Category Archives: Devops/Linux

Encrypting an existing Centos install (2)

In a previous post, I described how to encrypt an existing Centos install that approach was based on find out how LUKS worked and then creating a storage logical volume that was encrypted with then logical volumes on top of … Continue reading

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Encrypting an existing Centos install

Edit: Meanwhile I have found a better way to migrate an existing centos unencrypted install to a fully encrypted install with /boot as the only unencrypted disk space. This solution is much preferred over the one described in this post. … Continue reading

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Creating a USB install for Centos 6.4

The days of rotating disks for storing information and in particular for installing OSes are nearing their end. Why rely on something with rotating parts for storing data in the 21st century? Unfortunately, not every software vendor has caught up … Continue reading

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Java from the trenches: improving reliability

Java and the JVM are great things. In contrast to writing native code, making a mistake in your Java code will not (or should not) crash the virtual machine. However, in my new position working for a SAAS company I … Continue reading

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Nested Logical Volume Management for VMs

Towards a more consistent virtual machine setup using nested logical volume management. I.e. the host/hypervisor allocates storage for virtual machines using logical volume management. The virtual machine itself partitions these virtual disks and uses logical volume management again to simplify management. This blog describes how I migrated and existing VM to use this approach as well.
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Improvements to Snapshot Backup Scripts

The snapshot scripts that I blogged about earlier have undergone a number of important changes. I had been having a lot of problems with the cleanup of snapshot volumes and with the deletion of the old backup logical volumes. This … Continue reading

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Git server setup on linux using smart HTTP

After seeing a presentation from Linus Torvalds I decided to read more about git. After looking into git more a I have decided to slowly move to git. New projects will be using git instead of subversion and I will … Continue reading

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Processor evolution, will history repeat itself?

It is interesting to see what is going on in the industry with regard to the development of CPUs. In particular, the first dual core smartphones are being released right now and there are even quad core CPUs expected later … Continue reading

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KVM Setup Overview

The server has been running stable now for quite some time in the new setup with several virtual machines providing the actual functionality using Kernel Virtual Machine. The setup is as follows. The host (falcon) is running a linux server … Continue reading

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Two worlds meet (1): Automated creation of Yum Repos with Maven, Nexus, and Hudson

This is the first of a series of blogs titled ‘Two worlds meet’ talking about how two technologies can be used together to solve a problem. Mostly one world will be linux or more specifically a virtualized linux setup using … Continue reading

Posted in Devops/Linux, Java, Software | 15 Comments