centos firewall configuration

1 check firewall service status
systemctl status firewalld

2 check firewall status
firewall-cmd --state

3 open,restart,close firewalld service

# start
service firewalld start
# restart
service firewalld restart
# close
service firewalld stop

4 check firewall rules
firewall-cmd --list-all

5 edit rules

# check open port
firewall-cmd --query-port=8080/tcp
# open 80 port
firewall-cmd --permanent --add-port=80/tcp
# remove port
firewall-cmd --permanent --remove-port=8080/tcp
#restart firewall (need restart firewall after config change)
firewall-cmd --reload