Open firewall port on CentOS 7

centos port firewall
Knows Not Much picture Knows Not Much · Jul 14, 2014 · Viewed 911.7k times · Source

I am using CentOS 7 and I have to ensure that ports 2888 and 3888 are open.

I read this article but this did not work because on CentOS 7 OS there is no iptables save command.

Someone told me that the above URL is not valid for CentOS 7. and I should follow this. But this article is not clear to me on exactly what command I need to execute.

I also found 

firewall-cmd --zone=public --add-port=2888/tcp

but this does not survive reboots.

So how can I open the ports and make it survive reboots?

Answer

ganeshragav picture ganeshragav · Jul 14, 2014

Use this command to find your active zone(s):

firewall-cmd --get-active-zones

It will say either public, dmz, or something else. You should only apply to the zones required.

In the case of public try:

firewall-cmd --zone=public --add-port=2888/tcp --permanent

Then remember to reload the firewall for changes to take effect.

firewall-cmd --reload

Otherwise, substitute public for your zone, for example, if your zone is dmz:

firewall-cmd --zone=dmz --add-port=2888/tcp --permanent

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