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as they are needed Kernel module loading support must also be enabled in the kernel, though this is usually considered part of a standard configuration In addition, several tools enable you to load and unload modules manually, if you must The Kernel Module Loader uses certain kernel commands to perform the task of loading or unloading modules The modprobe command is a general-purpose command that calls insmod to load modules and rmmod to unload them These commands are listed in Table 31-9 Options for particular modules, general configuration, and even specific module loading can specified in the /etc/ modprobeconf file You can use this file to automatically load and configure modules You can also specify modules to be loaded at the boot prompt or in grubconf
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PART VII PART I PART I PART I PART I PART I PART I
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Module Files and Directories: /lib/modules
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The filename for a module has the extension o Kernel modules reside in the /lib/modules/ version directory, where version is the version number for your current kernel with the extension FC7 The directory for the 2620-12054_FC7 kernel is /lib/modules/2620-12054_ FC5 As you install new kernels on your system, new module directories are generated for them One method to access the directory for the current kernel is to use the uname -r command to generate the kernel version number This command needs to have back quotes
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cd /lib/modules/`uname -r`
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In this directory, modules for the kernel reside in the /kernel directory Within the /kernel directory are several subdirectories, including the /drivers directory that holds subdirectories for modules like sound drivers or video drivers These subdirectories serve to categorize your modules, making them easier to locate For example, the kernel/drivers/net directory holds modules for your Ethernet cards, and the kernel/drivers/sound directory contains sound card modules
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TIP You will notice that there are no entries for the Ethernet devices in the /dev file, such as eth0 or
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eth1 That is because these are really aliases for kernel modules defined in the /etc/modprobe conf file, or devices handled by the kernel directly They are not device files
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Command lsmod insmod rmmod modinfo depmod modprobe
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Description Lists modules currently loaded Loads a module into the kernel Does not check for dependencies Unloads a module currently loaded Does not check for dependencies Displays information about a module: -a (author),-d (description), -p (module parameters), -f (module filename), -v (module version) Creates a dependency file listing all other modules on which the specified module may rely Loads a module with any dependent modules it may also need Uses the file of dependency listings generated by depmod: -r (unload a module), -l (list modules)
TABLE 31-9 Kernel Module Commands
Part VII:
System Administration
Managing Modules with modprobe
As noted previously, there are several commands you can use to manage modules The lsmod command lists the modules currently loaded into your kernel, and modinfo provides information about particular modules Though you can use the insmod and rmmod commands to load or unload modules directly, you should use only modprobe for these tasks Often, however, a given module requires other modules to be loaded For example, the module for the Sound Blaster sound card, sbo, requires the soundo module to be loaded also
The depmod Command
Instead of manually trying to determine what modules a given module depends on, you use the depmod command to detect the dependencies for you The depmod command generates a file that lists all the modules on which a given module depends The depmod command generates a hierarchical listing, noting what modules should be loaded first and in what order Then, to load the module, you use the modprobe command using that file modprobe reads the file generated by depmod and loads any dependent modules in the correct order, along with the module you want You need to execute depmod with the -a option once, before you ever use modprobe Entering depmod -a creates a complete listing of all module dependencies This command creates a file called modulesdep in the module directory for your current kernel version, /lib/modules/version
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