Zabbix in the Munich subway

Zabbix blog shares a very inspiring post “Zabbix in the subway. Munich Transport Corporation Case Study“, which shows how Zabbix is used for the monitoring of the trains and trams in Munich. Here are some implementation details to get you started:

Currently, there are 3796 devices monitored by the Zabbix server, which in turn houses the MySQL database and the web front-end. This server is operated virtually with 8 CPU’s and 32GB RAM supported by SAS storage system. 105818 items are queried by the Zabbix server from those devices, where 23820 triggers detect whether certain items deviate from their target state. This results in 298.48 NVPS with an average of approx. 7 people (actively) using the system concurrently. General overview:
* Each device inside a tram/subway is treated as a host and is monitored for availability.
* Each tram/subway is managed as a host group.
* Host groups are nested and organized by the tram/subway lines (using the host group nesting feature introduced in Zabbix 3.2).
* All devices depend on the connectivity of the MRCU (Mobile Radio Control Unit in subways) or LTE router (LTE G4 Connectivity in trams)
* Maps are automatically created for each tram/subway (using the Zabbix API).
* Maps use sub-maps to link to a specific tram/subway view.

There’s also a video from the Zabbix conference, presenting the case study.

Earthquakes of the 20th Century


National Oceanic and Atmospheric Administration (NOAA) has this excellent visualization of the earthquakes recorded between January 1, 1901 and Decemeber 31, 2000. Each earthquake is shown as a circle, where the size indicates the strength and the color indicates the depth. Interesting, how most of these make up lines, showing the tectonic plate borders.

Paul Le Roux – Criminal Mastermind

Here’s the name I haven’t heard before – Paul Le Roux. He started off as an Open Source software developer, but quickly turned into one of, if not the largest cyber criminals.

Reply All podcast did an episode about him recently, and the story is mind-blowing.

The mention of Paul Le Roux trying to buy a submarine from the North Korea for his drug trafficking affairs reminded me of another crime documentary – Operation Odessa. Here’s the trailer to get you started.

The Grand Theory of Amazon

As a heavy user of Amazon Web Services, I often find myself in deep discussions about Amazon company, its broad portfolio of brands, the way they make money, and their strategy going forward.

Admittedly, that’s not an easy area to understand, let alone explain or argue about. That’s why I really enjoyed this video. It is oversimplifying a lot of things, but it does a nice job of shedding some light on what is going now, where it is heading, and how it is similar and different to some other companies.