4

I need to open multiple different ports (not in ranges) on a CentOS machine.

I know how to open a port with firewall-cmd, but that gets bothersome for opening like 40 and more ports.

Is there a configuration file where I can define all open ports in one place? Sadly I didn't find anything regarding this.

3

You can define a service from an xml file containing all the ports you need, add a service from it and then enable it. Create the service.xml file like so:

<?xml version="1.0" encoding="utf-8"?>
 <service>
  <port port="port1" protocol="proto1"/>
  <port port="port2" protocol="proto2"/>
  <port port="port3" protocol="proto3"/>
  <port port="port4" protocol="proto4"/>
 </service>

Add new service:

# firewall-offline-cmd --new-service-from-file=service.xml --name=My_Service

Reload firewall-cmd:

# firewall-cmd --reload

Then add your service:

# firewall-cmd --add-service My_Service

8

You can always make a small script/one-liner:

#!/bin/bash
for i in 80 443 22 123 21 1337 31337
do
  firewall-cmd --zone=public --add-port=${i}/tcp
done
4

If those open ports are in a range for example 2379-2385, you can do as follows:

firewall-cmd --zone=zone_name --add-port=2379-2385/tcp 

To make it permanent add --permanent option at end.

3
firewall-cmd --permanent --add-port={80/tcp,443/tcp,9200/tcp,5601/tcp,5044/tcp}
firewall-cmd --reload
2
  • 1
    Please explain what this does and how it solves the problem. … … … … … … … … … Please do‌​ not respond in comments; edit your answer to make it clearer and more complete. … … … P.S.  Why not just do --add-port={80,443,9200,5601,5044}/tcp?
    – Scott
    Mar 26 '21 at 18:12
  • The trick {} used above is called Brace Expansion. May 3 '21 at 11:54

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