CENTOS7 Firewall-cmd See if ports are open and open ports

Query port number 80 to open: Firewall-cmd --query-port = the / TCP

permanently open 80 Port number: firewall-cmd--permanent--zone=public --add-port = the / TCP

Removing the 80 port number:firewall-cmd--permanent--zone=public --remove-port= TCP

--zone #作用域
--add-port=80/tcp   #添加端口 in the format: port/Communication protocol
--permanent   #永久生效, no failure after this parameter is restarted

View firewall Status
SystemctlStatusFirewalld.service
Start | Close | Restart Firewall
Systemctl[ start| Stop | Restart ] Firewalld.service

CENTOS7 Firewall-cmd See if ports are open and open ports