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Why is the space not released after deleting a file?

Have you ever encountered a situation in a Linux environment where files have been deleted but the space has not been released? This short article will introduce a scenario of this problem and the corresponding solution. One of our application servers, operating system is RedHatLinux, monitoring alarm, /opt/applog file system usage exceeds the threshold, the overall capacity is 50G, but the actual file capacity is found to be 20G, what is the remaining 30G space? We know that in the Linux environment, everything exists in the form of a file. In the background, the system allocates a file descriptor to each application. It provides a common file descriptor for the interaction between the application and the operating system. Since the interface is a file, it will take up space. This

Jan 08, 2024 pm 02:46 PM

Linux红帽

Tesla FleetAPI is upgraded again to fully support Powerwall and other energy devices

Tesla Energy announced today that their latest Fleet API is fully compatible with Powerwall energy systems, solar panels and WallConnector wall-mounted connectors. The news was announced on January 5 via Tesla’s X platform. Tesla launched FleetAPI designed for "fleet management" in October 2023, and provided detailed development documents to facilitate developers to create third-party applications. This move shows Tesla’s determination to promote intelligent and networked energy products. It is understood that FleetAPI is a data and command service based on RESTful architecture that enables partners to communicate with Tesla

Jan 07, 2024 pm 02:14 PM

特斯拉

Secrets of the mainstream PHP8 framework that you must know

Revealing the secrets of PHP8 mainstream frameworks: You must know these frameworks! With the release of PHP8, many new features and improvements make PHP a more powerful and efficient programming language. This has also led to many mainstream frameworks successively updating and adapting to the changes in PHP8. In this article, we will explore some of the mainstream PHP8 frameworks worth paying attention to and provide some specific code examples. These frameworks not only make it easier for you to develop PHP applications, but also take full advantage of PHP8. Laravel8Larav

Jan 05, 2024 pm 03:40 PM

PHP揭秘主流框架

What is the difference between spring-webmvc and spring-web

The differences between spring-webmvc and spring-web: 1. Infrastructure and integration; 2. Dependencies; 3. Project structure and features; 4. Usage scenarios. Detailed introduction: 1. Infrastructure and integration, Spring Web: Provides the infrastructure of Spring-based Web services, including core HTTP integration, Servlet filters, Spring HTTP Invoker, etc. Spring Web MVC is an implementation of Spring MVC, etc. .

Jan 05, 2024 am 11:23 AM

spring-webspring-webmvc

What are the principles and applications of the struts framework?

The principle of the struts framework: By using Java Servlet/JSP technology, an application framework based on the MVC design pattern of Java EE Web applications is implemented. It uses one or more Action classes to process user requests and return the results to the user. Application of struts framework: 1. Build Web applications; 2. Process form data; 3. Integrate third-party libraries; 4. Implement internationalization; 5. Build RESTful API.

Jan 03, 2024 pm 05:31 PM

struts框架Struts

Django version query and development guide

How to check the Django version and develop accordingly. Django is a popular Python Web framework that provides rich functions and flexible development methods. As Django versions are constantly updated, it is important for developers to understand and use the appropriate version. This article will introduce how to check the Django version and develop accordingly, and provide relevant code examples. The method to check the Django version is very simple, we can get it through the command line. At the command line, enter the following command to view

Jan 03, 2024 am 10:45 AM

Django版本查看：version开发：develop相应：corresponding

Role definition of Spring framework: Is it a common tool for front-end or back-end development engineers?

Explore the positioning of the Spring Framework: Is it a front-end or back-end development tool? Introduction: Spring is a powerful and widely used open source framework for Java enterprise application development. However, for beginners, the positioning of the Spring Framework may feel a bit vague. Is it a front-end or back-end development tool? This article will explore the positioning of the Spring framework and give relevant code examples. 1. Overview of Spring Framework Spring is an IoC (Inversion of

Dec 30, 2023 pm 01:20 PM

Spring框架前端开发后端开发

Why choose to learn Java Spring framework?

