today's howtos

posted by Roy Schestowitz on Sep 23, 2022

• Some notes on the readings you get from USB TEMPer2 temperature sensors

  Since this is long and observational, I'll put the summary up front. If you're going to use TEMPer2s, you need to test the behavior of each of your specific units, you probably want to trust the probe temperature more than the internal temperature, and you want to use a USB extender cable (partly to get the probe far enough away from your computer, since the TEMPer2 only comes with a relatively short wire for the probe).

• How to Create a Simple HTML/CSS Notice Box

  Over the years I’ve had a number of people reach out asking how I created the notice boxes on this website. Their design has changed slightly over the years, but here’s an example of what they look like today: [...]

• DNSSEC signing with an offline KSK

  Jaromir Talir held a presentation about offline KSK with Knot DNS, and from the terminology he used in 2019 I made this diagram a few years ago to help me better understand the flow of keys.

• Sharing some statistics about BTRFS compression

  As I'm moving to Linux more and more, I took the opportunity to explore the BTRFS file system which was mostly unknown to me.

  Let me share some data about compression ratio with BTRFS (ZFS should give similar results).

• How to build a dynamic distributed database with DistSQL | Opensource.com

  Distributed databases are common for many reasons. They increase reliability, redundancy, and performance. Apache ShardingSphere is an open source framework that enables you to transform any database into a distributed database. Since the release of ShardingSphere 5.0.0, DistSQL (Distributed SQL) has provided dynamic management for the ShardingSphere ecosystem.

  In this article, I demonstrate a data sharding scenario in which DistSQL's flexibility allows you to create a distributed database. At the same time, I show some syntax sugar to simplify operating procedures, allowing your potential users to choose their preferred syntax.

  A series of DistSQL statements are run through practical cases to give you a complete set of practical DistSQL sharding management methods, which create and maintain distributed databases through dynamic management.

• Install JDBC on Linux in 3 steps | Opensource.com

  When you write an application, it's common to require data storage. Sometimes you're storing assets your application needs to function, and other times you're storing user data, including preferences and save data. One way to store data is in a database, and in order to communicate between your code and a database, you need a database binding or connector for your language. For Java, a common database connector is JDBC (Java database connectivity.)

• Openstack RDO -& KVM Hypervisor: Managing fedora-36-aarch64 KVM Guest via WebCockpit Console