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Best CentOS Tutorials

Our CentOS Tutorials let you expand your Linux knowledge. Our step by step CentOS tutorials are easy to understand and are backed up by true Linux professionals. Don’t waste time researching, we have the most popular CentOS Tutorials with real life examples, tips and tricks so you can become a true CentOS master.

Yum Error: Timeout on repomd.xml. Operation too slow

A few days ago I was updating one of my personal dedicated servers and I got this weird error: Yum Error: Timeout on repomd.xml. Operation too slow. Less than 1 bytes/sec transfered the last 30 seconds. The full output was something like this: [root@server.centralesoterica.com:~]yum update Loaded plugins: fastestmirror Setting up Update Process Determining fastest mirrors epel/metalink | 24…

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MySQL Error Table ‘mysql.servers’ doesn’t exist

While trying to grant privileges to a MySQL user on a plain CentOS 6.x server, I was receiving this error at the mysql console: MySQL Error Table ‘mysql.servers’ doesn’t exist I was surprised… the first thing that came to my mind was ‘mysql database got corrupted’, and indeed that was the problem. The mysql.user table should definitely exist…

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How to Deploy Ruby + Passenger + Nginx on CentOS Linux

Before we get started into the technical tutorial, let’s first review the technologies involved in this Ruby + Passenger + Nginx guide on CentOS Linux. Ruby is an agile, dynamic open source language focused on easy and natural code writing and reading, while keeping a nice and elegant simple syntax. Passenger is an app server that is used to server…

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How to fix: mysqlnd cannot connect to MySQL 4.1+ using the old insecure authentication

After upgrading a PHP server from PHP 5.3.3 to PHP 5.6.x, working with MySQL Server 5.1.x on a plain CentOS 6.x 64 bits box, there were a few new web apps were showing this mysqlnd connection error: mysqlnd cannot connect to MySQL 4.1+ using the old insecure authentication This was the complete and exact error: mysqlnd cannot connect to…

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Install ElasticSearch on cPanel Servers

ElasticSearch is a powerful search engine that provides full schema-free JSON text search queries over a web interface. It’s multi-platform as it runs well on Linux and Windows operating systems. In order to work, it requires Java to be installed on your server. It’s also open source under the Apache license. Today we are going to show you…

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How to increase Swap size on CentOS + cPanel

Today you will learn how to increase Swap size on Linux systems, this applies to CentOS Linux and cPanel based servers. Sometimes our swap memory size is too small, and once your swap is totally consumed, you will face really slow speeds on your server because your RAM + Swap will be fully used. But hey, what’s Swap…

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How to know if I have an SSD drive or HDD?

Sometimes our dedicated servers come with Solid State Drives, but… how can you really know that what’s inside your box is an SSD or a HDD drive? On this post you will find ways to know if I have an SSD drive or HDD running inside my box. As we all know, SSD drives are really well in terms…

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