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Firewalld Linux firewall

Firewalld Linux firewall

The firewall firewall firewalld service has two working modes: CLI and GUI. Compared with iptables, firewall supports dynamic updates and introduces the concept of zone. In short, a zone refers to a set of firewall policies predefined by the firewall, which allows these policies to be quickly switched between firewalls, thereby significantly improving the switching efficiency and application speed of the firewall. The zone default policy rule trusted allows all packets home to deny incoming traffic, but the ssh, mdns, ipp-client, and dhcpv6-client services are allowed to pass through the internal equivalent of the home zone work and deny incoming traffic, but

Feb 19, 2024 pm 06:24 PM
防火墙 client firewall 防火墙配置
Jtti: What are the commonly used Linux system security tips?

Jtti: What are the commonly used Linux system security tips?

Ensuring the security of Linux systems is one of the top priorities for system administrators and users. Here are some simple but effective Linux system security tips: 1. Update the system regularly: - Apply system updates and security patches in a timely manner to ensure that the system is not affected by known vulnerabilities. 2. Use strong passwords: - Force the use of complex, long passwords that contain numbers and special characters to avoid using passwords that are easy to guess. 3. Disable unnecessary services: - Close unnecessary network services and ports to reduce the attack surface of the system. 4. Firewall settings: - Use firewall configuration to limit inbound and outbound network traffic and only allow necessary services to pass. 5. Restrict user permissions: -Give users the minimum necessary

Feb 19, 2024 pm 03:40 PM
系统 linux 攻击面 加密通信 防火墙配置 敏感数据
Completely delete scanned harmful programs with one command

Completely delete scanned harmful programs with one command

Completely delete scanned harmful programs with one command Author: Tian Yi (formyz) An NFS server is shared by multiple Web projects. These directories include PHP programs, pictures, HTML pages, documents and attachments uploaded by users, etc. Because some web frameworks are old and do not perform strict security checks on uploaded files, although this NFS server is located in a protected internal network, a large number of malicious files are still uploaded by people with ulterior motives. The programmer was strongly requested to update the program (Discuz), and the reply was that the update was too difficult to handle on the program. From the system management level, the temporary measure is just to install the shadu software, scan the shared directory, and then delete these harmful files.

Feb 19, 2024 pm 01:57 PM
程序 nfs 上船
Tutorial on modifying the ssh port in Linux system.

Tutorial on modifying the ssh port in Linux system.

To modify the SSH port on a Linux system, you can follow these steps: Log in to the Linux system as the root user or a user with sudo privileges. Open the SSH configuration file. On most Linux distributions, the SSH configuration file is located at /etc/ssh/sshd_config. Open the configuration file using a text editor such as vi or nano, for example: sudovi/etc/ssh/sshd_config Look for the #Port line in the configuration file. # means a comment line, so to modify the port, you need to uncomment the line and change the port number. You can choose any unused port number as the new SSH port. For example, change the port number to 2

Feb 19, 2024 pm 01:00 PM
linux 配置文件 ssh
Linux network configuration and troubleshooting

Linux network configuration and troubleshooting

In today's era, the Internet has become an indispensable part of our lives and work. Network configuration and troubleshooting skills for Linux systems are crucial for every system administrator because Linux is the core of the network world. This article will lead readers to deeply explore the Linux network world, fully understand the basic concepts and methods of network configuration, and effectively solve network faults. Glossary: ​​Network interface: a hardware device used to connect a computer to a network, such as an Ethernet card, a wireless network card, etc. In Linux, each network interface has a unique name, such as eth0, wlan0, etc. IP address: A numerical address that uniquely identifies a device on the Internet. Subnet mask: Used to divide the network part and main part of the IP address.

Feb 19, 2024 am 11:18 AM
网络 linux 地址 网络问题
How to connect and use WinSCP

How to connect and use WinSCP

WinSCP is an open source file upload client based on SSH under Windows system environment. It is easy to operate and can be operated by dragging and dropping. At the same time, it also supports batch script and command line operations. It supports multiple encryption methods and has a built-in text editor for convenience. User operation, users only need to connect to the corresponding winscp server to download and transfer files. Let’s see how to use it. How to connect and use WinSCP 1. First open the software and enter the host’s IP, username, and password, and click Save. The file protocol defaults to SFTP connection, and the port number is generally 22. If you have not changed the port yourself, WinSCP can also be used as an FTP tool. Just select FTP from the file protocol drop-down menu. 2. Next

Feb 19, 2024 am 10:12 AM
Can a virtual machine change mac?

Can a virtual machine change mac?

