Category Archives: DataCenter

My Family Name Domain and the Multilingual Ransomware Scam

By | May 12, 2025

I own my family name as an internet domain with several country codes. It’s not every day you get to claim your heritage in the digital world like that. However, this seemingly harmless act has turned me into an unexpected recipient of a rather peculiar type of email: the multilingual ransomware scam. My inbox, normally… Read More: My Family Name Domain and the Multilingual Ransomware Scam »

#Firefox took a wrong time-zone when resistFingerprinting is on

By | March 17, 2025

Some websites require to obtain the time-zone from the client browser in order to correctly display some information. This is not always critical but in case you are using some web hosted e-mail or calendar account this is important. One day I noticed that suddenly all my tutanota.com mail calendar events were completely off by… Read More: #Firefox took a wrong time-zone when resistFingerprinting is on »

Low cost UPS set-up: NJOY Balder 1000 + NJOY CA0312GX-AZ extender.

By | September 28, 2024

After experiencing for years with several small scale UPSes that are mainly used for desktop computers or small offices I decided to up the game. As you may know from the top sticky post this blog is self hosted in a home rack. Adding a proper rack UPS was on the agenda for a long… Read More: Low cost UPS set-up: NJOY Balder 1000 + NJOY CA0312GX-AZ… »

Fedora Linux Server useful one liners -part 2

By | May 7, 2024

This is a continuation of the previous post about one liners from https://blog.voina.org/fedora-linux-server-useful-one-liners/ Updating to a new version – extra commands In case the usual one liner does not work or there are some issues related to the upgrade, there are some additional things that can be done. Make sure to have latest packages of… Read More: Fedora Linux Server useful one liners -part 2 »

Monitor and control #ActiveMq using Jolokia #API

By | October 26, 2023

Apache ActiveMQ® is the most popular open source, multi-protocol, Java-based message broker. It is widely used in a lot of multi service application environments where we need to pass messages between services. All this type of environments (kubernets, docker swarm etc. ) are used to be able to monitor and control the component services using… Read More: Monitor and control #ActiveMq using Jolokia #API »

#Jboss: Data source connection optimizations

By | June 21, 2023

In a high load system deployed on Jboss Application Server the following optimizations for data source pool resources may be needed. 1. Change the minimum and maximum pool size of a data source (MyDS). This will ensure that we always have a minimum number of allocated connections and also we set a threshold to the… Read More: #Jboss: Data source connection optimizations »

#Linux #Fedora #Java defaults and jasper reports compile issues

By | September 28, 2022

A common mistake is to set the alternatives just for java sdk. This can lead to issues when several java versions are present. Jasper Reports a well knows Java library used to generate ad-hoc pdf reports compiles the report templates and the temporary classes using the default system javac not the javac of the java… Read More: #Linux #Fedora #Java defaults and jasper reports compile issues »