A collection of tutorials to manage CentOS and Redhat based systems, including performance tuning, installation, administration, and troubleshooting.
NTP (Network Time Protocol) is a protocol which allows computers to synchronize time. NTPd is a daemon that maintains the system time in synchronization with other NTP servers. This prevents drift which is the slow inconsistency of time on computers internal clocks. Keeping system time accurate is particularly important for system logs, replication, and applications. […]
ProFTPd is an Open source FTP daemon, widely used for its granular configuration ability. This is a guide to provide install methods for both CentOS 7 aswell as CentOS 6 and below. You can read more about ProFTPD on the project’s website. Install ProFTPD ProFTPD is in the EPEL repository, you will need to install […]
Supervisord is a simple system for process management and monitoring. It can start processes or restart them when they crash. The repositories for CentOS 6 for supervisor are quite old (version 2.x) which do not contain the latest features. You can read more on the project’s website. If you already have an existing installation installed through […]
SSH key authentication can be used for password-less login between 2 servers. This is also useful for adding a key to accounts like git or gitlab for version management. Source Server SSH Key Configuration Generate a RSA key for this system by typing the following ssh-keygen -t rsa The key generated will ask for a […]
Mod_deflate is an apache module. Prior to having mod_deflate it was mod_gzip. Post apache 2.0 mod_deflate is used, it provides a slightly better compression than mod_gzip. It allows the size of certain file types to be compressed which in-turn allows clients to be able to download these files faster. This will cause the site itself […]
FFmpeg is a video editing software that can be used to convert audio and video streams in linux. Compiling ffmpeg from source can be quite complex, so there are a couple alternatives, either installing from yum or a static build already created. If you are looking for a more recent release than you should follow […]
You can use nginx to either allow or deny certain countries from accessing your site using the GeoIP database which maps IP addresses to the origin country. Nginx GeoIP Requirements Nginx Installation – Nginx must already be installed on your server if it is not yet. Please see How to Install Nginx Nginx must also be […]