Redis is an excellent open source distributed caching system. This article describes in detail how to install Redis on CentOS7.

JavaScript does not provide a method to directly convert a time string into a date type. This article provides a usable conversion function.

The exec command in PHP allows us to directly execute system commands. Many times we will use it. However, due to the limited running permissions of PHP, the execution will fail. This article will help you solve this problem.

MongoDB is a non-relational database based on distributed file storage, which is written in C++. Designed to provide scalable high-performance data storage solutions for WEB applications. It is a product between relational database and non-relational database. It is the most versatile and closest to relational database among non-relational databases. This article details the installation and configuration of MongoDB4.2 on CentOS7.

Elasticsearch is a distributed full-text search engine based on Lucene, developed in Java language. This article describes in detail how to install Elasticsearch7.3 on CentOS7.

AMS1117-3.3 and LM1117MPX-3.3 are forward low-dropout regulators with an output voltage of 3.3V. This article mainly introduces its basic parameters and typical application circuits. In addition, we will also introduce some products of the same type of Chinese brands, with the purpose of replacing it perfectly without modifying the PCB, and can greatly reduce the cost.

After installing Python3 on CentOS7, it prompts that libpython3.7m.so.1.0 does not exist when running python3. This article helps to solve this problem.

When using YUM on CentOS7 to install PHP by default, the installed version is 5.4. When we need to install other versions of PHP, we can refer to this article. This article takes the installation of PHP7 as an example. Readers can also install other versions according to their needs.

ss5 is a SOCKS5 proxy server for Linux, Solaris and FreeBSD, which implements the SOCKS4 and SOCKS5 protocols.The purpose of this article is to help readers successfully install the latest version of ss5 on CentOS7 and configure the SOCKS proxy server. This installation process should have been repeatedly tested by the author to ensure success.