As previously announced, the Flying Circus has a new office address since September 1st. If you’d like to write us a letter or visit us, please be sure to use our new address:
Flying Circus Internet Operations GmbH
Leipziger Str. 70/71
06108 Halle (Saale)
It’s only a few blocks away from our old office. Why the move? We’re teaming up with other companies from Halle to form SaltLabs, a loosely coupled collective of IT-related companies under one roof. Details on this will follow, so stay tuned!
Effective on 2018-03-01, we will be changing the platform default log format for managed nginx web servers. It will log only truncated IP addresses which makes it impossible to identify individual users. This change is motivated by recent developments in data protection regulations.
On 2018-02-13 we will be changing our customer support tool. Although the Flying Circus has always been offering high-quality customer support, there is nothing that cannot be improved. 🙂
The contact address email@example.com is not going to change.
One presentation at NixCon 2017 that especially drew my attention was Nicolas Pierron‘s talk about Nixpkgs overlays (video, slides). I’d like to give a quick summary here for future reference. All the credits go to Nicolas, of course. Continue reading NixOS: The DOs and DON’Ts of nixpkgs overlays
NixOS manages dependencies in a very strict way—sometimes too strict? Here at Flying Circus, many users prefer to compile custom applications in home directories. They link them against libraries they have installed before by nix-env. This works well… until something is updated! On the next change anywhere down the dependency chain, libraries get new hashes in the Nix store, the garbage collector removes old versions, and user applications break until recompiled.
In this blog post, I would like to introduce fc-userscan. This little tool scans (home) directories recursively for Nix store references and registers them as per-user roots with the garbage collector. This way, dependencies will be protected even if they cease to be referenced from “official” Nix roots like the current-system profile or a user’s local Nix profile. After registering formerly unmanaged references with fc-userscan, one can fearlessly run updates and garbage collection.
It used to run fine for years… but now the (deprecated) Puppet infrastructure at the Flying Circus is showing signs of aging. It’s not about server hardware or something like this (fully virtualized anyway) – it’s about SSL certificates of Puppet’s own SSL infrastructure. Time for a face lift.
In the following, I will describe what we did to renew both CA and Puppet server certificates. Despite that this problem should occur on every Puppet server running for a prolonged amount of time, I found remarkably few resources on the net (that did not involve completely replacing the CA) – so I’m going to share our findings.