How To Install DNS Server on Ubuntu 20.04 LTS

Install DNS Server on Ubuntu 20.04

In this tutorial, we will show you how to install DNS Server on Ubuntu 20.04 LTS. For those of you who didn’t know, DNS servers very important tool for your network because many IP addresses can’t remember so can remember DNS name. BIND or BIND 9 is an open-source implementation of DNS, available for almost all Linux distributions. BIND stands for Berkeley Internet Name Domain and it allows us to publish DNS information on the internet as well as allows us to resolve DNS queries for the users. BIND is by far the most used DNS software on the Internet.

This article assumes you have at least basic knowledge of Linux, know how to use the shell, and most importantly, you host your site on your own VPS. The installation is quite simple and assumes you are running in the root account, if not you may need to add ‘sudo‘ to the commands to get root privileges. I will show you the step-by-step installation of the DNS Server (Bind9) on Ubuntu 20.04 (Focal Fossa). You can follow the same instructions for Ubuntu 18.04, 16.04, and any other Debian-based distribution like Linux Mint.

Install DNS Server on Ubuntu 20.04 LTS Focal Fossa

Step 1. First, make sure that all your system packages are up-to-date by running the following apt commands in the terminal.

sudo apt update
sudo apt upgrade

Step 2. Installing DNS Server on Ubuntu 20.04.

Now we install BIND using the following command below:

sudo apt install bind9 bind9utils bind9-doc

By default, BIND automatically starts after installation. You check its status with:

sudo systemctl status named

Once the installation process is complete, you can check if BIND9 is working:

nslookup google.com 127.0.0.1

Output:

Server: 127.0.0.1
Address: 127.0.0.1#53
Non-authoritative answer:
Name: google.com
Address: 142.250.4.94
...

Step 3. Configuration BIND9.

The main configuration file is named.conf.options, let’s open it:

sudo nano /etc/bind/named.conf.options

The “listen-on” directive allows you to specify the networks that the DNS server will serve:

listen-on {
10.10.10.0/24;
10.1.0.0/16;
...
};

BIND9 only allows local queries by default. Add the necessary IP addresses to the “allow-query” directive or “any;” to allow all requests:

allow-query { any; };

Forwarders contain the IP addresses of DNS servers to which the request is redirected if our server does not contain the required data:

forwarders {
8.8.8.8;
8.8.4.4;
};

Finally, save and close the file. Check the configuration:

sudo named-checkconf
sudo systemctl restart bind9

Step 4. Configure Firewall.

In case OS firewall is running on your bind server then execute the below command to allow bind port:

sudo ufw allow Bind9

Step 5. Testing BIND.

To check if the DNS server is working properly, enter the following command:

nslookup google.com

Output:

Server:		103.86.96.100
Address:	103.86.96.100#53

Non-authoritative answer:
Name:	google.com
Address: 172.217.194.101
Name:	google.com
Address: 172.217.194.100
Name:	google.com
Address: 172.217.194.138
Name:	google.com
Address: 172.217.194.102
Name:	google.com
Address: 172.217.194.113
Name:	google.com
Address: 172.217.194.139

Congratulations! You have successfully installed DNS Server. Thanks for using this tutorial for installing the DNS Server (Bind9) on your Ubuntu 20.04 LTS Focal Fossa system. For additional help or useful information, we recommend you check the official Ubuntu website.

VPS Manage Service Offer
If you don’t have time to do all of this stuff, or if this is not your area of expertise, we offer a service to do “VPS Manage Service Offer”, starting from $10 (Paypal payment). Please contact us to get the best deal!