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Centos 7 binary installation and configuration MariaDB database

Since each company's database server version is different, I still recommend everyone to use the Mariadb database. At least for now, the community and products are very stable. As for any new features, it is recommended to go to its official website to learn more about the features. Check the system version command $cat/etc/redhat-releaseCentOSLinuxrelease7.4.1708(Core)x64 Install MariaDB (MySQL) Download the MariaDB binary installation package: https://downloads.mariadb.org Unzip and install the Mariadb-devel static library: $yuminstallmariadb- develn

Jul 19, 2024 am 02:20 AM

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Detailed introduction and usage of code implementation of forwarding server and proxy server

The code was written after work. The code is divided into forwarding server and proxy server. Let’s talk about the forwarding server first. Although the forwarding server can also be said to be a redirection server, Linux uses a proxy server. For example, the forwarding server eavesdrops on port 80. If a browser user accesses the server IP (browser requests port 80 by default), after the forwarding server receives the browser user's request, it redirects the browser user's request to other ports on this machine or to designated ports on other machines on the same public network. Let's talk about the proxy. Let me explain the server first. My proxy server can only proxy designated websites or other customers who can proxy, such as SVN services built on the external network or intranets that are inaccessible in some places.

Jul 19, 2024 am 02:17 AM

How to run stable diffusion using school high-performance GPU without root access and network

As we all know, stablediffusion usually cannot be driven by laptop GPUs. It is said that at least 4GB of GPUVRAM is needed, but it is not enough if you want to use it at "normal speed (1)". Want to use the cloud? Some cloudgpu rental prices are acceptable, and they usually don't allow you to store files. Opening a cloud storage is another expense, and it's troublesome to transfer files to and from them. So I (mainly my tutor) decided to use the GPU from the middle school in order to save money. (1) Approximate reference regardless of GPU model speed: My GPU2GB: 3 minutes for one picture. Linux uses a proxy server for Linux system programming. Friends AGPU6GB: 50 seconds for one picture. Friends BGPU32GB: 2S for one picture.

Jul 19, 2024 am 12:30 AM

How to end a process under Linux: Detailed explanation of normal and abnormal termination

In the first two chapters, we learned about creating processes. In this chapter, we will learn how to end the process under Linux. In Linux, there are 3 ways to end the process normally and 2 ways to terminate abnormally: 1. Normal end: a. Call return in the main function. This is equivalent to calling exit. b. Call the exit function. According to the definition of this function in ANSIC, when called, all registered exit handles will be executed, all standard I/O streams will be closed, and file descriptors and multi-processes (parent processes and subprocess), jobs, etc., so it is not sound for Linux systems. c. Call the _exit function. exit is called by _exit, turn off some li

Jul 18, 2024 pm 10:11 PM

Mariadb learning summary (4): data insertion, deletion and modification

INSERT insert data INSERT statement format: INSERT[LOW_PRIORITY|DELAYED|HIGH_PRIORITY][IGNORE][INTO]tbl_name[PARTITION(partition_list)][(col,...)]{VALUES|VALUE}({expr|DEFAULT},. ..),(...),...[ONDUPLICATEKEYUPDATEcol=expr[,col=expr]...]The table structure is as follows: MariaDB[mydb]>DESCuser;+------

Jul 18, 2024 pm 07:06 PM

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How to adjust the maximum number of socket connection limits for web servers and cache servers under high concurrency

Web server and cache server, under high concurrency, adjust the limit of the maximum number of socket connections: 1. Change the limit of the maximum number of files that a user process can open. Effective immediately: ulimit-nxxx takes permanent effect: echo "ulimit-HSn65536">>/etc/rc.localecho "ulimit-HSn65536">>/root/.bash_profileulimit-HSn655362, changes the limit of the maximum number of TCP connections by the network kernel. /etc/sysctl.conf 1. On the Linux platform,

Jul 18, 2024 pm 06:44 PM

Centos7 default firewalld firewall command

Basic operations; #systemctlstartfirewalld//Start #systemctlstatusfirewalld//Status #systemctldisablefirewalld//Disable #systemctlstopfirewalld//Stop systemctl is an indispensable management tool in centos7. It has all the functions of service and chkconfig; #systemctlstartfirewalld.service//Start A certain service #systemctlstopfirewalld.service//Close a certain service

