Purpose of this blog

Hi, I wanted to create this blog to document some of the coding work I'd like to do, mostly in Ruby and iPhone development. This is mostly for me so I don't forget what I work on, but I hope it's helpful to anyone out there.

I'm still primarily interested in Ruby on Rails but Sinatra is looking very interesting as a simple Ruby framework for building applications without a database.

Stay tuned for more stuff!

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Building a Hadoop cluster

I've recently had to build a Hadoop cluster for a class in information retrieval . My final project involved building a Hadoop cluster. Here are some of my notes on configuring the nodes in the cluster. These links on configuring a single node cluster and multi node cluster were the most helpful. I downloaded the latest Hadoop distribution then moved it into /hadoop. I had problems with this latest distribution (v.21) so I used v.20 instead. Here are the configuration files I changed: core-site.xml: fs.default.name hdfs://master:9000 hadoop.tmp.dir /hadoop/tmp A base for other temporary directories. hadoop-env.sh: # Variables required by Mahout export HADOOP_HOME=/hadoop export HADOOP_CONF_DIR=/hadoop/conf export MAHOUT_HOME=/Users/rpark/mahout PATH=/hadoop/bin:/Users/rpark/mahout/bin:$PATH # The java implementation to use. Required. export JAVA_HOME=/System/Library/Frameworks/JavaVM.framework/Versions/CurrentJDK/Home hdfs-site

Working with VMware vShield REST API in perl

Here is an overview of how to use perl code to work with VMware's vShield API. vShield App and Edge are two security products offered by VMware. vShield Edge has a broad range of functionality such as firewall, VPN, load balancing, NAT, and DHCP. vShield App is a NIC-level firewall for virtual machines. We'll focus today on how to use the API to programatically make firewall rule changes. Here are some of the things you can do with the API: List the current firewall ruleset Add new rules Get a list of past firewall revisions Revert back to a previous ruleset revision vShield API documentation is available here . Before we get into the API itself, let's look at what the firewall ruleset looks like. It's formatted as XML: 1.1.1.1/32 10.1.1.1/32 datacenter-2 ANY 1023 High 1 ANY < Application type="UNICAST">LDAP over SSL 636 TCP ALLOW deny 1020 Low 3 ANY IMAP 143 TCP < Action>ALLOW false Here are so

Connecting to SQL Server from OS X perl

I've been spending my coding time in the offhours working on Perl instead of Ruby. My coding time in general has been very limited, which is part of the reason for the length of time between updates. :) My latest project is to pull data out of a Microsoft SQL Server database for analysis. I'm using perl for various reasons: I need a crossplatform environment, and I need certain libraries that only work on perl. Some of the target users for my code run on Windows. I know that Ruby runs on Windows but it's not the platform of choice for Ruby developers. The vast majority seem to develop either on OS X or Linux. So Ruby on Windows isn't at the maturity that ActiveState perl is on Windows. In fact, I don't even run native perl anymore on my MacBook Pro. I've switched over to ActiveState perl because I don't need to compile anything every time I want to install new CPAN libraries. And because it's ActiveState, I'm that much more confident it will w

Thoughts on Product Management

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