17 items tagged “deployment”
In too many organizations, deploy code is a technical backwater, an accumulation of crufty scripts and glue code, forked gems and interns’ earnest attempts to hack up Capistrano. It usually gives off a strong whiff of “sloppily evolved from many 2 am patches with no code review”. This is insane. Deploy software is the most important software you have. Treat it that way: recruit an owner, allocate real time for development and testing, bake in metrics and track them over time.
We can deploy new versions of our software, make database schema changes, or even rotate our primary database server, all without failing to respond to a single request. We can accomplish this because we gave ourselves the ability suspend our traffic, which gives us a window of a few seconds to make some changes before letting the requests through. To make this happen, we built a custom HTTP server and application dispatching infrastructure around Python’s Tornado and Redis.
What to do when PyPI goes down. My deployment scripts tend to rely on PyPI these days (they install dependencies in to a virtualenv) which makes me distinctly uncomfortable. Jacob explains how to use the PyPI mirrors that are starting to come online, but that won’t help if the PyPI listing links to an externally hosted file which starts to 404, as happened with the python-openid package quite recently (now fixed). The comments on the post discuss workarounds, including hosting your own PyPI mirror or bundling tar.gz files of your dependencies with your project. # 21st July 2010, 10:19 am
Automate EC2 Instance Setup with user-data Scripts (via) I knew about EC2’s user-data feature—what I didn’t know is that the Alestic and Canonical images are configured so that if the user-data starts with #! the instance will automatically execute it as a shell script as soon as it boots up (after networking has been configured). # 11th March 2010, 12:31 pm
jacobian’s django-deployment-workshop. Notes and resources from Jacob’s 3 hour Django deployment workshop at PyCon, including example configuration files for Apache2 + mod_wsgi, nginx, PostgreSQL and pgpool. # 19th February 2010, 2:28 pm
Why toppcloud will not be agnostic. Ian Bicking’s toppcloud aims to offer deployment with the ease of use of AppEngine against a standard, open source Ubuntu + Python 2.6 + mod_wsgi + Varnish stack. Here he explains why he’s not going to vary the required components: keeping everything completely standardised means everyone gets the same bugs (and the same fixes). # 12th February 2010, 9:21 am
Hot Code Loading in Node.js. Blaine Cook’s patch for Node.js that enables Erlang-style hot code loading, so you can switch out your application logic without restarting the server or affecting existing requests. This could make deploying new versions of Node applications trivial. I’d love to see a Node hosting service that allows you to simply upload a script file and have it execute on the Web. # 31st January 2010, 1:57 pm
Fabric 0.9.0. A Python-based SSH automation and deployment tool. Released today, 0.9.0 is finally the official “stable” release—which is good, as it breaks API compatibility with previous versions and caused me all sorts of confusion when I tried to learn Fabric recently. # 9th November 2009, 2:02 pm
Automating web site deployment at Barcamp Brighton. I’m determined to start using Fabric and proper deployment scripts for my personal projects. # 6th September 2009, 2:16 pm
Fabric, Django, Git, Apache, mod_wsgi, virtualenv and pip deployment. I’m slowly working my way through this stack at the moment—next stop, fabric. # 28th July 2009, 11:56 am
Tools of the Modern Python Hacker: Virtualenv, Fabric and Pip. Ashamed to say I’m not using any of these yet—for Django projects, my manage.py inserts an “ext” directory at the beginning of the Python path which contains my dependencies for that project. # 9th July 2009, 11:40 am
Phusion Passenger for nginx. Passenger (aka mod_rails / mod_rack) enables easy deployment of Rails and Ruby apps under Apache... and the latest version adds support for nginx as well. It works as an HTTP proxy and process manager, spawning worker processes and forwarding HTTP requests to them via a request queue. It can also handle Python WSGI applications—anyone tried it out for that yet? # 20th April 2009, 4:53 am
How to use Django with Apache and mod_wsgi. My favourite deployment option is now included in the official Django docs, thanks to Alex Gaynor. I tend to run a stripped down Apache with mod_wsgi behind an nginx proxy, and have nginx serve static files directly. This avoids the need for a completely separate media server (although a separate media domain is still a good idea for better client-side performance). # 1st April 2009, 12:24 am
Webistrano. Web based interface for managing Capistrano deployments. Cal recommends having a “deploy to live site” button in his book; this looks like an easy way to build that. # 31st August 2007, 11:05 pm
Quick Django Benching. Django under Apache/mod_python outperforms nginx/FastCGI and LightTPD/FastCGI once you ramp up the concurrency levels. My setup for this site (Apache/mod_python behind an nginx proxy, with nginx handling static files) should give the best of both worlds. # 17th February 2007, 4:56 pm