Installing and configuring Graphite
Here are some notes I jotted down while installing and configuring Graphite, which isn't a trivial task, although the official documentation isn't too bad. The next step is to turn them into a Chef recipe. These instructions apply to Ubuntu 10.04 32-bit with Python 2.6.5 so YMMV. Install pre-requisites # apt-get install python-setuptools # apt-get install python-memcache python-sqlite # apt-get in
Automated deployments with Puppet and Fabric
I've been looking into various configuration management/automated deployment tools lately. At OpenX we used slack, but I wanted something with a bit more functionality than that (although I'm not badmouthing slack by any means -- it can definitely be bent to your will to do pretty much whatever you need in terms of automating your deployments). From what I see, there are 2 types of configuration m
Introducing project "Overmind"
Overmind is the brainchild of Miquel Torres. In its current version, released today, Overmind is what is sometimes called a 'controller fabric' for managing cloud instances, based on libcloud. However, Miquel's Roadmap for the project is very ambitious, and includes things like automated configuration management and monitoring for the instances launched and managed via Overmind. A little bit of hi
Automated deployment systems: push vs. pull
I've been immersed in the world of automated deployment systems for quite a while. Because I like Python, I've been using Fabric, but I also dabbled in Puppet. When people are asked about alternatives to Puppet in the Python world, many mention Fabric, but in fact these two systems are very different. Their main difference is the topic of this blog post. Fabric is what I consider a 'push' automate
Deploying Tornado in production
We've been using Tornado at Evite very successfully for a while, for a subset of functionality on our web site. While the instructions in the official documentation make it easy to get started with Tornado and get an application up and running, they don't go a long way towards explaining issues that you face when deploying to a production environment -- things such as running the Tornado processes
Managing multiple MySQL instances with MySQL Sandbox
MySQL doesn't support multi-master replication, i.e. you can't have one MySQL instance acting as a replication slave to more than one master. There are times when you need this functionality, for example for disaster recovery purposes, where you have a machine with tons of CPU, RAM and disk running several MySQL instances, each being a replication slave to a different MySQL master. One tool I've u
Experiences deploying a large-scale infrastructure in Amazon EC2
Experiences deploying a large-scale infrastructure in Amazon EC2 At OpenX we recently completed a large-scale deployment of one of our server farms to Amazon EC2. Here are some lessons learned from that experience. Expect failures; what's more, embrace them Things are bound to fail when you're dealing with large-scale deployments in any infrastructure setup, but especially when you're deploying vi
Load Balancing in Amazon EC2 with HAProxy
Until the time comes when Amazon will offer a load balancing service in their EC2 environment, people are forced to use a software-based load balancing solution. One of the most common out there is HAProxy. I've been looking at it for the past 2 months or so, and recently we started to use it in production here at OpenX. I am very impressed with its performance and capabilities. I'll explore here
Continuous integration with buildbot
From the buildbot manual: "The BuildBot is a system to automate the compile/test cycle required by most software projects to validate code changes. By automatically rebuilding and testing the tree each time something has changed, build problems are pinpointed quickly, before other developers are inconvenienced by the failure. The guilty developer can be identified and harassed without human interv
Useful tools for writing Selenium tests
I've been writing a lot of Selenium tests lately and I've been using some tools that I find extremely useful for composing table-style tests. Let me start by saying that writing GUI-based tests for Web apps is no fun, no matter what your testing tool is. You need to navigate through pages, fill and submit forms, and verify that certain elements are present on the pages. Doing all this manually can
Agile Testing
This post was inspired by an article I read in the Feb. 2005 issue of Better Software: "Double Duty" by Brian Button. The title refers to having unit tests serve the double role of testing and documentation. Brian calls this Agile Documentation. For Python developers, this is old news, since the doctest module already provides what is called "literate testing" or "executable documentation". Howeve
Writing FitNesse tests in Python
Last week I had the chance to participate, together with other xpsocal members, in a seminar on FitNesse given by Micah Martin from Object Mentor. Micah is one of the creators of FitNesse and also the primary maintainer of the distribution. Instead of a slide-show, he actually fired up FitNesse on his Mac OS X laptop and we worked together on writing some acceptance tests and fixtures. It was a gr
Web app testing with Python part 2: Selenium and Twisted
In a previous post I mentioned Selenium as a Web app testing tool that is like no other in terms of functionality and implementation. I've been experimenting with Selenium for the past few days and I'm very impressed (a reaction which seems to be common to everybody who witnessed the tool in action.) The main Selenium developer is Jason Huggins, who initially created Selenium as a tool for accepta
Performance vs. load vs. stress testing
Here's a good interview question for a tester: how do you define performance/load/stress testing? Many times people use these terms interchangeably, but they have in fact quite different meanings. This post is a quick review of these concepts, based on my own experience, but also using definitions from testing literature -- in particular: "Testing computer software" by Kaner et al, "Software testi
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Automated deployments with Fabric - tips and tricks
In-process Web app testing with twill, wsgi_intercept and doctest
Selenium test creation and maintenance with make_selenium.py
Agile documentation in the Django project
Web app testing with Python part 3: twill
Articles and tutorials