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Linux Firewall port

2022-01-27 02:12:37 Carrot rabbit

cento7.4 Firewall port

Linux System operation and Maintenance Notes ,CentOS 7.4 Firewall configuration

1、 see firewall Service status

systemctl status firewalld
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2、 see firewall The state of

firewall-cmd --state
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3、 Turn on 、 restart 、 close 、firewalld.service service

Turn on

service firewalld start

restart

service firewalld restart

close

service firewalld stop

4、 View firewall rules

firewall-cmd --list-all
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5、 Inquire about 、 to open up 、 Close the port

Copy code

Check whether the port is open

firewall-cmd --query-port=8080/tcp

to open up 80 port

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

Remove port

firewall-cmd --permanent --remove-port=8080/tcp
# service iptables restart ( After modifying the configuration, restart the firewall )
firewall-cmd --reload

Parameter interpretation
firwall-cmd yes Linux Operations provided firewall A tool for
–zone Scope
–add-port=80/tcp # Add port , The format is : port / Communication protocol
–permanent permanent , Failure after restart without this parameter

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