Steps and configuration methods for installing udev on CentOS

php editor Youzi will introduce you to the steps and configuration methods of installing udev on CentOS. udev is a device manager used to dynamically create device nodes in Linux systems. Installing udev on CentOS can help us better manage devices and drivers. The steps to install udev are very simple. First, you need to install the udev package through the yum command, and then make relevant settings in the configuration file. Next, we will introduce in detail the steps and configuration methods of installing udev to help you better use the CentOS system.

#udev is a device management tool in the Linux kernel. It is responsible for automatically identifying and configuring hardware devices when the Linux system starts. udev can configure the device according to the attributes and rules of the device. The device allocates a unique device node and loads the corresponding driver as needed. In CentOS, udev is also an important component. It can automatically identify newly added hardware devices and assign device nodes to them.

1. Open the terminal and log in to the CentOS system as the root user.

2. Use the following command to install udev:

```

yum install udev

This will automatically download and install the udev package and its dependencies item.

Configuring udev can be completed by editing the udev configuration file. The udev configuration file is located in the `/etc/udev/` directory and mainly includes the following two files:

1. `udev .conf`: This file contains the global configuration options of udev. You can modify the global configuration of udev by editing this file, such as setting the default device node permissions, setting rules for loading drivers, etc.

2. `rules.d/` directory: This directory contains a series of rule files with the suffix `.rules`. These rule files define how udev identifies and configures the device. You can edit these rule files To modify udev's device identification and configuration rules.

2. Use a text editor to open the `/etc/udev/udev.conf` file:

vi /etc/udev/udev.conf

3. As needed Modify configuration options, such as setting the default device node permissions:

#Default device node permissions

MODE="0666"

This will set the default device node permissions to 0666, that is, all users have read and write permissions.

4. Save the file and exit the editor.

2. Use a text editor to open the rules file in the `/etc/udev/rules.d/` directory, for example `/etc/udev/rules.d/10-local.rules`:

vi /etc/udev/rules.d/10-local.rules

3. Add or modify rules as needed, for example, add a rule to identify and configure a USB device:

# USB Device Rules

SUBSYSTEM=="usb", ATTR{idVendor}=="1234", ATTR{idProduct}=="5678", MODE="0666"

This will set the device node permissions to 0666 when a USB device with idVendor 1234 and idProduct 5678 is plugged in.

2. Use the following command to restart the udev service:

systemctl restart udev

This will make the new udev configuration take effect.

CentOS udev installation and configuration has been completed.

In Linux systems, you can use the `lsusb` command to list all devices connected to the USB bus. This command can help us view the detailed information of the USB device, such as the manufacturer ID and product ID of the device, etc. , use the `lsusb -v` command to display more detailed device information.

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