How To Install NTPD On CentOS 7

by LinuxAdmin.io - July 31, 2017September 24, 20170

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

Install And Configure ProFTPD On CentOS

by LinuxAdmin.io - July 17, 2017August 20, 20170

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

How To Upgrade Supervisord In CentOS 6

by LinuxAdmin.io - July 11, 2017September 24, 20170

Supervisord is a 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

How To Setup SSH Key Authentication

by LinuxAdmin.io - July 4, 2017August 6, 20170

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

Install mod_deflate on Apache

by LinuxAdmin.io - June 26, 2017August 6, 20170

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

FFMpeg Install On CentOS 7

by LinuxAdmin.io - June 21, 2017August 6, 20170

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

Block Countries With Nginx and GeoIP

by LinuxAdmin.io - June 13, 2017August 6, 20170

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

Nginx Browser Caching

by LinuxAdmin.io - June 7, 2017August 6, 20170

You can use Nginx to Set cache expiration times to leverage browser caching for the user requesting specific file types. This will cause the browser to retain the downloaded image until the length of the expires header. This will cause faster page time loads on each subsequent request performed by

Piwik Analytics on Nginx

by LinuxAdmin.io - June 5, 2017August 6, 20172

Piwik is a open source web site analytics software. It is free and opensource and can be used to track Nginx requests as well as Apache. This guide covers the Nginx configuration and installation of Pikwik. You can read more about Piwik here. If you do not already have Nginx and

Blocking Bad UserAgents with ModSecurity and Fail2ban

by LinuxAdmin.io - May 31, 2017August 6, 20170

Many bots crawl websites that do nothing to generate positive traffic for the site. They just use up available resources and bandwidth of the server. You can reduce this drastically by implementing blocking using ModSecurity to detect the bad agents and then fail2ban to block them in iptables for a