Provided by: module-init-tools_3.12-1ubuntu2_i386
modprobe.d, modprobe.conf - Configuration directory/file for modprobe
Because the modprobe command can add or remove more than one module,
due to modules having dependencies, we need a method of specifying what
options are to be used with those modules. All files underneath the
/etc/modprobe.d directory which end with the .conf extension specify
those options as required. (the /etc/modprobe.conf file can also be
used if it exists, but that will be removed in a future version). They
can also be used to create convenient aliases: alternate names for a
module, or they can override the normal modprobe behavior altogether
for those with special requirements (such as inserting more than one
Note that module and alias names (like other module names) can have -
or _ in them: both are interchangable throughout all the module
commands as underscore conversion happens automatically.
The format of and files under modprobe.d and /etc/modprobe.conf is
simple: one command per line, with blank lines and lines starting with
'#' ignored (useful for adding comments). A '\' at the end of a line
causes it to continue on the next line, which makes the file a bit
alias wildcard modulename
This allows you to give alternate names for a module. For
example: "alias my-mod really_long_modulename" means you can use
"modprobe my-mod" instead of "modprobe really_long_modulename".
You can also use shell-style wildcards, so "alias my-mod*
really_long_modulename" means that "modprobe my-mod-something"
has the same effect. You can't have aliases to other aliases
(that way lies madness), but aliases can have options, which
will be added to any other options.
Note that modules can also contain their own aliases, which you
can see using modinfo. These aliases are used as a last resort
(ie. if there is no real module, install, remove, or alias
command in the configuration).
Modules can contain their own aliases: usually these are aliases
describing the devices they support, such as "pci:123...". These
"internal" aliases can be overridden by normal "alias" keywords,
but there are cases where two or more modules both support the
same devices, or a module invalidly claims to support a device
that it does not: the blacklist keyword indicates that all of
that particular module's internal aliases are to be ignored.
install modulename command...
This command instructs modprobe to run your command instead of
inserting the module in the kernel as normal. The command can
be any shell command: this allows you to do any kind of complex
processing you might wish. For example, if the module "fred"
works better with the module "barney" already installed (but it
doesn't depend on it, so modprobe won't automatically load it),
you could say "install fred /sbin/modprobe barney;
/sbin/modprobe --ignore-install fred", which would do what you
wanted. Note the --ignore-install, which stops the second
modprobe from running the same install command again. See also
The long term future of this command as a solution to the
problem of providing additional module dependencies is not
assured and it is intended to replace this command with a
warning about its eventual removal or deprecation at some point
in a future release. Its use complicates the automated
determination of module dependencies by distribution utilities,
such as mkinitrd (because these now need to somehow interpret
what the install commands might be doing. In a perfect world,
modules would provide all dependency information without the use
of this command and work is underway to implement soft
dependency support within the Linux kernel.
If you use the string "$CMDLINE_OPTS" in the command, it will be
replaced by any options specified on the modprobe command line.
This can be useful because users expect "modprobe fred opt=1" to
pass the "opt=1" arg to the module, even if there's an install
command in the configuration file. So our above example becomes
"install fred /sbin/modprobe barney; /sbin/modprobe --ignore-
install fred $CMDLINE_OPTS"
options modulename option...
This command allows you to add options to the module modulename
(which might be an alias) every time it is inserted into the
kernel: whether directly (using modprobe modulename or because
the module being inserted depends on this module.
All options are added together: they can come from an option for
the module itself, for an alias, and on the command line.
remove modulename command...
This is similar to the install command above, except it is
invoked when "modprobe -r" is run.
softdep modulename pre: modules... post: modules...
The softdep command allows you to specify soft, or optional,
module dependencies. modulename can be used without these
optional modules installed, but usually with some features
missing. For example, a driver for a storage HBA might require
another module be loaded in order to use management features.
pre-deps and post-deps modules are lists of names and/or aliases
of other modules that modprobe will attempt to install (or
remove) in order before and after the main module given in the
Example: Assume "softdep c pre: a b post: d e" is provided in
the configuration. Running "modprobe c" is now equivalent to
"modprobe a b c d e" without the softdep. Flags such as --use-
blacklist are applied to all the specified modules, while module
parameters only apply to module c.
Note: if there are install or remove commands with the same
modulename argument, softdep takes precedence.
A future version of module-init-tools will come with a strong warning
to avoid use of the install as explained above. This will happen once
support for soft dependencies in the kernel is complete. That support
will complement the existing softdep support within this utility by
providing such dependencies directly within the modules.
This manual page originally Copyright 2004, Rusty Russell, IBM
Corporation. Maintained by Jon Masters and others.