How do I persistently load a kernel module in Fedora 20? I have successfully followed the instructions for setting up 802.1q VLAN tagging in Fedora. Now I need to make sure that when I reboot the 8021q kernel module is loaded again. Should I be doing this through `/etc/sysconfig/modules` as instructed here or should I be doing this through `/etc/rc.modules` as instructed here? Or is there somewhere else I should be looking?

As for `Fedora`, both methods will work, there is no guarantee to chose which one is preferable.

For `Redhat/Centos`, you should use `/etc/sysconfig/modules`, since when it's documented in Redhat documentation - Persistent Module Loading.

Another way you can use `/etc/modules.conf` in `Redhat/Centos` base distro. If you use `Debian` base distro, use file `/etc/modules` file instead.