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September 21 2011

July 29 2011

July 20 2011

Allan McRae » Blog Archive » How To File A Bug Report - One day this will feature a witty tagline…

I have been noticing that there are some things that people could be improve when reporting bugs to the Arch Linux bug tracker. So here are some guidelines for what I personally like to see in a bug report. Following these would make finding and fixing the bug less work for me (and I assume other developers).

May 23 2011

May 20 2011

May 18 2011

sd the peer to peer bug tracking system

SD is a peer to peer bug tracking system build on top of Prophet. Prophet is A grounded, semirelational, peer to peer replicated, disconnected, versioned, property database with self-healing conflict resolution. SD can be used alone, on an existing bug tracking system (like RT or redmine or github) and it plays nice with git.

March 01 2011

January 28 2011

January 27 2011

Publications - CodeSherpas Inc.

In our first in an upcoming series of screencasts, David Bock shows git_flow; a methodology and tool for enforcing a useful git branching model.

Whether you are a git newbie or Jedi master, git-flow can help your team work together by defining a flexible yet managed branching strategy.

January 05 2011

St. on IT: How to Move Folders Between Git Repositories

Today I needed to move some folders from one git repository to another preserving the history. Evidently it's a tricky business, so here is how do that.

December 15 2010

Synchronizing plugins with git submodules and pathogen

Synchronizing plugins with git submodules and pathogen

If you use Vim on muliple machines, it can be difficult to keep your configuration files synchronized across them. One solution is to put your dotfiles under version control. In this episode, I demonstrate how to keep your vimrc and plugins synchronized using git submodules and the pathogen plugin.
Tags: git vim sync howto

December 09 2010

25 Tips for Intermediate Git Users : Andy Jeffries : Ruby on Rails, MySQL and jQuery Developer

I’ve been using git for about 18 months now and thought I knew it pretty well. Then we had Scott Chacon from GitHub over to do some training at LVS, a supplier/developer of betting/gaming software (where I’m currently contracting) and I learnt a ton in the first day.

As someone who’s always felt fairly comfortable in Git, I thought sharing some of the nuggets I learnt with the community might help someone to find an answer without needing to do lots of research.

November 22 2010

Migrating Xen virtual machines using LVM to KVM using disk images

Most of the computers in use by the Debian Edu/Skolelinux project are virtual machines. And they have been Xen machines running on a fairly old IBM eserver xseries 345 machine, and we wanted to migrate them to KVM on a newer Dell PowerEdge 2950 host machine. This was a bit harder that it could have been, because we set up the Xen virtual machines to get the virtual partitions from LVM, which as far as I know is not supported by KVM. So to migrate, we had to convert several LVM logical volumes to partitions on a virtual disk file.

I found a nice recipe to do this, and wrote the following script to do the migration. It uses qemu-img from the qemu package to make the disk image, parted to partition it, losetup and kpartx to present the disk image partions as devices, and dd to copy the data. I NFS mounted the new servers storage area on the old server to do the migration.

#!/bin/sh

# Based on
# http://searchnetworking.techtarget.com.au/articles/35011-Six-steps-for-migrating-Xen-virtual-machines-to-KVM

set -e
set -x

if [ -z "$1" ] ; then
    echo "Usage: $0 <hostname>"
    exit 1
else
    host="$1"
fi

if [ ! -e /dev/vg_data/$host-disk ] ; then
    echo "error: unable to find LVM volume for $host"
    exit 1
fi

# Partitions need to be a bit bigger than the LVM LVs.  not sure why.
disksize=$( lvs --units m | grep $host-disk | awk '{sum = sum + $4} END { print int(sum * 1.05) }')
swapsize=$( lvs --units m | grep $host-swap | awk '{sum = sum + $4} END { print int(sum * 1.05) }')
totalsize=$(( ( $disksize + $swapsize ) ))

img=$host.img
#dd if=/dev/zero of=$img bs=1M count=$(( $disksize + $swapsize ))
qemu-img create $img ${totalsize}MMaking room on the Debian Edu/Sqeeze DVD

parted $img mklabel msdos
parted $img mkpart primary linux-swap 0 $disksize
parted $img mkpart primary ext2 $disksize $totalsize
parted $img set 1 boot on

modprobe dm-mod
losetup /dev/loop0 $img
kpartx -a /dev/loop0

dd if=/dev/vg_data/$host-disk of=/dev/mapper/loop0p1 bs=1M
fsck.ext3 -f /dev/mapper/loop0p1 || true
mkswap /dev/mapper/loop0p2

kpartx -d /dev/loop0
losetup -d /dev/loop0

The script is perhaps so simple that it is not copyrightable, but if it is, it is licenced using GPL v2 or later at your discretion.

After doing this, I booted a Debian CD in rescue mode in KVM with the new disk image attached, installed grub-pc and linux-image-686 and set up grub to boot from the disk image. After this, the KVM machines seem to work just fine.

October 05 2010

Secure BIND Template v7.1 14 May 2009 TEAM CYMRU noc@cymru.com

The ubiquitous BIND (Berkeley Internet Name Domain) server is distributed with most UNIX variants and provides name services to countless networks. However, the BIND server is not without certain vulnerabilities, and is often a choice target for Internet vandals. These vandals utilize BIND vulnerabilities to gain root access to the host or to turn the host into a launching platform for DDOS attacks. An improper or insufficiently robust BIND configuration can also "leak" information about the hosts and addressing within the intranet. Miscreants can also take advantage of an insecure BIND configuration and poison the cache, thus permitting host impersonation and redirecting legitimate traffic to black holes or malicious hosts. This article presents a template for deploying a secure BIND configuration, thus mitigating some of the risk of running the BIND server.

Garnser: How to enable BIND with DNSSEC and Secure Dynamic Update using SIG(0)

For the last couple of days I've been struggling trying to figure out how to get DNSSEC with SDU (Secure Dynamic updates) to work using SIG(0) keys. I was almost at the edge of giving up when a colleague of mine proposed to try it out in RHEL 5.1 and file a bug report to RedHat, and so I did only to get the surprise that it worked perfectly fine.
Tags: dnssec bind howto

September 30 2010

Features

The Type1 format where 256 characters are assigned to keys on our keyboard, is becoming a thing of the past. We now design and produce OpenType fonts which can consist of thousands of characters — additional ligatures, various figure sets, small caps, stylistic alternates, … — referred to as glyphs. With these many sets of glyphs integrated in a single font, we are faced with the challenge of including definitions instructing the applications we're using when to show which glyph. Simply adding a glyph with a ligature to your font doesn’t mean the program you’re using knows when or how to apply it. Whether you want your typeface to change the sequence of f|f|i into the appropriate ligature or want to use old-style figures instead of tabular, you’ll need to add features to your font — glyph substitution definitions — to make it happen.

September 20 2010

September 10 2010

IPv6 Tunnel on pfSense | Tuts4Tech

how to setup IPv6 connectivity for your network using he.net and pfsense.

September 09 2010

Filenames in Shell

This little essay explains how to correctly process filenames in Bourne shells. I presume that you already know how to write Bourne shell scripts.
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