Learn JavaSpring framework, why choose it? The JavaSpring framework is one of the most popular and widely used frameworks in modern Java development. Its emergence greatly simplifies the development of enterprise-level applications and provides rich functionality and flexibility. There are several important reasons worth considering when choosing to learn the JavaSpring framework. First of all, the JavaSpring framework has excellent ease of use. It provides a flexible container for managing the production of Java objects.

Dec 30, 2023 am 10:15 AM

SpringJava选择

Spring framework analysis: Which is the best solution to choose front-end or back-end?

Spring framework analysis: front-end or back-end preferred? Introduction: In modern Internet development, front-end and back-end are the two directions that developers often face. The front-end is responsible for the development of the user interface, and the back-end is responsible for data processing and business logic implementation. However, as technology continues to develop, many developers have begun to think about which direction they should focus on. This article will introduce the Spring framework, explore its role and application in front-end and back-end development, and provide some specific code examples. 1. Introduction to Spring Framework:

Dec 30, 2023 am 09:09 AM

前端后端Spring框架

A deep dive into the key features of the Java Spring framework

JavaSpring framework is a popular application development framework that is widely used for building enterprise-level Java applications. It provides many core functions and features that enable developers to build scalable, flexible and maintainable applications in an efficient manner. This article will explore in depth the core features of the JavaSpring framework. Inversion of Control (IoC) and Dependency Injection (DI) One of the core concepts of the JavaSpring framework is Inversion of Control (IoC) and Dependency Injection (DI). IoC passed

Dec 30, 2023 am 09:01 AM

Java Spring框架功能核心探索

What is the difference between SpringBoot and SpringMVC?

SpringBoot and SpringMVC are two frameworks commonly used in Java development. They are both provided by the Spring framework, but they have some differences in functions and usage methods. This article will introduce the characteristics and differences of SpringBoot and SpringMVC respectively. 1. Features of SpringBoot: Simplified configuration: SpringBoot greatly simplifies the project configuration process through the principle of convention over configuration. It can automatically configure the parameters required by the project, and developers

Dec 29, 2023 pm 05:19 PM

框架SpringBootspringmvc

What are the differences between spring and springmvc

The difference between spring and springmvc: 1. Positioning and functions; 2. Core functions; 3. Application areas; 4. Extensibility. Detailed introduction: 1. Positioning and functions. Spring is a comprehensive application development framework that provides dependency injection, aspect-oriented programming, transaction management and other functions. It is designed to simplify the development of enterprise-level applications, and Spring MVC is the Spring framework. A module in it is used for the development of Web applications and implements the MVC pattern; 2. Core functions and so on.

Dec 29, 2023 pm 05:02 PM

springmvcspring

Is the spring framework front-end or back-end?

The spring framework is the backend. A lightweight framework for building enterprise-level Java applications, providing a wealth of functions and components, including dependency injection, aspect-oriented programming, transaction management, data access, messaging, etc., as well as integrated support for various application layer frameworks . The design goal of the Spring framework is to simplify the development of enterprise-level applications, improve code maintainability and testability, and reduce development complexity. Therefore, it is mainly used for the development of back-end applications, such as web applications, RESTful services, batch processing applications, etc.

Dec 29, 2023 pm 04:53 PM

spring框架

The difference between SpringCloud and SpringBoot and analysis of application scenarios

SpringBoot and SpringCloud are two of the more popular development frameworks in the Java field. They are both developed by the Spring team and are widely used in enterprise-level applications. This article will introduce the characteristics and application scenarios of SpringBoot and SpringCloud respectively, and conduct a comparative analysis of them. 1. Characteristics and application scenarios of SpringBoot SpringBoot is a rapid development framework mainly used to simplify Spring applications.

Dec 29, 2023 pm 04:21 PM

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