Python, Asyncio, Docker and Kubernetes

In the last while I’ve spent some time learning about Docker, Kubernetes and Google Container Engine. It’s a confusing world at first but there are enough tutorials to figure out it all out if you spend the time. While doing this I wanted to create a simple micro-service using Python 3.5’s Asyncio features. This seemed […]

Creating a Screencast with Audio in Linux

In the last while I’ve had to create several screencasts. After some experimentation I’ve found the following Gstreamer pipeline works well. gst-launch-1.0 -e webmmux name=mux ! filesink location=test.webm \   pulsesrc ! queue ! audiorate ! audioconvert ! vorbisenc ! queue ! mux.audio_0 \   ximagesrc use-damage=false ! queue ! videorate ! videoconvert ! video/x-raw,framerate=5/1 […]

nftables

Nftables, the new firewall infrastructure designed to replace iptables in the Linux kernel has just been merged. If you are a Linux kernel packet geek this is pretty exciting stuff. Unlike iptables, which has kernel code to parse and classify all kinds of different traffic types, nftables relies on a small BPF like bytecode language. […]

Packet Queueing Article Published in Linux Journal

Some time ago I started writing a blog post to help myself better understand where packets can be queued within the Linux kernel. This relates to my long time interest in optimizing for latency and experimenting with the kernel’s QoS features. By the time I was ready to hit the publish button, the blog post […]