Setup servers own domain

Install DNSMasq

apt-get install dnsmasq

Specify domains in /etc/dnsmasq.conf

address=/tothnet.hu/127.0.0.1
address=/example.com/127.0.0.1

Add DNSMasq to /etc/resolv.conf

The local nameserver should be the first nameserver.

# This file belongs to man:systemd-resolved(8). Do not edit.
#
# This is a static resolv.conf file for connecting local clients to the
# internal DNS stub resolver of systemd-resolved. This file lists no search
# domains.
#
# Run "systemd-resolve --status" to see details about the uplink DNS servers
# currently in use.
#
# Third party programs must not access this file directly, but only through the
# symlink at /etc/resolv.conf. To manage man:resolv.conf(5) in a different way,
# replace this symlink by a static file or a different symlink.
#
# See man:systemd-resolved.service(8) for details about the supported modes of
# operation for /etc/resolv.conf.

nameserver 127.0.0.1
nameserver 127.0.0.53

Restart DNSMasq

systemctl restart dnsmasq