Programmer Group

1. Upgrade the ubuntu version premise You can upgrade directly from Ubuntu 18.04 or Ubuntu 19.10 to version 20.04. If you run any previous release, you must upgrade to 18.04 or 19.10 first. backups First and foremost, make sure you back up your data before making a major upgrade to your operating system. If you're running Ubuntu on a vi ...

1, Docker introduction 1. Introduction Docker is an open source application container engine and a lightweight container technology. Open source based on Go language and Apache 2.0 protocol. Docker allows developers to package their applications and dependency packages into a lightweight and portable container, and then publish them to an ...

Firewall Firewall function In the computer field, firewall is a device used to protect information security. It will allow or restrict data transmission according to user-defined rules. A device used to protect intranet securityProtection according to rulesUser defined rulesAllow or deny access to external users Firewall classifica ...

What is IPC IPC [inter process communication] interprocess communication refers to some technologies or methods for transmitting data or signals between at least two processes or threads. In Linux/Unix, many IPC are provided. Seven IPC of UNIX: Pipe: nameless pipe, the most basic IPC, one-way communication, only between parent / child process ...

Encapsulation of Linux 'C/C + + shared memory with message queue + semaphore 1, Train of thought The server demo I do is divided into two servers: the front server and the rear server. The front server is used to receive information, contract and unpack, while the rear server is used to process the package business. The front and rear process ...

The purpose of this paper is to compile and install the famous C/C + + image processing open source software library OpenCV3.4.12 on Ubuntu 18.04 system, and practice using OpenCV to process pictures and videos. 1, Compile and install OpenCV   1. Compile and install source code Now there are some posts about installing OpenCV on the I ...

Project resource requirements   VMVare15 resource link: https://pan.baidu.com/s/1cVzeKjqu0Cmp4qMRDbFx8Q Extraction code: tdn4   CentOS7 image file link: https://pan.baidu.com/s/14QyfiXYYObdynswJlOoI1g Extraction code: 6cxp   oracle11 Linux version link: https://pan.baidu.com/s/16hWmzGudLjUEpkRzHAOGZw Extraction code: y34w &e ...

1, Generating. a static library and. so dynamic library with gcc 1. Example 1 explanation of Hello program ① Create a directory and edit the generated sample programs hello.h, hello.c, and main.c (1) Example program hello.h #ifndef HELLO_H #define HELLO_H void hello(const char *name); #endif (2) Example program hello.c #include<st ...

1. Disadvantages of traditional gcc -o instruction 9.5 Assuming that there are two C files, a.c and b.c, I call the function in b.c in the main function of A.C, then the compiler directive for generating executable program is: gcc -o test a.c b.c This instruction will preprocess, compile and assemble a.c and B.C respectively, finally ge ...

1, Introduction to SpringCloud Alibaba Nacos The full name of Nacos is Naming Configuration Service. Taking the first two letters of Naming and Configuration and s of Service, it is the Configuration management and Service management center. In short, Nacos = Eureka + Config + Bus, that is, the combination of registry + configuration center. ...