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Linux Cloud Technologies 2013

  Build the cloud on Linux!  This year looks very promising for Linux when it comes to building your private cloud using open source technologies.  Finally, Linux-based software and application

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Linux Cloud Technologies 2013

KVM and GlusterFS 3.3.1 performance on CentOS 6

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by on January 30, 2013 at 6:32 pm

Currently I am testing the usability and performance of GlusterFS as a suitable virtual image store for the KVM hypervisor on Centos 6.

Setup:

Hypervisor: Centos 6 x64, AMD Phenom II 1090T, 16G RAM DDR3 1033mhz. HDD: 7200RPM SATA II.
Storage Node: Fedora 18 x64. HP Proliant DL380 G4. 4G RAM DDR. RAID 1 SAS 10k.
VM-remote: Debian 6 x64. 2G RAM, 2 Virtual CPUs. RAW 8G disk on glusterfs volume.
VM-local: N/A (coming soon)
Network: Direct patch 1Gbps ethernet.

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Backup MySQL database

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by on January 16, 2013 at 6:44 pm

Today, we’re going to be covering the 3 most important rules for any Linux System Administrator:  Backups, Backups, Backups.

That’s right, if you don’t have backups, you have failed in your duties.  Every single thing else you may have done to secure your system cannot replace the need for backups.  Systems get cracked, hard drives fail, CPUs fail, RAM fails, password are forgotten, files get rm’d by mistake, patches break systems.

This article is about creating a simple backup script to backup your MySQL databases to an offsite location, complete with cron jobs, and encryption.

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Ubuntu: install packages from CD

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by on January 12, 2013 at 10:18 pm

Recently I installed a system with Ubuntu Server, and neglected to install openssh-server.  While I had terminal access, I didn’t have internet access, so I simply couldn’t run apt-get to install the missing packages.  I was stuck in the data center (virtually stuck, anyway) with a decision:  Spending another 40 minutes re-installing the operating system, or somehow install the packages from the installation disk.  I chose the latter, and while it took more time than just re-installing the system to figure it out, it will surely save me time in the long run as this is most likely not the last time I will encounter this missing package problem.

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in Distros, How-To, Ubuntu

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Ubuntu 10.04 rescue information

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by on January 12, 2013 at 9:35 pm

I recently encountered a problematic server running Ubuntu 10.04 server.  The problem was simple, and so was the solution, but there were many hurdles in the way that, if you’re not familiar with them, will prevent you from accomplishing the task.  This should apply to later Ubuntu distros as well.

Scenario:  The server is a Dell, on the other side of the country.  You have only DRAC access, no ability to manipulate anything physically.  Somehow, the root password was changed, and now no one can log into the server remotely. (more…)

in Distros, How-To, Ubuntu

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Debian Wheezy PXE server

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by on January 1, 2013 at 4:47 pm

Creating a PXE boot server is both easy and useful.  PXE boot services allow an administrator to install or boot an operating system dynamically every time a machine is booted.  This method is especially useful for imaging multiple servers in an automated fashion.

I’m writing this entry to outline the steps necessary to create a Debian server that provides DHCP and PXE boot services of multiple to specific hosts on the same network.

Requirements:  Debian Wheezy or other compatible server with plenty of free space, and an additional server/computer on the same network (or virtual network) as the Debian server.  If you’re using something other than Debian Wheezy, I can’t assure you the packages will be the same and configured the same way.  This is Linux, after all.

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in Debian, How-To

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