SELinux stands for Security-Enhanced Linux. It is a Linux kernel security model that provides a hardened set of access control security policies for the Linux operating system.

SELinux tends to get a bad rap, because it often seems to go out of its way to prevent legitimate applications from working.

This guide, created by Jack Wallen for TechRepublic Premium, explains how SELinux works and offers some useful tips to improve your knowledge.

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HOW TO ALLOW PORTS WITH SELINUX

With semanage you can also allow specific ports. Say, for instance, you’ve opted to configure SSH to use port 33000, and SELinux isn’t allowing traffic through? For that, you use semanage similar to how you did with the files above, only including the protocol (via the -p option) and the port like so:

sudo semanage port -a -t ssh_port_t -p tcp 33000

At this point (so long as you have SSH configured properly), SELinux won’t block your SSH connections to port 33000.

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TIME SAVED: Crafting this content required 18 hours of dedicated writing, editing and research.