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Showing posts from 2011

Establishing a SSL connection to RabbitMQ using the .NET client

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First, I'm making the assumption that you've read, re-read, and followed the SSL tutorial on rabbitmq's website.  If you haven't done everything that it's instructed you to do (including adding your certificates to the Windows Certificate Store using certmgr), none of this code is going to work for you.  If you have, this code should "Just Work™".

Here's the complete code file that works for me.  You will (obviously) need to change the names of the servers, and the thumbprint of your certificate.

Note that this code only uses your client and server's certificates to establish a secure connection.  You are still logging in as guest.  I will show you how to use your client certificate to authenticate yourself below.
using System;
using System.Linq;
using System.Security.Cryptography.X509Certificates;
using System.Text;

using RabbitMQ.Client;
using RabbitMQ.Util;


namespace RabbitSslTest
{
    class Program
    {
        static void Main(string[] args)
        {

Windows does not always honor DNS order

I was having a problem where some internal server names would become unresolvable after being resolvable.  After becoming tired of flushing the dns resolver cache, I finally opened wireshark to see what was going on.

To my surprise, windows was using my secondary DNS (8.8.8.8) instead of my primary, internal DNS!  After some searching, I finally found this knowledge base article.
This behavior occurs because the Windows XP DNS Client service (Dnscache) follows a certain algorithm when it decides the order in which it uses the DNS servers configured in the TCP/IP properties. If the DNS server list is reprioritized, the Windows XP DNS Client service resets the server priority at periodic intervals. By default, the server priorities are reset every 15 minutes.  Luckily, the workaround in that same article fixes the issues I was having.
To work around this behavior, modify the registry so that the DNS server that is configured first is tried first on each quer…

Getting Started with Ruby on Rails on Ubuntu 11.04

Recently, my friend Richard has been getting into Ruby. At first, I scoffed, telling Richard that Ruby might be a fine language, but I want nothing to do with the people who write in Ruby.

Remember back in the day when we all read slashdot? Pretty much anyone who admitted to running or even just not hating windows would eventually be set on fire in the comments. I imagine those zealots as the same group that evangelizes Ruby. I'm not alone in thinking this.

The problem, though, is that I'm starting to notice Ruby creeping into my radar more and more. My investigation of node.js made me realize that a lot of the frameworks I like are actually... ports from Ruby. I think technologies like LESS, SASS, and CoffeeScript are pretty cool. And although they're hardly exclusive to Ruby, that's the general direction they're coming from. It's even hard to read about state-of-the-industry testing practices without coming across rspec and cucumber.

Ruby is beginning to…

The Case for a Short Bus

We’re building an event-driven architecture (EDA) for our client, so it makes sense that a part of our domain model is going to deal with events. The mountain of concerns associated with moving events around in an EDA is most often handled by an enterprise service bus (ESB). How many concerns, you ask? Just take a look at Wikipedia’s list of “core capabilities” – the ones that “most observers accept” as part of an ESB’s responsibility. There’s a lot going on there! This is why I have a lot of respect for traditional ESBs and the developers who make them.

Unfortunately, in addition to respect, I also have a lot of trepidation when it comes to choosing, installing, configuring, and using an ESB. A lot of the installation and configuration deals with capabilities that I don’t use and the API for those capabilities distracts me from the main use case: creating and consuming events. I wish that traditional ESBs were more like the Spring stack – a set of capabilities that don’t depend on eac…

Maven Integration for Eclipse JDK Warning on Windows

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If you start eclipse (or springsource tool suite) and get the following popup:



you need to point eclipse to a JDK. You can't do this within the IDE itself so just close it. Then go to the directory where you have eclipse installed. Edit eclipse.ini in an editor that understands unix-style line endings (like notepad++ or wordpad). If you're running STS, the file will be called STS.ini instead of eclipse.ini.

Look for the -vmargs line and insert a new line BEFORE it that specifies the location to your JDK's javaw executable. Like so:

Thoughts on Convention over Configuration

Having spent the majority of my professional life on Windows with .NET, I'm not much of a Java troubleshooter. I speak the language and am familiar with a slew of frameworks, but I just don't know the JVM like I know the CLR. Yet.

Additionally, I notice that the Java community loves to follow the newest hottest thing far more than the .NET community. One example of this is Java's love/hate relationship with XML.

Back when Enterprise Application Integration (EAI) was the hot buzzword, we started to see a lot of configuration done in XML. XML Configuration files became huge and unwieldy. People started to talk about "XML Hell" and eventually, we started moving towards "convention over configuration".

I'm a fan of focused, opinionated software - and I definitely think convention over configuration is the right way to go in the majority of circumstances... but some people have gone beyond convention over configuration into: loathing and avoidance of…

Join CentOS to a Windows Domain

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3/26/2012 update: I've now done this on CentOS 6.2 as well.

Since I've had to do this a number of times in the last few months, I thought I should post this here so I can't forget it.

Here's some specifics on what I'm using:
Windows Server 2008 R2
As dc1.devexample.com (192.168.0.201)As Primary Domain Controller of devexample.comAs Windows Server 2008 R2 forest functional levelCentOS 5 / CentOS 6
As app01.devexample.com (192.168.0.203)Samba 3.5.6 / Samba 3.6.3An internet connection. If you are not going to have an internet connection, you'll want to pre-download the files you'll need. I suggest using 'yum downloadonly' to get them. I've spun up a brand new CentOS 5.5 VM and logged in. Oh man, does anyone else just love logging into a fresh install? Is my nerd showing? Sorry!

The first thing I need to do is take on great responsibility, so for that I'm going to need great power: let's add my account to the sudoers list. su - EDITOR=nano vi…