First, the firewall is turned on, turn off, disable command
(1) Setting a power-enable the firewall: systemctl enable firewalld.service
(2) set the boot disable the firewall: systemctl disable firewalld.service
(3) start the firewall: systemctl start firewalld
(4) turn off the firewall: systemctl stop firewalld
(5) Check the firewall status: systemctl status firewalld
Second, the use configuration port firewall-cmd
(1) View firewall status: firewall-cmd --state
(2) reload the configuration: firewall-cmd --reload
(3) View open ports: firewall-cmd --list-ports
(4) open the firewall port: firewall-cmd --zone = public --add-port = 9200 / tcp --permanent
Command Meaning:
-zone # Scope
-add-port = 9200 / tcp # Add port, the format is: port / protocol
-permanent # permanent, this parameter does not restart after failure
(5) off the firewall port: firewall-cmd --zone = public --remove-port = 9200 / tcp --permanent
Note: After you add the port, must be reloaded with the command firewall-cmd --reload again take effect