Setting Dns Server In Linux – DNS name servers (resolvers) provide a way to translate domain names into IP addresses. It is provided by ISPs (Internet Service Providers) and used by various devices to perform a DNS lookup of the requested domain.
In this guide, we will show you how to set up or configure a DNS name server on an Ubuntu system using various methods. All configurations are done on Ubuntu 20.04 system.
Setting Dns Server In Linux
Setting up a DNS name server from the Ubuntu desktop using the Network Manager is quite simple and requires no technical knowledge. Just follow the steps below.
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2. If you are connected to Wi-Fi, click on the “wifi” tab. Otherwise, if you have a “wired” connection, click the “Network” tab.
3. The settings window can also be opened from the upper right menu. Click the drop-down menu icon and select “wired options” from the list, also shown in the screenshot below:
4. To access Network Manager configurations, click the gear icon under the “wired” heading.
5. Now go to the “IPV4” settings tab and select the IPV4 method where the default is “Auto (DHCP)”.
Editing An Ovhcloud Dns Zone
To disable this option, enable the automatic button and enter the IP address of the DNS resolver, separated by commas to specify the DNS name server shown in the screenshot below:
In previous Ubuntu distributions, DNS resolvers could be easily configured using the ‘/etc/resolv.conf’ file, simply by editing the values and saving the file for use. The systemd-resolved service provides DNS name resolution for local applications or services and can be easily configured using Netplan, the default network management tool in Ubuntu 20.04.
1. Open a terminal by running the command list “ip a” with your Wi-Fi/Ethernet credentials. Carefully note down your IP address, netmask, and default gateway from the screenshot below when running the ip command.
2. Open the Netplan configuration file. All netplan configuration files are stored in the /etc/netplan directory. So open the file “/etc/netplan/01-network-manager-all.yaml”. The file name may vary from one installation to another. Enter the following command to open this configuration file using a nano text editor.
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The general syntax of this configuration file is shown below and can be modified by the system administrator.
“192.168.1.1” is the default gateway and the IP address is “10.0.2.15”. Change your gateway, netmask and IP in the configuration file above. More than two DNS name servers can be defined in the configuration, and these name servers must be separated by commas. In the above file, “220.127.116.11, 18.104.22.168” are the DNS resolvers for Google. Save the configuration file and exit it by pressing Ctrl+x.
The systemd-resolve -status command displays the dataset. That’s why you use the “grep” command to filter out the “DNS servers” string from all the details.
The following output is displayed in the terminal; it means it is checking the DNS name server and it is configured.
How To Configure Ubuntu Dns Server
To configure the DNS name server using Netplan and the network, copy the following code into the netplan configuration file:
To remove the default DNS or netplan configurations again, remove all data and insert the following code into the configuration file:
From the output below, you will see the default DNS name server that will be installed on your system:
In this article, we discussed how to configure a DNS name server using the desktop interface and the command line. We also saw how to configure netplan changes on an Ubuntu system to change the DNS name server. You can also set up a custom DNS nameserver using netplan and network services.
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Samreena Aslam holds a Master’s degree in Software Engineering. He currently works as a freelancer and technical writer. He is a Linux enthusiast and has written various articles on computer programming, various Linux variants including Ubuntu, Debian, CentOS and Mint. This comprehensive guide describes how to install and configure a DNS server on Ubuntu 16.04 LTS 64-bit server. As you already know, DNS is short for Domain Name System, which is used to convert hostnames to IP addresses and vice versa. For the purposes of this tutorial, I will be using three systems: one for the primary DNS server, one for the secondary DNS, and one for the DNS client. All systems run on Ubuntu 16.04 operating systems. Here is the IP address and hostname of each system.
After the system upgrade, run the following command to install the BIND9 packages used to configure the DNS server.
A caching name server stores the results of DNS queries locally for a period of time. It reduces DNS server traffic by keeping queries locally, thus improving DNS server performance and efficiency.
This file should contain the following lines. If there are no lines, just add them.
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Here for..lan is the direct zone file. rev..lan are reverse zone files. And 192.168.1.202 is the IP address of the secondary DNS server. We do this so that if the primary server is down, the secondary DNS will start receiving requests.
Add the IP address of the DNS server. In our case, the IP address of the DNS server matches the IP address of this machine.
A separate system is required to set up this server. We need a secondary DNS server because if there are problems with the primary DNS, the secondary DNS server will handle the queries.
Note that the path to the zone files must be the /var/cache/bind/ directory. That’s because AppArmor simply lets you write to it.
Slave Dns Server & Manager
Note. Note that the zone files will only be transferred if the serial number on the primary DNS server is higher than the serial number on the secondary DNS server.
Don’t forget to download the free GUIDE below that explains how to install and configure various server software on your Ubuntu system.
That’s all for now. If you find this guide useful, please share it on your social networks and support.
Senthilkumar Palani (aka SK) is the founder and editor-in-chief. He is a Linux/Unix enthusiast and FOSS supporter. Lives in Tamil Nadu, India.
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The Domain Name System (DNS) is used to resolve (convert) host names to Internet Protocol (IP) addresses and vice versa. A DNS server, also known as a name server, maps IP addresses to host names or domain names.
In this article, you’ll learn the basics of DNS, from how DNS obtains an IP address and hostname to the concepts of forward and reverse lookup zones. It will also show you how to install and configure DNS, define and edit zone files, and verify that DNS can resolve the correct address using commands. If you are new to DNS, this article will help you play around with it on your system with basic configurations.
When a client requests information from a name server, it typically connects to port 53, and then the name server resolves the requested name.
Configuring Dns Server
You may be wondering how DNS gets the IP address of the corresponding hostname or domain name. How does a DNS lookup between different IP addresses work and does your domain name map correctly? Who maintains these correspondences between domain names and IP addresses?
A forward lookup zone uses a domain name to look up IP addresses, while a reverse lookup zone uses IP addresses to look up a domain name.
First, add or edit two values in the options field. One is the DNS server address and the other is the permission request for either one.
(you can define zones in any of these files). In this example, I add the details of the zone definition
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The service is not running or disabled, then start and enable it. If it is already enabled (started) and you have completed all these settings, you will need to restart the service for the changes to take effect.
This example shows a reverse lookup where the DNS server matches servera.example.com as the domain name for 192.168.25.132:
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In this article, you learned what DNS is and how it works. Also, you now know what forward and reverse search zones are and how they work. You also learned about installing the BIND package, which is responsible for installing and configuring DNS on the system.
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In this first part of a two-part introduction to DNS troubleshooting, you’ll learn how to find and fix the problem.
In this second part of our two-part DNS troubleshooting series, learn more about DNS and its moving parts and what to do when they don’t work.
Ashish Bharadwaj is a passionate system administration, networking and programming practitioner at Red Hat. Ashish believes that open source is the future and contributing to technology and society is a great way to effectively solve problems and create new ideas or products. More about me
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