How to open a port in CentOS

In CentOS system usage, we will encounter many problems. For example, if the CentOS system is installed, only port 22 is enabled by default. if you want to open other ports, you need to open the required ports. For example, how do I enable http's default port 80? Next, we will introduce a method for you and hope you will have a good experience. First, we need to use the CentOS system, and we will encounter many problems. For example, if the CentOS system is installed, only port 22 is enabled by default. if you want to open other ports, you need to open the required ports. For example, how do I enable http's default port 80? Next, we will introduce a method for you and hope you will have a good experience.

First, Edit Iptables
Vi/etc/sysconfig/iptables
Vi/etc/sysconfig/iptables

Then add
-A RH-Firewall-1-INPUT-m state -- state NEW-m tcp-p tcp -- dport3001-j ACCEPT
-A RH-Firewall-1-INPUT-m state -- state NEW-m tcp-p tcp -- dport3001-j ACCEPT

Finally, the CentOS system needs to restart the service.
/Sbin/service iptables restart
/Sbin/service iptables restart

Check whether the port is open
/Sbin/iptables-L-n
In this way, we can open the port under the CentOS system. I hope you will have some gains.