Kernel modules are usually loaded directly by the facility that requires
them, which is given correct settings in the
/etc/modprobe.conf file. However, it is sometimes
necessary to explicitly force the loading of a module at boot time.
Red Hat Enterprise Linux checks for the existence of the /etc/rc.modules
file at boot time, which contains various commands to load modules. The
rc.modules should be used, and not
rc.local because rc.modules is
executed earlier in the boot process.
For example, the following commands configure loading of the
foo module at boot time (as root):
# echo modprobe foo >> /etc/rc.modules
# chmod +x /etc/rc.modules
This approach is not necessary for network and SCSI interfaces
because they have their own specific mechanisms.