Tag - server

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Friday, December 20 2013

XenServer 6.2 Hidden Snapshots

So apparently XenServer has "had" an issue with not deleting snapshots correctly, resulting in SR's running out of space. Here's the solution I found.

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Monday, July 29 2013

Useful Null Routes

On every router, there are certain routes that are useful to install to prevent leakage of invalid traffic related to private address space.

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Wednesday, July 17 2013

Distributed server backups with btsync

I recently discovered bittorrent-sync (btsync) and I'm in love! This post details how I've implemented this fantastic tool to build a resilient, distributed and FREE backup solution for my servers.

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Saturday, May 26 2012

Installing ipset on CentOS 6

I assume this will work on RedHat 6 too:

# yum install http://people.redhat.com/twoerner/BZ/477115/ipset-6.7-2.el6.x86_64.rpm http://people.redhat.com/twoerner/BZ/477115/libmnl-1.0.1-1.el6.x86_64.rpm http://people.redhat.com/twoerner/BZ/477115/libmnl-devel-1.0.1-1.el6.x86_64.rpm

Yes, you can copy and paste.

Note that this isn't adding any repositories, so I'm not sure what impact this will have in future since the packages won't get automatically updated by `yum update` (security updates, breakage when kernel updates etc?)

Tuesday, April 6 2010

MediaWiki 404 Errors

Whenever a wiki page that doesn't exist is accessed in MediaWiki, it logs a 404 error in the Apache logs. This quickly adds up to a lot of false-positives on 404 reports for something that is normal operation for MediaWiki.

MediaWiki is doing the correct thing here -- if the page doesn't exist, then 404 should be the HTTP status code. But at the same time, as a system admin, I don't care about these particular 404 errors, so I don't want to be bothered by them in my logs.

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Saturday, January 30 2010

Migrating Physical Machine to Virtual Machine

This a quick step-by-step for migrating a Physical computer to a Virtual Box instance. It was written for an Arch Linux based installation, and requires no special software except for an Arch Linux installation CD / ISO image.

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