Firewalld

start firewalld

systemctl start firewalld

look at state of firewalld

firewall-cmd --state

Which is the default zone

sudo firewall-cmd --get-default-zone
FedoraWorkstation

open port in default zone

firewall-cmd --add-port=8080/tcp

open port 8081/tcp in public zone

firewall-cmd --zone=public --add-port=8081/tcp

get active zones

firewall-cmd --get-active-zones
FedoraWorkstation
  interfaces: enp1s0

list zone configuration

firewall-cmd --zone=public --list-all
public
 target: default
 icmp-block-inversion: no
 interfaces: 
 sources: 
 services: dhcpv6-client mdns ssh
 ports: 
 protocols: 
 masquerade: no
 forward-ports: 
 source-ports: 
 icmp-blocks: 
 rich rules:

move interface enp1s0 to trusted zone

firewall-cmd --zone=trusted --change-interface enp1s0

list available services

firewall-cmd --get-services

list available zones

firewall-cmd --get-zones