How to set Permanent DNS Nameservers on Debian 11.3

To Set Permanent DNS Nameservers On Debian 11.3

Introduction

DNS stands for Domain Name System server, which is responsible for translating a domain name into an IP address. Using custom DNS servers on Linux can improve performance and security.

Installation Procedure:

Step 1: Check the OS version by using the below command

root@linuxhelp: ~# lsb_release -a
No LSB modules are available.
Distributor ID:	Debian
Description:	Debian GNU/Linux 11 (bullseye)
Release:	11
Codename:	bullseye

Step 2: Install the resolvconf package by using the below command

root@linuxhelp: ~# apt install resolvconf
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
The following NEW packages will be installed:
  resolvconf
0 upgraded, 1 newly installed, 0 to remove and 263 not upgraded.
Need to get 54.7 kB of archives.
After this operation, 203 kB of additional disk space will be used.
Get:1 http://in.archive.Debian.com/ubuntu hirsute/universe amd64 resolvconf all 1.84ubuntu1 [54.7 kB]

Fetched 54.7 kB in 6s (9,526 B/s)     
Preconfiguring packages ...
Selecting previously unselected package resolvconf.
(Reading database ... 151399 files and directories currently installed.)
Preparing to unpack .../resolvconf_1.84Debian1_all.deb ...
Unpacking resolvconf (1.84Debian1) ...
Setting up resolvconf (1.84Debian1) ...
Created symlink /etc/systemd/system/sysinit.target.wants/resolvconf.service → /lib/systemd/system/resolvconf.service.
Created symlink /etc/systemd/system/systemd-resolved.service.wants/resolvconf-pull-resolved.path → /lib/systemd/system/resolvconf-pull-resolved.path.
Created symlink /etc/systemd/system/systemd-resolved.service.wants/resolvconf-pull-resolved.service → /lib/systemd/system/resolvconf-pull-resolved.service.

Step 3: Start the resolvconf service by using the below command

root@linuxhelp:~# systemctl start resolvconf.service

Step 4: Enable the resolvconf service by using the below command

root@linuxhelp:~# systemctl enable resolvconf.service
Synchronizing state of resolvconf.service with SysV service script with /lib/systemd/systemd-sysv-install.
Executing: /lib/systemd/systemd-sysv-install enable resolvconf

Step 5: Check the status of the resolvconf service by using the below command

root@linuxhelp:~# systemctl status resolvconf.service
● resolvconf.service - Nameserver information manager
     Loaded: loaded (/lib/systemd/system/resolvconf.service; enabled; vendor preset: enabled)
     Active: active (exited) since Sat 2021-10-30 22:53:19 IST; 1min 55s ago
       Docs: man:resolvconf(8)
   Main PID: 6298 (code=exited, status=0/SUCCESS)
      Tasks: 0 (limit: 2257)
     Memory: 0B
     CGroup: /system.slice/resolvconf.service

Step 6: Enter the nameservers in the resolv.conf.d by using the below command

root@linuxhelp:~# nano /etc/resolvconf/resolv.conf.d/head

Step 7: Update the resolvconf by using the below command

root@linuxhelp:~# resolvconf -u

Step 8: Check the nameserver entry reflected in resolv.conf by using the below command

root@linuxhelp:~# nano /etc/resolv.conf 

Conclusion:

We have reached the end of this article. In this guide, we have walked you through the steps required to Set Permanent DNS Nameservers on Debian 11.3. Your feedback is much welcome.