Configure a Firewall with Firewalld (Create and List Rules)
https://www.linode.com/docs/guides/introduction-to-firewalld-on-centos/
WebSep 28, 2015 · RHEL/CentOS. Firewalld is preinstalled on many Linux distributions, such as RHEL and its derivatives (including CentOS, AlmaLinux, and Rocky Linux), CentOS Stream, Fedora, and openSUSE Leap. If you are running one of these distribution, you do not need to perform any installation steps. Ubuntu and Debian. Install the firewalld package.
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