How to prevent port scan in Linux
There are existing anti-port scanning tools on the Internet, such as psad and portsentry, but I find the configuration a bit cumbersome, and the server does not want to install additional software. So I...
Tagged: Linux
ExFAT file system driver for Linux is coming
After Microsoft opened up exFAT technology and actively added it to the Linux kernel, Linux Kernel 5.4 brought initial support for the exFAT file system . Now, based on earlier code improvements, the new...
How to prevent SYN flood attacks in Linux
SYN flooding attack refers to an attack method that uses the imperfect TCP/IP three-way handshake and maliciously sends a large number of packets that contain only the SYN handshake sequence. This kind of attack...
The Polish government increases its use of Linux
Some time ago, the South Korean government drafted a strategy to completely replace Windows 7 with a Linux-based open-source operating system to get rid of its dependence. Currently, the Polish social insurance company ZUS...
[Linux Basic] How to install & uninstall software on Linux
RPM package This kind of software package is like the EXE installation file of Windows. Various files have been compiled and packaged. Which file should be placed in which folder is specified. Installation is...
How to delete regularly expired files in Linux
When managing files under Linux, we usually have the need to periodically delete expired files. For example, periodically delete log files that exceed a specified time. Otherwise, the longer it takes, the more space...
How to configure secure SSH in Linux
This article will explain how to modify the default settings of sshd to ensure that sshd is secure and restricted to protect your server from hackers. You need to restart sshd every time you...
How to use scp command to transfer data between two Linux servers
When we manage the server or VPS, we often upload and download data. For example, when we need to move data from one server to another, we usually download the data from the first...
[Linux basic] Creating and deleting Linux directories
mkdir command The mkdir used to create one or more directories Example: Create directory: mkdir ddos The above command will create the directory ‘ddos’. Create a directory and set access permissions: mkdir -m 777...
Create archives and extract archive files with tar and gzip command
Create archives and extract archive files with tar and gzip command in Linux tar The tar command is used to create archives and extract archive files. Use Example Archive files or directories tar -cvf...
How to use the vi editor in Linux
The vi editor is a standard editor for all Unix and Linux systems. Its power is not inferior to any latest text editor. Here is a brief introduction to its usage and a small...
How to list directory contents in Linux
ls – list directory contents. List information about the FILEs (the current directory by default). Sort entries alphabetically if none of -cftuvSUX nor –sort is specified. How to list directory contents in Linux Use...
How to list contents of directories in a tree-like format in Linux
Tree is a recursive directory listing program that produces a depth indented listing of files, which is colorized ala dircolors if the LS_COLORS environment variable is set and output is to tty. With no...
Linux command to view user login information
On Linux, To display the currently logged-in user session, you can use the command: w 20:22:13 up 1:29, 1 user, load average: 0.00, 0.01, 0.00: the current system time and system running time, the...
View Linux process with ps command
ps – report a snapshot of the current processes ps displays information about a selection of the active processes. If you want a repetitive update of the selection and the displayed information, use top(1)...
How to view network status in Linux with ss utility
ss – another utility to investigate sockets. ss is used to dump socket statistics. It allows showing information similar to netstat. It can display more TCP and state informations than other tools. Use Example...
