This is an introduction on how to improve your security of your Linux server. The mentioned applications are available for Ubuntu 16.04 and newer.

Coturn是一个 "turn"和 "sturn server"，可用于如。VoIP。它允许你在不同网络中的客户机之间建立连接。

This error 1236 ("Got fatal error 1236 from master when reading data from binary log") means that there is inconsistency in the file "mysql-bin.index" of the slave server.This is part of the MySQL Replication series.

How to setup Go-neb (latest version). This is a chatbot (chat bot) that provides services such as The automatic sending of RSS news feeds, searching for GIF images or information from Wikipedia and many other functionalities. The chatbot is easy to set up and can then be used via the messaging client Riot (client for the matrix server).