If you have configured Sendmail on your Linux system and are still unable to send emails because of a unqualified hostname error, we have a few suggestions that you can use to try and remedy the issue. In this tutorial … The post Sendmail: “unqualified hostname unknown; sleeping for retry unqualified hostname workaround first appeared […]
How to install and configure sendmail in ubuntu to send emails (you can also send them in php, you can also send anonymous emails) 1. Install sendmail sudo apt install sendmail 2. Modify the /etc/hosts file and add the localhost.localdomain item (fully qualified domain name) sudo vim /etc/hosts Modified as follows: 127.0.0.1 localhost.localdomain localhost lenix-Swift-SF314-512
Author: Tao Jinliang, senior client development engineer of NetEase Yunxin In recent years, the field of real-time audio and video has become more and more popular, and many audio and video engines in the industry are implemented based on WebRTC . This article mainly introduces the background and related technology implementation of WebRTC in video
WebRTC series video stream Read More »
<!DOCTYPE html> <html lang=”en”> <head> <meta charset=”UTF-8″> <title></title> <style> * { margin: 0; padding: 0; } div { display: inline-block; height: 30px; line-height: 40px; text-align: center; position: relative; vertical-align: bottom; } span { display: inline-block; width: 3px; margin-bottom: 0; background-color: … The post CSS3 using animation to implement a volume-like jumping loading icon first appeared
CSS3 uses animation to implement a class volume jumping loading icon Read More »
Under Linux system, Nautilus Image Converter can be installed and used to adjust image size by right-clicking. It can be used under Ubuntu, Debian, Fedora and other systems. foreword Image resizing is one of the most common image editing tasks, it can drastically reduce image size from MB to KB, allowing images to be loaded
Install Nautilus Image Converter to enable right-click resizing of images Read More »
Introduction ~~~~~~~ First of all, it is necessary to clarify that the so-called AVC is actually the H.264 standard, which was developed by the Joint Video Team (JVT) composed of ITU-T and ISO/IEC. ITU-T named this standard H.264 ( Formerly called H.26L), while ISO/IEC calls it MPEG-4 Advanced Video Coding (AVC) It is positioned to
Four image qualities of H.264 (BP, EP, MP, HP) and Profile, Level, Encoder Read More »
In programming, dynamic variable names do not have specific names hardcoded in scripts. They are dynamically named using string values from other sources. Dynamic variables are rarely used in JavaScript . But in some cases, they are useful. Unlike PHP, there is no special implementation of dynamic variable names in JavaScript. But similar results can
Using JavaScript dynamic variable names Read More »
1. Problem description: When the height is fixed or not fixed, it is difficult to achieve vertical centering of single-line or multi-line text; Second, the solution: 1. Use the line-height property to set the line-height to be the same height as the element height. Limitations: Only applicable to single-line text, with great limitations. Code: .box
7 ways to vertically center text in CSS Read More »
what is npm npm ( node pakage manage) is a third-party package manager and is the default package management tool for the Node.js platform. what npm does Through npm, you can install, share, distribute code, and manage project dependencies. example: When configuring webpack, many third-party modules (modules occupy a pit) need to be installed through
The process of npm install and npm run Read More »
This article describes how to create a web server in Linux system, and set up Systemd to automatically start and manage the operation of the web server. Set up an Echo server First write a simple echo server in Python and store it in /opt/echo_server.py : #!/usr/bin/env python3 import socket # create socket serv =
How to add an automatic startup program at boot through systemd in linux Ubuntu Read More »
The first alpha release of PHP 8.2 is now available for testing. PHP 8.2 Alpha 1 is the first QA release of PHP 8.2. Although they are unstable and not suitable for use in production systems, they provide an opportunity to test upcoming PHP versions in advance. PHP 8.2 Alpha 1 is the first release
PHP 8.2 Alpha 1 released on June 10 Read More »
1. Problem description When using supervisorctl to start the website, it prompts an error: ERROR (spawn error), as shown in the following figure: 2. Problem Analysis 1. View the supervisor configuration file For example: /etc/supervisor/conf.d/supervisor-mysite.conf [program:mysite] command =/usr/local/bin/gunicorn — bind unix:/tmp/www.sweeneys.cn.socket mysite.wsgi:application directory=/home/Sweeneys/www/mysite user=Sweeneys autostart= true autorestart= true stopasgroup= true killasgroup= true redirect_stderr= true stdout_logfile_maxbytes=200MB
supervisor error: ERROR (spawn error) Read More »
If your app is running slowly or has a lot of database queries, follow these performance tuning tips to improve your app’s load time. 1. Retrieving large datasets # This tip focuses primarily on improving your app’s memory usage when working with large datasets. When processing large collections, retrieve results in groups instead of all
18 Laravel 8 Database Query Optimization Tips Read More »