CentOS permanent open port number

This article personal blog address ：CentOS7 Open port （ permanent ） (leafage.top)

Usually in linux After the service is installed and started on , The Internet is inaccessible by default , Because the firewall doesn't allow , So turn on the firewall , Let it have access to these port numbers （ With redis For example ）.

Method 1 ： Use firewall

1、 Run the command ：

firewall-cmd --get-active-zones
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After running , You can see zone name , as follows ：

2、 Execute the following command ：

firewall-cmd --zone=public --add-port=6379/tcp --permanent
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3、 service iptables restart , Run the command ：

firewall-cmd --reload
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4、 Check whether the port number is on , Run the command ：

firewall-cmd --query-port=6379/tcp
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Method 2 ： Use iptables

1、 First run the following command ：

/sbin/iptables -I INPUT -p tcp --dport xxx -j ACCEPT
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2、 And then run ：

/etc/rc.d/init.d/iptables save
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Or the following operation commands ：

-A INPUT -m state –state NEW -m tcp -p tcp –dport xxx -j ACCEPT
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And then execute the command ：

-A INPUT -j REJECT –reject-with icmp-host-prohibited
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notes ：xxx —— Indicates the port number you want to open , Such as ：6379

test ： stay windows Press down win+R key , Input cmd, Run the command ( To be opened telnet), If it becomes empty, it means success ：

telnet  192.168.xx.xx 6379
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notes ： Turn on telnet The method is as follows ：

1. Go to the control panel , Choose the program ;

2. Click on the program , Enter programs and functions ;

3. Check telnet function , Click ok .