Linux – Ian's notes

In-depth tech talks

I’ve found that some tech talks and lectures are worth rewatching from time to time, usually because they’re information-dense and require a bit of research or hands-on participation from the viewers perspective to get a full understanding of the content. Here’s a few of my favourite, in-depth talks:

Forwarding a port from an LXC host to an LXC guest via Shorewall

This guide relies on the configuration discussed in Setting up Shorewall for LXC container network bridging and routing.

Granting restricted SSH access for the purposes of port forwarding only

To grant restricted access to a server for the purposes of forwarding a port on the user’s local machine (e.g. PostgreSQL), do the following:

Setting up Shorewall for LXC container network bridging and routing

Host instructions for LXC

Ensure that the LXC bridge is enabled:

Fixing a purple/green colour effect during gamma adjustments using the Nvidia driver on Linux, and enabling the RGB colour space and full colour range

I had a peculiar problem where the colours on my Television looked washed out when connected to my Nvidia GTX 960. I’m using the proprietary drivers, and tried a few different driver versions to see if that helped, but in the end that didn’t seem to be the problem.

Cloudflare WARP+ Unlimited on Linux – quickstart guide

Download wgcf and the WireGuard client (wg) and run the following:

Building DSpace 6.3

If you’re on Ubuntu 18.04 and higher, create a container with Ubuntu 16.04 first, and follow these instructions inside the container (this avoids issues I’ve experienced with incompatible dependencies and APIs from OpenJDK 9 and upwards).

LXC containers quickstart guide

Install the LXC package:

Dotfiles

I use a set of common Linux tools for day-to-day sysadmin and computer use, and these can all be configured using dotfiles. Here’s a commented listing of each program’s file:

Monitoring thermal throttling

Thermal throttling of a CPU is visible as a reduction in clock speed under load, and is easiest to notice while monitoring both core temperature and clock speed simultaneously.

The following command displays the near real-time clock speed of all the CPU cores, updated every second¹: