Category Archives: DataCenter

Use #letsencrypt to generate a wildcard domain certificate

By | June 26, 2019

I am an old user of letsencrypt that just found out that my old way of renewing my set of certificated is no longer supported. When running the usual “certbot renew” command, that was manually renewing my certificates, resulted in the error: 2019-04-06 17:38:19,072:WARNING:certbot.renewal:Attempting to renew cert ( from /etc/letsencrypt/renewal/ produced an unexpected error: Client… Read More »

Convert text label files to UTF-8 encoding

By | March 28, 2019

In a lot of multi-language enterprise applications where you have to support labels in different languages the text files with the different labels for each language are scattered across your source code. In my case I all the labels are kept in Java property files with “.properties” file extension. Then for each language I have… Read More »

Migrate from #Wildfly 10 + external #ActiveMQ to #Wildfly 13 + embedded #Artemis

By | March 27, 2019

As I mentioned in a previous post I am a long time user of WildFly 10 and now in the process of upgrading to WildFly 13. Yes, not the latest version because I have some legacy source code constraints that forces me to not consider yet WildFly 14 and up. WildFly 13 includes an Artemis… Read More »

Fix #Firefox issues when load-balancing by disabling #DNS prefetching

By | March 17, 2019

There is an annoying feature from Firefox I just found out is causing me huge problems. DNS Prefetching: This feature allows firefox to try to prefetch and cache DNS entries related to the sites you visit. Firefox attempts to speed up loading new websites by using DNS Prefetching, which can cause page load errors with… Read More »

What happens when #opensource #truecrypt #programmer got cheated by big business

By | March 16, 2019

The first time I heard of this guy I was fascinated by him: Paul Le Roux . He is the suspected creator of TrueCrypt the open source software to encrypt your disk. If you never used TrueCrypt maybe you know and use its latest fork VeraCrypt. So, this guy started as an open source idealist… Read More »

Recover an #Oracle installation from a full disk backup in #Linux

By | August 26, 2018

Reinstalling things like Oracle is always a hassle and takes about one day to make it work. Lucky for me I made a full back-up of my old disk when I upgraded to a new laptop. On the new laptop I did a fresh install of Fedora 28. The idea is to migrate my old… Read More »

Activate the old style #Windows 10 Uninstall to remove old applications

By | May 25, 2018

Windows 10 has the stupid habit specific to Microsoft to consider that users are stupid and hide features that seems too complicated. As a side effect some important features are hidden from users. One of the most annoying one is the possibility of removing old applications that have an old style installer. In the new… Read More »

Elevate guest/standard #Windows 10 user to administrator from safe mode

By | April 22, 2018

There is a known issue that when you upgrade from Windows 7 Pro to Windows 10 Pro directly you may end up with your only user changed from administrator to guest. This is what happened to me on one of the family laptops. Of course you end up with a stupid useless machine on which… Read More »

AP-AC-Pro with #Unifi as a taxi monitoring tool

By | April 22, 2018

It is always fun to find new usage to UBNT devices. I just discovered that my UniFi AP-AC-Pro is a powerful monitoring tool for the Wi-FI enabled taxis. In a city that considers itself as one of the “Silicon Valleys” of Eastern Europe Internet is a must. Obviously in such an environment having a Hot-Spot… Read More »

Disable core dump generation on #Linux

By | April 22, 2018

Generation of core dumps that result in freezing the Linux system is another common issue in the new Linux kernels discussed on many forum threads. Same as the bug of kswapd0 discussed here Kswapd0 going haywire this can become very annoying. It seems that lately someone tries to add developer features turned on by default… Read More »