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Self-study IT network Linux load balancing video tutorial

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Course Introduction："Self-study IT Network Linux Load Balancing Video Tutorial" mainly implements Linux load balancing by performing script operations on web, lvs and Linux under nagin.

Shangxuetang MySQL video tutorial

Course Advanced 17561

Course Introduction："Shangxuetang MySQL Video Tutorial" introduces you to the process from installing to using the MySQL database, and introduces the specific operations of each link in detail.

Band of Brothers front-end example display video tutorial

Course Advanced 11273

Course Introduction："Brothers Band Front-end Example Display Video Tutorial" introduces examples of HTML5 and CSS3 technologies to everyone, so that everyone can become more proficient in using HTML5 and CSS3.

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Ways to fix issue 2003 (HY000): Unable to connect to MySQL server 'db_mysql:3306' (111)

I recently tried to containerize my FastAPIPython server (also for replication/doubling purposes). Before, I had just a MySQL server in a Docker container and everything was fine, but when I also made my web server a service, it couldn't connect to the MySQL server, so now the application doesn't work. Below is the code snippet of the server database initialization connector in the application fromfastapiimportFastAPIimportmysql.connectorapp

2023-09-05 11:18:47

Experiment with sorting after query limit

So this is my first question here, please forgive me if something is wrong. I'm trying to make a sort query based on constraints. So there is a Customers table with 90 records. I want to first perform a query limited to 3 records, and then sort the results of this query by a column called ContactName. I think this might be a nested query. Nested queries run fine in SQLServer, but don't know how to implement it in MySQL. Limit query: Select*fromcustomerslimit

2023-09-05 14:46:42

CSS Grid: Create new row when child content overflows column width

I have a two column layout based on CSS grid. When the content of the second column exceeds 1fr I want to create a new row. As it currently stands, the content simply overflows the column. One requirement of this layout is that the items in the right menu column are in one row. I achieve this with: .right-menu{...grid-auto-flow:columndense;...} If I remove the grid-auto-flow attribute, the overflow stops. However, the items are now stacked into multiple rows, which is not what I want. I also tried converting .ri

2023-09-05 15:18:28

PHP full text search functionality using AND, OR and NOT operators

Newbie question: I'm trying to implement a full text search on a search string using php and eloquent. $searchstring="+(victimsuspect)+crime-covid";$searchresult=RssItem::whereRaw("MATCH(description)AGAINST('$searchstring'INBOOLEANMODE)")->ge

2023-09-05 15:06:32

Shortest way to convert all PHP types to string

I'm writing a general system that I hope can one day be applied to fields like medicine (i.e. it's "scientific"). I think the best way is to represent all the data in php with strings (true will be "true", false will be "false" and so on). The reason for this is that in php any value has a unique string representation (such as the php code itself). I post this question to speed up the design process of this program. Some values are easily converted to strings: numbers, booleans, etc. Some are not easy: objects, arrays, resources. I think the transfer object and

2023-09-05 15:34:44

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An in-depth discussion of Linux driver technology (4)_The implementation principles and related technologies of asynchronous notification technology

Course Introduction：In the process of writing Linux drivers, asynchronous notification technology is a very important technology. It can achieve efficient event processing and data transmission, improving system performance and response speed. In this article, we will delve into the implementation principles and related technologies of Linux driver technology (4)_asynchronous notification technology. The full name of asynchronous notification is "signal-driven asynchronous IO". Through the "signal" method, when the resources expected to be obtained are available, the driver will actively notify the specified application, corresponding to the "signal" of the application layer. What is used here is Signal "SIGIO". The operation step is for the application layer program to register itself as a process driver that receives the SIGIO signal from the device file and implement the corresponding interface, in order to have the ability to receive this device from all registered devices.

2024-02-09 comment 0 1028

How to run jar files in Linux

Course Introduction：Prerequisites for running JAR files Running JAR files on a Linux system requires the installation of the Java Runtime Environment (JRE), which is the basic component required to execute Java applications, including the Java Virtual Machine (JVM), core class libraries, etc. Many mainstream Linux distributions, such as Ubuntu, Debian, Fedora, openSUSE, etc., provide software libraries of JRE packages to facilitate user installation. The following article will detail the steps to install JRE on popular distributions. After setting up the JRE, you can choose to use the command line terminal or the graphical user interface to start the JAR file according to your personal preference. Your choice may depend on familiarity with Linux shells and personal preference

2024-02-20 comment 0 836

How to clear the cache of Shen Yi Reading How to clear the cache of Shen Yi Reading

Course Introduction：As a popular e-reading application, Shenyi Reading supports us to read a wealth of book resources. During use, the accumulation of cached files may occupy a large amount of storage space and affect the running speed of the device. Therefore, learn how to clear Shenyi The cache of reading is particularly important. This article will introduce in detail the cache cleaning steps of Shenyi Reading to help users free up device storage space and improve the reading experience. Steps for clearing the cache of Shenyi Reading: 1. First open Shenyi Reading, enter the personal center page through the bottom menu bar, and click the settings button in the upper right corner; 2. Enter the settings page and click Clear Cache; 3. After the prompt pops up, click OK to clear it. .

2024-07-15 comment 0 249

How to enable recording in NVIDIA driver? What is the shortcut key for N card screen recording?

Course Introduction：How to enable recording in NVIDIA driver? Many users want to record the exciting game process when playing games. Using other software will affect the smoothness, and NVIDIA can record, but most people don’t know how to turn on the recording function and use the shortcut keys. In response to these problems, the editor of this issue will share the specific usage steps with the majority of users. I hope that today’s software tutorial can help everyone. How to enable NVIDIA recording Method 1. Automatic recording 1. Automatic recording and instant replay mode. Players can regard it as automatic recording mode. First open NVIDIA GeForce Experience. 2. After calling out the software menu using the Alt+Z keys, click on the bottom of Instant Replay

2024-08-28 comment 0 1115

React Query Database Plugin: Deep integration with container orchestration tools

Course Introduction：ReactQuery is a very popular data management library for managing and updating asynchronous data in React applications. It provides a simple and powerful way to process data, including querying, caching, prefetching and other functions. However, compared to traditional databases, ReactQuery does not communicate directly with the backend database. In order to solve this problem, we can use the ReactQuery database plug-in, which can be deeply integrated with container orchestration tools to achieve integration with back-end data.

2023-09-26 comment 0 1465

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