How to configure Linux firewall and open ports 80 and 3306

Port 80 is also configured. First enter the firewall configuration file

shell># vim /etc/sysconfig/iptables

Add the following two rules:

-A INPUT -m state --state NEW -m tcp -p tcp --dport 3306 -j ACCEPT

-A INPUT -m state --state NEW -m tcp -p tcp --dport 80 -j ACCEPT

Special note: Many netizens add these two rules to the last line of the firewall configuration, causing the firewall to fail to start

The correct rule should be added below the default port 22 rule.

The added firewall configuration files are as follows:

Restart the firewall, done!

shell>#service iptables restart

The above are all the relevant knowledge points introduced this time. I hope it can help everyone.