~]$ sudo netstat -nltp
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      972/sshd
tcp        0      0 0.0.0.0:5355            0.0.0.0:*               LISTEN      673/systemd-resolve
tcp6       0      0 :::22                   :::*                    LISTEN      972/sshd
tcp6       0      0 :::5355                 :::*                    LISTEN      673/systemd-resolve

~]$ sudo firewall-cmd --add-port=8080/tcp --zone=public --permanent
Warning: ALREADY_ENABLED: 8080:tcp
success

현재 이상태입니다... 8080을 추가하려면 어떻게 해야할까요...?