Notes for the Debian leafnode package:

Service startup
---------------

leafnode provides a socket-enabled systemd unit, but doesn't enable it
by default: There's no clear consensus in Debian whether socket-enabled
systemd generally phases out inetd invocation at this point and
non-systemd continues see (limited) support still.

For the vast majority of systemd systemd will be the preferred mode
of operation. For it you simply need to run

sudo systemctl enable --now leafnode.socket

If you prefer to use inetd (or if you don't use systemd, you can instead
use inetd. Debian's preferred configuration interface for inetd is
update-inetd (which is also a Suggest:ed package):

update-inetd --enable nntp --pattern tcp4

Configuration
-------------

See the leafnode(8) manual page and the sample configuration file for
documentation of the configuration file /etc/news/leafnode/config.

If you place any login and password information required to access
servers in the config file be sure to check that the permissions on that
file do not allow people to see this information who shouldn't be able
to.

 -- Moritz Muehlenhoff <jmm@debian.org>, Fri, 27 Jan 2023 22:52:13 +0100