Preface: In this article, this site will introduce to you the relevant content about how virtual machines can change mac. I hope it will be helpful to you, let's take a look. How to modify the mac address of vmware virtual machine in win7 system? First, open the virtual machine on the computer, enter the main page, and click the "File" option in the upper left corner. In the pop-up menu, select the "Open" option. Next, find the virtual machine whose MAC address needs to be modified in the window that opens, and click the "Open" button at the bottom. One method is to use the Win7 MAC address modification tool to change the MAC address of the network card in the Windows 7 system. Please note that this tool may not work with all wireless cards, so use it with caution. XP system can also try to use

Feb 19, 2024 am 10:10 AM
mac xp系统 win7系统
What kind of network service is the ftp service also called?

What kind of network service is the ftp service also called?

The FTP service refers to the File Transfer Protocol (FileTransferProtocol) service, which is a common service used for file transfer on the network. The FTP service allows users to upload and download files through a connection between a client and a server. Through the FTP service, users can share files between different computers and transfer files quickly and easily. In addition to FTP service, it also has some other names, let’s take a look at them. Anonymous FTP service (Anonymo

Feb 18, 2024 pm 07:24 PM
安全传输
Detailed explanation of how Ansible works

Detailed explanation of how Ansible works

The working principle of Ansible can be understood from the above figure: the management end supports three methods of local, ssh, and zeromq to connect to the managed end. The default is to use the ssh-based connection. This part corresponds to the connection module in the above architecture diagram; you can press the application type HostInventory (host list) classification is carried out in other ways. The management node implements corresponding operations through various modules. A single module and batch execution of a single command can be called ad-hoc; the management node can implement a collection of multiple tasks through playbooks. Implement a type of functions, such as installation and deployment of web services, batch backup of database servers, etc. We can simply understand playbooks as, the system passes

Feb 18, 2024 pm 05:40 PM
模块 ssh ansible
What are the commonly used shell scripts in Linux?

What are the commonly used shell scripts in Linux?

1. Check the consistency of files in the specified directories of the two servers #!/bin/bash############################## #######Check the consistency of files in the specified directories of the two servers################################ ######By comparing the md5 values ​​of the files on the two servers, the purpose of detecting consistency is achieved. dir=/data/webb_ip=192.168.88.10# Traverse all the files in the specified directory and use them as parameters of the md5sum command. Then get the md5 value of all files and write it to the specified file find$dir-typ

Feb 18, 2024 pm 05:36 PM
文件 md dir shell脚本 自动重启
Ansible way to connect to the controlled terminal

Ansible way to connect to the controlled terminal

ssh key#Generate the secret key ssh-keygen#Copy the key to the managed server ssh-copy-id-i~/.ssh/id_rsa.pub-p22root@192.168.182.130Account password 1. Command line configuration#- k: interactive ansible-uroot-k192.168.182.130-mping2, configuration in configuration file #Default host configuration file: /etc/ansible/hosts192.168.182.130ansible_ssh_user=rootansible_ssh_pass=123456[web]192.168

Feb 18, 2024 pm 04:51 PM
ssh ansible
How to deploy Trojan agent on cloud server?

How to deploy Trojan agent on cloud server?

To deploy a Trojan agent on a cloud server, you can follow these steps: First, make sure you have an available cloud server and that you are able to connect to the server via SSH. Log in to your cloud server using SSH. You can use a command line tool similar to the following: sshusername@server_ip_address where username is your server username and server_ip_address is the IP address of your server. Install Trojan agent on the server. You can follow the following steps: a. Add Trojan's package repository. Run the following command: sudoadd-apt-reposi

Feb 18, 2024 pm 04:51 PM
服务器 ssh trojan
150 common commands you must know in Linux operation and maintenance

150 common commands you must know in Linux operation and maintenance

Linux commands are the core of Linux system management, similar to DOS commands. There are two types of commands in Linux systems: built-in Shell commands and Linux commands. These commands manage the CPU, memory, disk drives, etc., and are necessary for the normal operation of the system. Command function description Online query and help commands (2) man View command help, command dictionary, and more complex info, but it is not commonly used. help View help for Linux built-in commands, such as the cd command. File and directory operation commands (18) ls spells out list. Its function is to list the contents of the directory and its content attribute information. cd spells out changedirectory, the function is to change from the current working directory

Feb 18, 2024 pm 04:48 PM
linux 命令 全拼 格式化输出
Network communication protocol-TCP protocol explained in detail!

Network communication protocol-TCP protocol explained in detail!

TCP (TransmissionControlProtocol) is a reliable transport layer protocol that ensures the orderly transmission and complete reception of data. TCP provides a connection-oriented communication method, using a three-way handshake to establish a connection, and manages data transmission through flow control and congestion control. The TCP protocol also supports two-way communication and data verification to ensure that data will not be lost or damaged during transmission. The TCP protocol plays an important role in Internet communications, providing the basis for reliable communication between applications. Characteristics of TCP: Reliability: TCP uses acknowledgment and retransmission mechanisms to ensure reliable transmission of data. The receiver will send a confirmation message to the sender to inform that the data has been received. If the sender does not receive the confirmation message,

Feb 18, 2024 pm 04:40 PM
tcp 发送 接受

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