Open & Close a port in a machine

As a developer, you also need to deploy some war file to a VM  so that yo can have a test or for other aim.

You need to know that the configuration file is located in :/etc/sysconfig/iptables

First, you may want to check whether the port is opened , you can run this command: iptabes -nL,

then you will see all of the opened ports.

After that , there are two ways to open port:

1. vi /etc/sysconfig/iptables  -> add one more line: -A INPUT -p tcp -m tcp --dport 8889 -j ACCEPT ->/etc/init.d/iptables restart
2. if you don't want to modify the iptables file, you can simply run the comman: iptables -I INPUT -p tcp --dport 8889 -j ACCEPT

 

You might have a case that need to close a port, then you can :

iptables -I OUTPUT -p tcp --dport 8889 -j DROP