![]() ![]() The main reason could be because the system’s DNS settings are misconfigured or you prefer to use specific name servers or your own. In this article, we will show how to install and use the resolvconf program to set permanent DNS name servers in /etc/nf file under Debian and Ubuntu Linux distributions. Unfortunately, because the /etc/nf is indirectly managed by the systemd-resolved service, and in some cases by the network service (by using initscripts or NetworkManager), any changes made manually by a user can not be saved permanently or only last for a while. If you run the following ls command on the /etc/nf, you will see that this file is a symlink to the /run/systemd/resolve/nf file. ![]() The DNS stub file contains the local stub 127.0.0.53 as the only DNS server, and it is redirected to the /etc/nf file which was used to add the name servers used by the system. By default, this service has four different modes for handling the Domain name resolution and uses the systemd DNS stub file ( /run/systemd/resolve/nf) in the default mode of operation. On modern Linux systems that use systemd (system and service manager), the DNS or name resolution services are provided to local applications via the systemd-resolved service. The functions are configured to check entries in the /etc/hosts file, or several DNS name servers, or to use the host’s database of Network Information Service ( NIS). The resolver is a set of functions in the C library that provide access to the Internet Domain Name System ( DNS). The /etc/nf is the main configuration file for the DNS name resolver library. ![]()
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