


An in-depth discussion of the three working modes of SELinux
Detailed explanation of the three working modes of SELinux
SELinux is a mandatory access control (MAC) technology designed to enhance the security of Linux systems. It uses tags to mark resources in the system (such as files, processes, and ports) and defines policies to control process access to these resources. In SELinux, there are three main working modes: forced mode, elastic mode and harmless mode. This article will introduce these three working modes in detail and provide specific code examples.
- Enforcing Mode
In enforcing mode, SELinux will enforce the predefined access policy. If the process attempts to access unauthorized resources, the access will be blocked. is rejected and logged in the audit log. In this mode, the SELinux protection mechanism cannot be bypassed even if the system administrator wishes. Administrators need to configure and customize policies based on actual needs.
Code example:
In enforcement mode, you can check the status of SELinux through the following command:
sestatus
- Permissive Mode
In elastic mode, SELinux will also execute the predefined access policy, but will not deny any access and will not record it in the audit log. This mode can be used to test policies to understand which access will be denied in order to adjust the SELinux configuration. Administrators can make policy adjustments while keeping the system running.
Code example:
In elastic mode, you can check the status of SELinux through the following command:
sestatus
- Harmless Mode (Disabled Mode)
In harmless mode, SELinux will be completely disabled and the system will return to the traditional Unix permission control mode. Access control in the system relies entirely on file permissions and user permissions and is no longer protected by SELinux. This mode is suitable for environments with low system security requirements, but is not recommended for use in production environments.
Code example:
In harmless mode, you can check the status of SELinux through the following command:
sestatus
Summary:
In actual applications, according to the system Requirements and security level, you can choose the appropriate SELinux working mode. Enforcement mode provides the highest level of security, but requires careful configuration of policies; elastic mode can help administrators understand system access and adjust policies; harmless mode simplifies the complexity of system management to the greatest extent, but sacrifices certain security. Administrators should choose the appropriate working mode based on the actual situation and perform necessary configuration and monitoring to ensure system safety and reliability.
The above is a detailed explanation of the three working modes of SELinux. I hope it will be helpful to readers.
The above is the detailed content of An in-depth discussion of the three working modes of SELinux. For more information, please follow other related articles on the PHP Chinese website!

MaintenanceModeinLinuxisaspecialbootenvironmentforcriticalsystemmaintenancetasks.Itallowsadministratorstoperformtaskslikeresettingpasswords,repairingfilesystems,andrecoveringfrombootfailuresinaminimalenvironment.ToenterMaintenanceMode,interrupttheboo

The core components of Linux include kernel, file system, shell, user and kernel space, device drivers, and performance optimization and best practices. 1) The kernel is the core of the system, managing hardware, memory and processes. 2) The file system organizes data and supports multiple types such as ext4, Btrfs and XFS. 3) Shell is the command center for users to interact with the system and supports scripting. 4) Separate user space from kernel space to ensure system stability. 5) The device driver connects the hardware to the operating system. 6) Performance optimization includes tuning system configuration and following best practices.

The five basic components of the Linux system are: 1. Kernel, 2. System library, 3. System utilities, 4. Graphical user interface, 5. Applications. The kernel manages hardware resources, the system library provides precompiled functions, system utilities are used for system management, the GUI provides visual interaction, and applications use these components to implement functions.

Linux maintenance mode can be entered through the GRUB menu. The specific steps are: 1) Select the kernel in the GRUB menu and press 'e' to edit, 2) Add 'single' or '1' at the end of the 'linux' line, 3) Press Ctrl X to start. Maintenance mode provides a secure environment for tasks such as system repair, password reset and system upgrade.

The steps to enter Linux recovery mode are: 1. Restart the system and press the specific key to enter the GRUB menu; 2. Select the option with (recoverymode); 3. Select the operation in the recovery mode menu, such as fsck or root. Recovery mode allows you to start the system in single-user mode, perform file system checks and repairs, edit configuration files, and other operations to help solve system problems.

The core components of Linux include the kernel, file system, shell and common tools. 1. The kernel manages hardware resources and provides basic services. 2. The file system organizes and stores data. 3. Shell is the interface for users to interact with the system. 4. Common tools help complete daily tasks.

The basic structure of Linux includes the kernel, file system, and shell. 1) Kernel management hardware resources and use uname-r to view the version. 2) The EXT4 file system supports large files and logs and is created using mkfs.ext4. 3) Shell provides command line interaction such as Bash, and lists files using ls-l.

The key steps in Linux system management and maintenance include: 1) Master the basic knowledge, such as file system structure and user management; 2) Carry out system monitoring and resource management, use top, htop and other tools; 3) Use system logs to troubleshoot, use journalctl and other tools; 4) Write automated scripts and task scheduling, use cron tools; 5) implement security management and protection, configure firewalls through iptables; 6) Carry out performance optimization and best practices, adjust kernel parameters and develop good habits.


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

Dreamweaver Mac version
Visual web development tools

ZendStudio 13.5.1 Mac
Powerful PHP integrated development environment

SAP NetWeaver Server Adapter for Eclipse
Integrate Eclipse with SAP NetWeaver application server.

DVWA
Damn Vulnerable Web App (DVWA) is a PHP/MySQL web application that is very vulnerable. Its main goals are to be an aid for security professionals to test their skills and tools in a legal environment, to help web developers better understand the process of securing web applications, and to help teachers/students teach/learn in a classroom environment Web application security. The goal of DVWA is to practice some of the most common web vulnerabilities through a simple and straightforward interface, with varying degrees of difficulty. Please note that this software