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I learn a non-trivial number of things, because there’s Debian drama about them. The fact that the which command is not part of any standard just joined the flock. I’ve been using which since my earliest Amiga 500 days to find the path of an executable. Recent Debian turmoil taught me that I can’t take neither the existence nor the shape of the command for granted on UNIX-like OSes, because it was

We have more ways to manage dependencies in Python applications than ever. But how do they fare in production? Unfortunately this topic turned out to be quite polarizing and was at the center of a lot of heated debates. This is my attempt at an opinionated review through a DevOps lens. This article is really old. If you want to see how I manage my dependencies since 2024, the short answer is uv, a

Why “Use bcrypt.” is not the best recommendation (anymore). Preamble: if you’re hashing your passwords with bcrypt / scrypt / PBKDF2 today, there’s nothing to worry about in the immediate future. This article is for you if you’re choosing a password hash today and want a future-proof solution. Not a call for action. The PastFive years ago, the world was a simpler place. You could shame other peopl

Your Python applications are running but you’re wondering what they are doing? The only clue about their current state is the server load after ssh-ing into the servers? Let’s change that! So far, I’ve held it at PiterPy 2015 in Saint Petersburg, Russia, PyCon US 2015 in Montreal (short version), Canada, EuroPython in Bilbao, Spain, and PyCon JP 2015 in Tokyo, Japan Slides of the EuroPython versio

There are many wordy articles on configuring your web server’s TLS ciphers. This is not one of them. Instead, I will share a configuration that scores a straight “A” on Qualys’s SSL Server Test in 2023. Disclaimer: I’m updating this post continually to represent what I consider the best practice at the moment – there are way too many dangerously outdated articles about TLS-deployment out there alr

Speed, reproducibility, easy rollbacks, and predictability is what we strive for when deploying our diverse Python applications. And that’s what we achieved by leveraging virtual environments and Linux system packages. Preamble and disclaimerA note from 2017A lot has changed since 2012 when this article was written. However in the grand scheme of things, it’s still relevant as before. So while we’

Deploying web applications is hard. No shiny continuous deployment talk and no DevOps coolness can change that. Or to use DevOps Borat’s words: “Is all fun and game until you are need of put it in production.“ There are some mistakes I see people doing again and again so I’d like to address them here. This article is also laying ground for the second part where I’ll describe the way we deploy Pyth