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31.3. Loading a Module
To load a kernel module, run the
modprobe <module_name>
command as root. For example, to load the wacom
module, run:
~]# modprobe wacom
By default,
modprobe
attempts to load the module from the /lib/modules/<kernel_version>/kernel/drivers/
directory. In this directory, each type of module has its own subdirectory, such as net/
and scsi/
, for network and SCSI interface drivers respectively.
Some modules have dependencies, which are other kernel modules that must be loaded before the module in question can be loaded. A list of module dependencies is generated and maintained by the depmod program that is run automatically whenever a kernel or driver package is installed on the system. The depmod program keeps the list of dependencies in the
/lib/modules/<kernel_version>/modules.dep
file. The modprobe
command always reads the modules.dep
file when performing operations. When you ask modprobe
to load a specific kernel module, it first examines the dependencies of that module, if there are any, and loads them if they are not already loaded into the kernel. modprobe
resolves dependencies recursively: If necessary, it loads all dependencies of dependencies, and so on, thus ensuring that all dependencies are always met.
You can use the
-v
(or --verbose
) option to cause modprobe
to display detailed information about what it is doing, which may include loading module dependencies. The following is an example of loading the Fibre Channel over Ethernet
module verbosely:
Example 31.3. modprobe -v shows module dependencies as they are loaded
~]# modprobe -v fcoe
insmod /lib/modules/2.6.32-71.el6.x86_64/kernel/drivers/scsi/scsi_tgt.ko
insmod /lib/modules/2.6.32-71.el6.x86_64/kernel/drivers/scsi/scsi_transport_fc.ko
insmod /lib/modules/2.6.32-71.el6.x86_64/kernel/drivers/scsi/libfc/libfc.ko
insmod /lib/modules/2.6.32-71.el6.x86_64/kernel/drivers/scsi/fcoe/libfcoe.ko
insmod /lib/modules/2.6.32-71.el6.x86_64/kernel/drivers/scsi/fcoe/fcoe.ko
This example shows that
modprobe
loaded the scsi_tgt
, scsi_transport_fc
, libfc
and libfcoe
modules as dependencies before finally loading fcoe
. Also note that modprobe
used the more “primitive” insmod
command to insert the modules into the running kernel.
Important
Although the
insmod
command can also be used to load kernel modules, it does not resolve dependencies. Because of this, you should always load modules using modprobe
instead.