Add a virtual storage device to a Virtual Machine

5th June 2013 by Nicola Asuni

Following our previous article about resizing virtual machine images, we now look adding an additional storage device to an existing VM. If instead you wish to extend the existing VM storage volumes, please consult the article “Resize a CentOS Virtual …

Resize a CentOS Virtual Machine Image

3rd June 2013

Following our series of articles about virtual machine images, we now look at a common problem faced by system engineers – what happens when you run out of disk space on your virtual machine? This guide addresses this issue and …

Automated CentOS Virtual Machine Image Creation

28th May 2013

This article shows how to create a CentOS Virtual Machine (VM) in unattended mode using a shell script and illustrates the main steps and options to reproduce the process manually. The following script and commands will create a base image …

Building a virtual machine image for CentOS

18th April 2013

This post describes the process of creating a CentOS virtual machine image. Creating a base or master image is incredibly useful in a cloud environment as it allows the creation of multiple nodes / VMs or guests based on the …

CatN goes to CentOS Dojo Antwerp

12th April 2013

It’s no secret that we use a lot of CentOS at CatN, in fact we have deployed thousands of instances over time on both physical and virtual machines, and we have 4 Red Hat Certified Engineers (soon to be 6) …

P2V migration – a live CentOS server to a KVM guest

30th August 2012 by Dawid Golunski

Recently we had to migrate a live physical server into a guest running under KVM. This article describes the physical to virtual process and can be helpful if you need to clone a physical server without taking it down and …

How to create TCPWebLog RPM packages for Enterprise Linux

15th June 2012

This is a short hands-on tutorial on creating TCPWebLog RPM packages for Enterprise Linux, including, but not limited to, Red Hat Enterprise Linux (RHEL), CentOS and Scientific Linux (SL). TCPWebLog is a Free Open Source Software system designed to collect …

Diary of a Linux n00b

11th June 2012

If you’d asked me about Linux 3 months ago I’d have muttered about Ubuntu before quickly changing the subject to whether anyone wanted a cuppa and made a run for the nearest door; I can now proudly say I’ve configured …

ServerUsage – Measuring users’ activity on Linux hosts

24th May 2012

ServerUsage is a Free Open Source Software system to collect and process usage statistic information from multiple computers running a GNU-Linux Operating System. Since CatN is a “cluster” hosting company, one of the challenges is to track and analyse the …

How to create ServerUsage RPM packages for Enterprise Linux

23rd May 2012

This is a short hands-on tutorial on creating ServerUsage RPM packages for Enterprise Linux, including, but not limited to, Red Hat Enterprise Linux (RHEL), CentOS and Scientific Linux (SL). ServerUsage is a Free Open Source Software system to collect and …

How to create SystemTap 7 RPM packages for Enterprise Linux

22nd May 2012 by Nicola Asuni

This is a short hands-on tutorial on creating SystemTap 7 RPM packages for Enterprise Linux, including, but not limited to, Red Hat Enterprise Linux (RHEL), CentOS and Scientific Linux (SL). “SystemTap provides free software (GPL) infrastructure to simplify the gathering …

How to create SQLite 3 RPM packages for Enterprise Linux

21st May 2012

This is a short hands-on tutorial on creating SQLite 3 RPM packages for Enterprise Linux, including, but not limited to, Red Hat Enterprise Linux (RHEL), CentOS and Scientific Linux (SL). “SQLite is a software library that implements a self-contained, serverless, …

How to set up a build environment for RPM packages on Enterprise Linux

20th May 2012

This is a short hands-on tutorial on creating the development environment to build RPM packages for Enterprise Linux, including, but not limited to, Red Hat Enterprise Linux (RHEL), CentOS and Scientific Linux (SL).

NetsGraph – Statistical graphics for network data transfer

18th May 2012

NetsGraph (https://github.com/fubralimited/NetsGraph) is a simple Free Open Source PHP class to generate statistical graphics from network data transfer. While several free tools are available to create graphs from network data, after some quick research I couldn’t find a good fit …

CatN experts become RHCSA accredited

1st August 2011

Last week the CatN office was decidedly quiet. We had decided to send some of our hosting experts on the RHCSA fast track course to become accredited as Red Hat System Administrators. In particular we chose the RH200 course combining …

Resolving bind zone transfer issues

11th March 2009 by Mark Sutton

Today, a fax machine at the office started complaining that it couldn’t send emails. No useful error messages or anything… After some digging it turns out the fax machine was getting SERVFAIL from the name server. This nameserver carries slaved …