CentOS 7 / RHEL 7 – Open ports

Travis —  June 13, 2015 — Leave a comment

One of the most common things I do on Linux machines is open ports to test software in a development environment.  In the past, that meant trying to remember (and Googling) cryptic iptables commands.  Now, CentOS 7 and Red Hat 7 include the nicer firewall-cmd tool to configure the firewall.

First, ensure the firewall-cmd service is running:

Now, the following command will open port 8080 for TCP traffic, for the current session only:

If you want to make the change persist across reboots, you can add the --permanent flag, and then do a --reload to make the change take effect in the current session.

Now port 8080 should be open.  To verify, you can run with --list-all and look at the list of ports:

If you want to remove port 8080, you would use the --remove-port flag, with the --permanent flag if you want to persist the change:

You can use --list-all again to verify that the port has been removed:

This is a very quick introduction to firewall-cmd.  There is much more to learn, but this is a quick, basic task that I find myself doing frequently.

For more reading, see:

 

Related posts from Linux Brigade!

  • Install CSF/LFD Firewall on your Linux Server The first thing on your mind when setting up a new Linux server (dedicated or VPS) is how you can increase security.  One of the best tools in your bag of tricks should be the CSF […]
  • Untangle your networkUntangle your network Whether you’re the admin of your office network or your home network (or both), it’s always a good idea to have security and order in place. Untangle is software that you can install as […]
  • Download CentOS 7 Nightly BuildsDownload CentOS 7 Nightly Builds As the CentOS folks are working on releasing a final version of CentOS 7, you can get in on the action and download their nightly builds. We’re estimating (guessing? Based on previous […]
  • Can’t afford a full time Linux admin?Can’t afford a full time Linux admin? If you’re just starting out, it’s tough being able to afford full time Linux support.  Why not employ Hosting Support Services instead?  We’re Red Hat certified, fluent with Red […]
  • Learn the CSF command line options You have CSF installed and use the GUI to do most things.  (If you don’t have it installed yet, you can read our article on how to install csf).  BUT – knowing the csf (ConfigServer […]

No Comments

Be the first to start the conversation.

Leave a Reply

Text formatting is available via select HTML.

<a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code class="" title="" data-url=""> <del datetime=""> <em> <i> <q cite=""> <s> <strike> <strong> <pre class="" title="" data-url=""> <span class="" title="" data-url=""> 

*