The linux centos7 firewall basically uses detailed explanation

1. Basic use of firewalld

Activation:

systemctl start firewalld

Check status:

systemctl status firewalld

Stop:

systemctl disable firewalld

Disable:

systemctl stop firewalld

2.systemctl is the main tool in CentOS7's service management tool, which combines the functions of service and chkconfig in one body.

Start the firewall:

systemctl start firewalld.service

Close the firewall:

systemctl stop firewalld.service

Restart the firewall:

systemctl restart firewalld.service

Display firewall status:

systemctl status firewalld.service

Firewall at startup:

systemctl enable firewalld.service

Disable firewall when starting up:

systemctl disable firewalld.service

Check whether the firewall is started:

systemctl status firewalld

0

View a list of started services:

systemctl list-unit-files|grep enabled

View the list of services that failed to start:

systemctl --failed

3. The configuration firewalld - cmd

View Version:

systemctl status firewalld

3

View Help:

systemctl status firewalld

4

Display status:

systemctl status firewalld

5

View all open ports:

systemctl status firewalld

6

Update firewall rules:

firewall-cmd --reload

View area information:

firewall-cmd --get-active-zones

View the region of the specified interface:

systemctl status firewalld

9

Reject all packages:

firewall-cmd --panic-on

Cancel the rejected status:

firewall-cmd --panic-off

Check whether to reject:

firewall-cmd --query-panic

4: Open port

add

firewall-cmd --zone=public --add-port=80/tcp --permanent   ( --permanent Permanent effect, no this parameter is rebooted after invalidity)  # open 80 port 

Reload the

firewall-cmd --reload

To view

firewall-cmd --zone=public --query-port=80/tcp  # To view 80 Whether the port is open 

delete

firewall-cmd --zone= public --remove-port=80/tcp --permanent # delete 80 Port configuration