CentOS7 use systemctl Command to manage a single service of the system , stay CentOS7 In terms of firewalld（ firewall ） Service opening , close , The same instruction is used for status queries , The operation is as follows ：
Start firewall ： systemctl start firewalld
View firewall status ： systemctl status firewalld
Turn off the firewall ： systemctl stop firewalld
Enable firewall service at power on ：systemctl enable firewalld
Disable firewall service at power on ：systemctl disable firewalld
Query whether the firewall service is started ：systemctl is-enabled firewalld
Query the list of started services ：systemctl list-unit-files|grep enabled
Query the list of services that failed to start ：systemctl –failed
When installing software or column Library , In addition to directly opening and closing the firewall , You can also open the connection directly through the port operation ; Add port ：firewall-cmd –zone=public –add-port=80/tcp –permanent
Update firewall rules ：firewall-cmd –reload
View port status ：firewall-cmd –zone=public –query-port=80/tcp
Remove open ports ：firewall-cmd –zone=public –remove-port=80/tcp –permanent
Firewall rules are updated every time , All need to be updated ：firewall-cmd –reload, Update status ;
in addition , After updating the firewall settings , You can also view all open ports ：firewall-cmd –zone=public –list-ports
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