:49
Verify IP based virtual hosting by inspecting resolv.conf and using elinks, host, ping, and nslookup to confirm multiple site resolutions, demonstrating the DNS role in IP based hosting.

Split Namespace Lab Setup8:57
Split Namespace Lab Setup Demo3:26
Edit named.conf File5:27
Edit named.conf File Demo7:12
Create Zone Files2:45
Create Zone Files Demo4:05
Configure Web Server2:28
Test Split Namespace From Client c113:33
Test Split Namespace From Client c11 Demo3:35
Test split namespace from client c11 using host, nslookup, dig, elinks, and ping to verify the DNS server resolves to 172.24.0.1.
Test Split Namespace From Client c212:04
Test Split Namespace From Client c21 Demo3:51
Test Split Namespace From Client c311:21
Verify dns and routing on the c31 system by checking hostname, dnsdomainname, resolv.conf, ip route show with head -1, and use host, nslookup, and dig to confirm 10.0.0.31 and 10.0.0.1.
Test Split Namespace From Client c31 Demo4:41
Test the split namespace from client c31, verifying hostname, domain, and DNS settings with host, nslookup, dig, and ping. Demonstrates DNS views delivering client-specific responses.
Summary of Split Namespace Implementation2:50

Postfix Mail Server Introduction6:38
Install Required Packages9:18
Configure DNS Server7:06
Configure DNS Server Demo8:54
Configure Postfix Server (SMTP)10:46
Configure the postfix mail server by backing up main.cf, editing with vim to set hostname, domain, inet_interfaces, mydestination, and masquerade_domain, and prepare dovecot integration.
Configure Dovecot Server (POP and IMAP)6:42
Test SMTP using Telnet4:17
Test POP using Telnet3:33
Configure SquirrelMail7:30
Use Webmail from Client6:01
Test whether everything working correctly2:33
Yum Update Troubleshooting5:12
Backup Current Repository Configuration:
First, make a backup of your current repository configuration files.

cp /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.bak

Edit the Repository Configuration:
Open the CentOS-Base.repo file in a text editor. (vi or nano)

nano /etc/yum.repos.d/CentOS-Base.repo

Update the Base Repository URLs:

Replace the existing base repository URLs with the URLs pointing to the CentOS Vault. The updated configuration should look something like this:

[base]
name=CentOS-$releasever - Base
baseurl=http://vault.centos.org/7.9.2009/os/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

[updates]
name=CentOS-$releasever - Updates
baseurl=http://vault.centos.org/7.9.2009/updates/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

[extras]
name=CentOS-$releasever - Extras
baseurl=http://vault.centos.org/7.9.2009/extras/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

Save the Changes:

Save the changes and exit the text editor (Ctrl+X, Y, Enter for nano).

Clean YUM Cache:

Clean the YUM cache to ensure it uses the updated repository configuration.

yum clean all
yum makecache

Update the System:

Now you can update your system using the Vault repositories.

yum update

This should allow you to continue using yum with the archived CentOS 7 repositories.
DNS Quiz

Requirements

Basic knowledge of Linux
Desire to learn DNS

Description

DNS (Domain Name System) is critical component of networking. But very few persons are capable of handling DNS properly. This course will start from basic and slowly and slowly will takes you towards advanced concepts. For this course, we are using CentOS 7 Linux distribution and implementing BIND DNS Server.

This course will cover:

- How to configure Master DNS Server

- How to configure Slave DNS Server

- How to implement Round Robin DNS Server

- How to configure Split View (Split Brain)

- How to implement Named Based Virtual Hosting

- How to implement IP Based Virtual Hosting

- You will learn how to implement DNS server in a Linux Environment. Different Scenarios will be discussed.

- How to setup the different labs required for this course has been covered.

- How to test DNS Server using host, nslookup and dig utilities.

- How the communication between master and slave DNS Server works.

- What are resource records, zone files and types of queries will be covered.

We will be combining various servers with DNS Server:

- Using Apache Web Server with DNS to implement Named based and IP based virtual hosting.

- Use VSFTPD (Very Secure File Transfer Protocol Daemon) server with DNS

- How to configure Postfix Mail Server (Simple Mail Transfer Protocol)

- How to configure Dovecot (Post Office Protocol, Internet Messaging Application Protocol)

- How to configure DNS Server for implementing Mail Server

- How to configure SquirrelMail for web access.

Who this course is for:

Anyone who wants to handle DNS on Linux

Mastering BIND DNS

What you'll learn

Explore related topics

Course content

BIND DNS Lab Setup8 lectures • 45min

DNS Introduction8 lectures • 23min

Master DNS Server Implementation25 lectures • 1hr 45min

Testing Master DNS Server Implemention7 lectures • 19min

Master, Slave DNS Server Implementation16 lectures • 1hr 1min

Round Robin DNS7 lectures • 28min

Named Based Virtual Hosting Using DNS.9 lectures • 36min

IP Based Virtual Hosting Using DNS8 lectures • 26min

Split Namespace14 lectures • 56min

Postfix Mail Server and DNS12 lectures • 1hr 19min

Requirements

Description

Who this course is for: