CentOS7 USES firewalld to open and close firewalls and ports

1. Basic use of firewalld

Activation:

 systemctl start firewalld

View status:

systemctl status firewalld 

Stop:

systemctl disable firewalld

Disable:

systemctl stop firewalld

2.systemctl is the main tool in CentOS7's service management tools. It integrates the functions of service and chkconfig in body 1.

Start 1 service:

systemctl start firewalld.service

Close 1 service:

systemctl stop firewalld.service

Restart 1 service:

systemctl restart firewalld.service

Display the status of a service:

systemctl status firewalld.service

Enable 1 service at startup:

systemctl enable firewalld.service

Disable 1 service when booting:

systemctl disable firewalld.service

Check whether the service starts up:

systemctl status firewalld 

0

View the 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

See 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 reject status:

firewall-cmd --panic-off

Check whether to reject:

firewall-cmd --query-panic

How do you open a port

add

firewall-cmd --zone=public --add-port=80/tcp --permanent  

(--permanent is permanently in effect, and will fail after restart without this parameter)

Reload the

firewall-cmd --reload

To view

firewall-cmd --zone= public --query-port=80/tcp

delete

firewall-cmd --zone= public --remove-port=80/tcp --permanent