Jul 18, 2024 pm 06:08 PM

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Linux uniq command example

Note that uniq will not remove duplicate rows unless they are adjacent. Therefore, you may need to sort them first, or combine the sort command with uniq to get the results. Let me show you some examples. First, let's create a file with some repeated lines: viostechnix.txtwelcometoostechnixwelcometoostechnixLinuxisthecreatorofLinux.LinuxissecurebydefaultLinuxisthecreatorofLinux.Top500supercomputersarepoweredbyL

Jul 18, 2024 pm 04:17 PM

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The importance of timer components in the game business and how to implement them

Timer is a relatively common component. As far as the server is concerned, the framework level needs to use timers to time out sessions, and the application level needs to use timers to handle some time-related business logic. For businesses such as games that require a large number of timers, a simple and efficient timer component is essential. The implementation of the timer component can be divided into two parts: the first part is relatively simple and has various implementation methods, but it is basically related to the language, so it is not the focus of this article. The so-called concrete concept seems to refer to how users use it. [Article Benefits] The editor has uploaded some learning books and video materials that I think are better in the group file. If necessary, you can join the group [977878001] to receive them! ! ! Comes with an extra

Jul 18, 2024 am 11:17 AM

A closer look at Linux kernel timers: interrupt-based asynchronous mechanisms and non-process context principles

1. Kernel timer 1. Basic concept In certain scenarios, we need to perform certain actions after a specific time, and we do not want to waste CPU by waiting. This timer is a very suitable mechanism. A timer is used to execute a function at a certain point in the future to complete a specific task. Kernel timers tell the kernel to call a specific function with specific parameters at a specified point in time. The timer runs asynchronously on its registrant. When the timer is running, the task that registered the timer may be sleeping or running on other processors, or may even have exited long ago. The kernel timer in Linux is a Linux application timer implemented based on (soft) interrupts, that is, it is in the interrupt context rather than the process context. There are some primitives in non-process contexts

Jul 18, 2024 am 11:13 AM

Online course selection management system based on SSM framework: a powerful tool to improve the efficiency of educational administration management in colleges and universities

Other projects: Design and implementation of seismic data processing software based on Linux, click on the author's homepage Catalog 1 System Introduction With the development of the information age, design and implementation of seismic data processing software based on Linux, the Internet has made people's lives more and more convenient. In recent years, in the face of the new enrollment expansion policies of major colleges and universities, the number of middle school students in various colleges and universities has suddenly increased, and the corresponding school academic staff will also face a shortage. This has reduced the difficulty for academic staff in managing the course selection information of middle school students. , the traditional course selection in previous years was gradually eliminated because it was a waste of manpower and material resources. At this time, the emergence of the online course selection management system will promote the increasingly standardized course selection management behavior of middle schools, thereby greatly reducing the casualness of middle school course selection management in previous years and greatly improving the efficiency of course selection management.

Jul 18, 2024 am 10:10 AM

What should I do if Linux scheduled tasks are not executed? This article teaches you how to troubleshoot

The implementation of Linux scheduled tasks includes: cron, anacron, at, etc., but what you come into contact with in your daily work is the cron service. cron is the service name, crond is the background process, and crontab is the customized scheduled task list. Scheduled tasks are often used in projects to implement individual functions. Recently, I encountered a situation where scheduled tasks were not executed. Because I didn’t know much about this before, it was time-consuming and laborious, and I finally found the problem. For this reason, I would like to share with you some troubleshooting techniques to avoid detours in the future. 1. Check whether the crond service is executed. You can view the process pid of crond through the command pgrepcrond or /sbin/servicecrondstatus, and you can determine the cron

Jul 18, 2024 am 10:09 AM

The role of common Linux commands in development and debugging and introduction to sample programs

Some of the commonly used Linux commands can be very helpful during the development or debugging process. Some can help us understand or optimize our programs, and some can help us locate difficult problems.

Jul 18, 2024 am 09:51 AM

Mariadb learning summary (3): data types

Data type Data type -> is an abstraction of a data classification with the same attributes and properties. For example: a string is a string composed of characters, which is called a string... In computers, substrings can be divided and new characters can be added at the end of the string. However, such operations can only operate on string data. It cannot operate on integers. Numeric type, the Arabic numerals we are most exposed to, can perform arithmetic operations, logical operations and other operations. The data types in MySQL MySQL supports multiple types, which can be roughly divided into three categories: numerical, date/time and string (character) types. . Numeric type 1. For integer types, you can limit their length. The format is as follows: Integer type [(M)][SIGNED|UNSIGNED|

Jul 18, 2024 am 08:15 AM

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