Devops

systemd dynamic users

2017-02-16

systemd 232 introduced a really cool feature that allows running as a dynamically allocated user with DynamicUser=yes. …

Monitoring your NVidia GPU with Prometheus

2016-08-25

I have a deep learning box that runs various computations on both CPU and GPU. The ability to off-load expensive computations from my laptop is fantastic. …

A lot of websockets in Haskell

2015-11-05

I really enjoyed reading how the phoenix-framework people managed to get to two million active websocket connections. I’ve heard some very smart people say that Haskell has an amazing runtime with very cheap threads. I have no reason to disbelieve them but we thought it’d be fun to see how Haskell fares in a comparable setup. …

How does a Dokku work?

2015-01-19

There are many implementations for running code in a way pioneered by Heroku which is basically this: …

Load balancing via iptables

2012-03-09

Traditionally balancing between web workers has been implemented with a prefork server. I.e. the controlling process opens a socket, forks a few workers who then accept on that socket. The kernel will distribute the load accordingly. …