Resolv.conf deprecated

resolv.conf

# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
#     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
nameserver 127.0.1.1
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Before systemctl was implemented, you would put the DNS nameservers in resolv.conf

Since the implementation of systemctl the resolv.conf file is no longer user edited. The package that makes the change is called resolvconf.

A script called /etc/network/if-up.d/000resolvconf is responsible for overwriting resolv.conf

see: /sbin/resolvconf -a "${IFACE}.${ADDRFAM}"

It is possible to specify base DNS servers for resolvconf at /etc/resolvconf/resolv.conf.d/base, which won't be overwritten.

It uses the same syntax. That way you can keep running Ubuntu or Mint the default way. Then tell resolvconf to regenerate resolv.conf with sudo resolvconf -u.

Hover, you can remove resolvconf: sudo apt-get remove resolvconf. It is safe to do so. Then write your desired DNS resolvers into /etc/resolv.conf

STEPS TO MANUALLY ADDING DNS SERVER USING /etc/resolvconf/resolv.conf.d/base

1. Open the file in the editor

sudo vi /etc/resolvconf/resolv.conf.d/base

2. add the DNS server you desire and save

nameserver 8.8.8.8

3. force reload so it writes to /etc/resolv.conf

resolvconf -u