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Server architecture The server system is Centos7 First, we need to know the external architecture of the system General architecture: 1. Domain name - > ECS 2. Domain name - > CDN - > cloud server (OSS) 3. Domain name - > CDN - > ECS + RDS + Redis cache 4. Domain name - > CDN - > Load Balancing - > ECS + RDS (mast ...

introduce vue-element-admin Is a back-end front-end solution based on vue and element-ui Realization. It uses the latest front-end technology stack, built-in i18 internationalization solutions, dynamic routing, privilege validation, extracts a typical business model, provides rich functional components, which can help you quickly build enterpr ...

1. Preface If you have done Linux system transplantation or Linux related development, you should be familiar with the term root file system. In the process of building an embedded development environment, you must do three things: porting bootloader, porting kernel and making root file system. The root file system is the first file system mo ...

Before HTML5, browsers and servers communicated through the HTTP protocol, so what's the use of introducing a WebSocket? Imagine a web page broadcasting a score of a football match live in text. Without a WebSocket, the client, or browser, usually updates the score dynamically in two ways: AJAX and long polling. What is the difference between ...

1. Preface U-boot is an open source bootloader, which is used to guide operations and provide developers with testing and debugging tools. It is a simplified Linux system, which is mainly responsible for the initialization and boot of hardware. It has some tools as the boot program, often as the boot of embedded devices. When the real system s ...

1. Installation test CMake can also specify installation rules and add tests. These two functions can be executed by using make install and make test after generating makefile. In GNU Makefile, you may need to write install and test pseudo targets and corresponding rules for this, but in CMake, such work also needs to simply call a few command ...

1, Use of Dom4j 1. Introduction to XML parsing There are two common XML parsing methods in daily development DOM: the parser is required to load the entire XML file into memory and generate a Document object. Advantages: the structure and relationship between elements are preserved, and you can add, delete, check and modify elements. Dis ...

1. Data transmission design of chat room Necessary conditions: client and serverNecessary constraints: data transfer protocolPrinciple: the server listens to the message source, the client links to the server and sends a message to the server 1.1 data interaction between client and server The client sends a message to the server, and the se ...

Deployment planning This job is the three node deployment method of OceanBase cluster. Directly and remotely log in to the OceanBase node through the central control computer to deploy and start the observer and obproxy processes. Since there are exactly seven physical machines on hand, OBD will be directly deployed as an OceanBase cluster wi ...

Asynchronous request pool What is the difference between synchronous and asynchronous? Concept: it is the relationship between the two. For example, processes and processes, or clients and servers. Whether the request will be suspended and wait for return after being called or sent. Synchronization: after calling the interface, the process ...