$ sudo su -
# dnf -y install nfdump
# mkdir /var/log/netflow
# chown nobody:nobody /var/log/netflow
# firewall-cmd --permanent --zone=public --add-port=2055/udp
# firewall-cmd --reload
# cp netflow /etc/sysconfig/
# cp netflow.service /etc/systemd/system/
# systemctl daemon-reload
# systemctl enable --now netflow
Go and setup a netflow source on a router and point it at your new service. Once data arrives, there'll be a new directory in /var/log/netflow.
# nfexpire -u /var/log/netflow/* -t 8w
# exit
$ echo 'alias nfd="nfdump -r /var/log/[your favorite netflow source dir]"' >> ~/.bashrc
$ . ~/.bashrc
$ nfd | less