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This article mainly shows you "how to install firewall in Linux system". The content is simple and easy to understand. It is clearly organized. I hope it can help you solve your doubts. Let Xiaobian lead you to study and learn "how to install firewall in Linux system".

Centos7 installed in the virtual machine is the minimum installation method, so many things are not installed, you need to install them manually. I want to open port 3306 through firewall, but I found that the file does not exist through vi /etc/sysconfig/iptables. The Internet says that iptables firewall is not installed. You can install iptables firewall by following command.

systemctl stop firewalld systemctl mask firewalld yum install iptables-services iptables status //set boot startup systemctl enable iptables 123456 open specific ports1. view status: iptables -L -n 2. edit file directly: vi /etc/sysconfig/iptables 3. open port: -A INPUT -m state-state NEW -m tcp -p tcp-dport 3306 -j ACCEP4. save file: wq5, restart firewall: service iptables restart Remarks: batch open port-A INPUT -p tcp -m tcp-dport 18080:18090 -j ACCEPT Note: the added statement of opening port 3306 must be before icmp-host-prohibited. I don't know. At the end, the statement of opening port 3306 is added, which causes local Dbvisual to be unable to connect to the database all the time. It is really a pit. I hope you don't make the same mistake.

Update: See if ports are open

/sbin/iptables -L -n 1 When you configure the restart firewall in/etc/sysconfig/iptables, it is best to see if your configuration works by checking the port opening situation. Don't take it for granted.

The above is "Linux system how to install firewall" all the content of this article, thank you for reading! I believe that everyone has a certain understanding, hope to share the content to help everyone, if you still want to learn more knowledge, welcome to pay attention to the industry information channel!

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