Udev

The udev application manages the device nodes in. It is triggered by the Linux kernel through uevents and uses a rule-based configuration to decide what actions to undertake when such a uevent has been fired.

== Using udev

=== Requirements

Most Gentoo Linux systems use udev for the device node management. As such, the requirements for udev are (most of the time) already fulfilled:


 * A Linux kernel 2.6.32 or higher
 * The CONFIG_INOTIFY_USER kernel setting

=== Installing udev

The package is part of most Gentoo Linux profiles' default set (called the system set), so should be installed automatically when you install Gentoo Linux.

However, if this isn't the case, you can always install it by simply emerging it.

Next, validate that the udev init script is automatically started at boot (through the sysinit runlevel):

Also check if the udev-postmount init script is started through the default runlevel: