Avoiding CPU Speed Scaling – Running CPU At Full Speed

If you have a server on collocation with the super-fast CPU, that doesn’t mean that you get it running at full power. Here is a preamble. When doing inventory of Linux servers, that I’m administering, I’ve found that some of them are running on lower CPU speed, then they could. This can be easily checked with this command: #grep -E …

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How to install cron (crond, crontab) in CentOS

Cron is a daemon that can be used to schedule the execution of recurring tasks according to a combination of the time, day of the month, month, day of the week, and week. This is how I install crond onto my CentOS server edition as it doesn’t seem to come preinstalled, this might not be true for other distributions and …

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How to install Nagios on CentOS 5 or 6

Introduction This guide is intended to provide you with simple instructions on how to install Nagios from source (code) on CentOS and have it monitoring your local machine inside of 20 minutes. No advanced installation options are discussed here – just the basics that will work for 95% of users who want to get started. These instructions were written based …

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Enabling SNMP On CentOS / RHEL

Setting up SNMP (Simple Network Management Protocol) on a CentOS machine is a very quick and easy process. First we will install SNMP itself by running the following command: yum install net-snmp Once you have SNMP installed we will want to install the configuration utility for SNMP. The configuration utility allows you to easily configure SNMP for both the community …

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Install Ruby on Rails in cPanel/WHM

The installation of Ruby on Rails in cPanel has two parts, first is installing Ruby itself, which can be accomplished by running: [code]/scripts/installruby[/code] This script will install Ruby, RubyGems, Mongrel and the software that Ruby relies upon and activates the Ruby interface in your end user’s cPanel. The second step in the installation is running. [code]/usr/local/cpanel/bin/ror_setup[/code] This script will setup …

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How To: Add swap to a KVM VPS or Dedicated Server CentOS 6

Swap is beneficial, because it allows inactive memory blocks to be written to disk, freeing up real memory for stuff like file system caching. Swap also (to some extent) protects you against short bursts of memory demand. Linux (by default) over commits real memory, relying on the fact that most applications ask for more than they need, but if they …

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