Virmach's Black Friday machines appear and disappear rapidly. For hosting enthusiasts, constantly checking current VPS prices and deciding whether to buy is troublesome. This article lists Black Friday machine configurations using sklearn and predicts VPS prices with machine learning to alert users if prices are cheap.

During the recent Black Friday sales, I grabbed a special machine from Virmach, so I thought of testing its performance by running some VPS performance and network tests since the machine looks pretty good.

How to batch replace strings in Linux? At first, I thought about using sed with -r or some iterative method, but found sed doesn't support iteration parameters. So, I use find to get files and sed to replace strings.

During Linux system development, sometimes your program might crash or be stopped. To keep it running continuously, adding the program to the service list is a very good practice.

I often play Sudoku in my leisure time as a form of relaxation. My usual method involves eliminating duplicates and filling in unique numbers first, then proceeding step by step. However, it's inevitable to guess numbers and adjust based on feedback. So, is there a better algorithm to solve Sudoku puzzles? Here, I will use the backtracking method in Python to solve 9x9 expert-level Sudoku puzzles.

I recently set up a CentOS 8 virtual machine to experience the latest CentOS system, allocating 127GB of space. Due to actual needs, I found that the /home partition had tens of gigabytes of space.

Both China Telecom and CERNET support IPv6, but router configurations often go wrong. This article explains how to set up a K2 router with Padavan firmware to ensure all hosts under the router have IPv6.

My blog used the lnmp program to build the web environment, but when I needed to use mysql, I found that the lnmp installation log file was missing and the mysql root password was forgotten. I remember that the lnmp was installed by pressing Enter all the way, and the default lnmp password is lnmp.org# plus 5 random numbers, with only 100,000 possibilities. In this case, brute-forcing 100,000 times will definitely find the password.

Today I logged into the server and found records of SSH brute force attacks, so I thought I might as well record the hacker's passwords and try logging into his server in reverse.

Sometimes you may need to temporarily store data so that it can be called directly the next time the program runs, or exchanged between different threads. Serialization is a way to store data in this way, and here we explain Python's serialization and deserialization using the pickle package.