Programmer Group

Based on business problems, redis was added to the project for caching and queuing. But now we just install and deploy on a single server, without purchasing other services like Ali Cloud, and without building master and slave. This leads to problems. If the redis process is accidentally blocked, then the business can not be carried out. This ...

Catalog 1. Use of temporary documents 1.1 Reorientation using shell 1.2 freopen standard output to file 2. Use anonymous pipes 3. Use popen 4. Summary 1. Use of temporary documents 1.1 Reorientation using shell The first idea is to redirect the command output to a temporary file, read the t ...

- Restore content to start brief introduction Previous demonstrations have shown that placing all request processing logic in the closure function of the routing file is obviously unreasonable. We need to use the controller class to organize and manage relatively complex business logic processing. Controllers are used to encapsulate related H ...

The original is published on a personal site: GitDiG.com , link to the original text: 9102, Play Mail System Again: Installation This article was originally intended to be written in the middle of a series of articles about the mail system in 9102, but it was the first to do so.This series will include the following three articles: [] 9102, P ...

MongoDB Index Why use index? Assuming there is a book, you want to see what Chapter 6, Section 6, says, and what you will do, the average person must go to the catalogue, find the corresponding pages of this section, and then turn to this page. This is the catalog index, which helps readers quickly find the chapters they want. In databases, w ...

In Linux system management, it is sometimes necessary to set account password complexity (length), password expiration policy and so on, which is mainly controlled by some parameters in the / etc/login.defs parameter file. It is mainly used for user account restriction. The parameters are as follows:/etc/login.defs:# Password aging&nb ...

Api of Node.js File System //Public citation var fs = require('fs'), path = require('path'); 1. readFile function for reading files //readFile(filename,[options],callback); /** * filename, Required parameter, file name * [options],Optional parameters, can specify flag (file operation options, such as r + read and write; w + read and ...

I. What is a message queue Message queue: Message queuing provides a way to send a data block from one process to another. Each data block is considered to have a type. The data block received by the recipient process can have different type values. We can avoid the synchronization and blocking problems of named pipes by sending messages. So ...

What is SDL (from Baidu Encyclopedia): SDL (Simple Direct Media Layer) is an open source cross-platform multimedia development library written in C language. SDL provides several functions to control the input and output of images, sounds, and so that developers can develop across multiple platforms (Linux, Windows, Mac) with the same or simil ...

Introduction: Systems before CentOS6 and CentOS6 will store the system on two discs, DVD1 and DVD2. DVD1 can be used to install the operating system. System installation package files are stored in DVD1 and DVD2 respectively. When installing software using local yum sources, if you only use the package files on one disc, the installation ...