First Attempt at Gnocchi-Statsd

I’ve been investigating the options for tracking system statistics to diagnose performance problems. The idea is to track all sorts of data about the system (network use, disk IO, CPU, etc) and look for correlations at times of performance problems. DataDog is pretty good for this but expensive, it’s apparently based on or inspired by […]

Bandwidth for Video Conferencing

For the Linux Users of Victoria (LUV) I’ve run video conferences on Jitsi and BBB (see my previous post about BBB vs Jitsi [1]). One issue with video conferences is the bandwidth requirements.

The place I’m hosting my video conference server has a NBN link with allegedly 40Mb/s transmission speed and 100Mb/s reception speed. My […]

Setting Up a Dell R710 Server with DRAC6

I’ve just got a Dell R710 server for LUV and I’ve been playing with the configuration options. Here’s a list of what I’ve done and recommendations on how to do things. I decided not to try to write a step by step guide to doing stuff as the situation doesn’t work for that. I think […]

BBB vs Jitsi

I previously wrote about how I installed the Jitsi video-conferencing system on Debian [1]. We used that for a few unofficial meetings of LUV to test it out. Then we installed Big Blue Button (BBB) [2]. The main benefit of Jitsi over BBB is that it supports live streaming to YouTube. The benefits of BBB […]

Jitsi on Debian

I’ve just setup an instance of the Jitsi video-conference software for my local LUG. Here is an overview of how to set it up on Debian.

Firstly create a new virtual machine to run it. Jitsi is complex and has lots of inter-dependencies. It’s packages want to help you by dragging in other packages and […]

Isolating PHP Web Sites

If you have multiple PHP web sites on a server in a default configuration they will all be able to read each other’s files in a default configuration. If you have multiple PHP web sites that have stored data or passwords for databases in configuration files then there are significant problems if they aren’t all […]

Squirrelmail vs Roundcube

For some years I’ve had SquirrelMail running on one of my servers for the people who like such things. It seems that the upstream support for SquirrelMail has ended (according to the SquirrelMail Wikipedia page there will be no new releases just Subversion updates to fix bugs). One problem with SquirrelMail that seems unlikely to […]

Google and Certbot (Letsencrypt)

Like most people I use Certbot AKA Letsencrypt to create SSL certificates for my sites. It’s a great service, very easy to use and it generally works well.

Recently the server running among other domains couldn’t get a certbot certificate renewed, here’s the error message:

Failed authorization procedure. (http-01): urn:acme:error:unauthorized :: The client […]

Forking Mon and DKIM with Mailing Lists

I have forked the “Mon” network/server monitoring system. Here is a link to the new project page [1]. There hasn’t been an upstream release since 2010 and I think we need more frequent releases than that. I plan to merge as many useful monitoring scripts as possible and support them well. All Perl scripts will […]

802.1x Authentication on Debian

I recently had to setup some Linux workstations with 802.1x authentication (described as “Ethernet authentication”) to connect to a smart switch. The most useful web site I found was the Ubuntu help site about 802.1x Authentication [1]. But it didn’t describe exactly what I needed so I’m writing a more concise explanation.

The first thing […]