Adding and removing firewall rules on the command line

In this section, we're going to look at adding and removing example rules from our firewall setup.

Getting ready

Ensure that firewalld is installed and started on centos1:

$ sudo systemctl enable --now firewalld

Once done, start a Python web server in the background:

$ python -m SimpleHTTPServer &> /dev/null &
[1] 2732

This should start a web server on port 8000.

Connect to centos2 and try to curl your centos1 box on port 8000. It should fail:

$ curl 192.168.33.10:8000
curl: (7) Failed connect to 192.168.33.10:8000; No route to host

If you want to work through the Ubuntu examples at the same time, log in to your Ubuntu box.

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