yum  CentOS  package management  linux  system administration 

A quick reference for Yum - the CentOS package manager.

MySQL  MariaDB  RDBMS  system administration 

Quick notes on how to enable root / admin user privileges from remote hosts.

Ubuntu  Ubuntu 16.04  SSH  SFTP  system administration  config files 

How to grant users SFTP access via the /etc/ssh/sshd_config file in Ubuntu 16.04

Debian 10  Apache 2.4  Apache  system administration  linux  PHP  PHP-FPM 

How to switch from Apache2 mpm_prefork to mpm_event module and setup php-fpm in Debian 10.

Apache 2.4  Apache 2  Apache  mod_access_compat  Apache modules  system administration  Apache performance tuning 

Yes, in Apache2.4 the `mod_access_compat` module can safely be disabled, as long as you remove all the deprecated 'Order', 'Allow', and 'Deny' directives from your apache and vhost configs.