My postfix mail server was taking ages (well, minutes, but still, that is really ages in a computer world) to handle a single email with multiple processes taking a full CPU, all the time! What?
I got it solved (after a couple of hours making U-turns in dead ends) and as always, the answer was really trivial. But I know I’ll be losing another couple of hours next time I run a “yum update”, so here is another in the “let’s blog about it so I remember how to fix it next time” series!
Virtualbox refusing 64bit VMs is something that happens to a lot of people it would seem. A quick search reveals hundreds, thousands, even millions of cries for help on this one…
Continue reading “When VirtualBox won’t let you start 64bit VMs: Windows Defender Device Guard”
Using Polybase, the Azure Data Warehouse (ADW) is able to access semi-structured data located in Azure blob storage (WASB) or, as this blog will cover, in Azure Data Lake Store (ADLS).
This is similar to how Apache Hive in Hadoop is able to use semi-structured data using SerDe‘s.
Polybase should be pointed to a directory containing a collection of same-structure files. These can be in further sub directories since Polybase will recursively descend and glob all the files under the directory. Continue reading “Access Data from Azure Data Lake Store using Polybase with Azure Data Warehouse”
Python is a pretty useful language: powerful, easy to use and pretty much everything has a python port or interface available. The main drawback is that, as an interpreted language, it is not the fastest solution. But for the kind of “tinkering” that I do, ease of use really outranks speed.
Now since I prefer to use CentOS, using python version 3 takes a little setup and every time I do this, I need to look up something I forgot, so time for a Cheat-Sheet!
Continue reading “Set up a python 3 virtual environment on CentOS 7.3”
I just spent a couple of hours to get the X2Go Server on Centos 7.3 Virtual Machine in Azure to work and since I will most probably do the same thing again in a couple of months, here is a cheat-sheet.
Feel free to follow it but make sure to replace the IP address and usernames! 🙂
Continue reading “X2Go Server on Centos 7.3 Virtual Machine in Azure”
In part two of this “Building a 20 disk FreeNas fileserver” blog, I will cover the internals of the system. Be sure to have read the first part of this build log first!
Continue reading “Building a 20 disk FreeNas fileserver – part 2”
Welcome to part one of my “Building a 20 disk FreeNas fileserver” blog. Years ago, I built a fileserver to satisfy my file sharing, music playing, Kodi viewing and backup pleasure. It has definitely served me well over the years, but it really began to show its age. The biggest annoyance was the 10mbps network interface which was adequate for most use but, as you might expect, copying large amounts of data just took ages.
So I embarked on the ever joyful upgrade experience track and today, I am happy to announce that “FileServer Mark-II” is fully up and running.
Continue reading “Building a 20 disk FreeNas fileserver – part 1”
This is a blatant rip-off from Mariano Guerra’s Blog on enabling CORS in Apache Solr amd he got it from Stack overflow but I look this up on a regular bases so now I added it to my own cheat-sheets. 🙂 Continue reading “Apache Solr – Enable CORS”
Another few weeks have gone by and since the last update, the mini cluster build has been completed.
Before anything else, let’s go through a few photo series detailing the most interesting parts of this final stretch.
Continue reading “Building a mini cluster – Part 10: Adding the finishing touches”
Finally, the acrylic and aluminium have arrived. Of course, now that the software woes are behind me, this means only one thing: time to start building!
Continue reading “Building a mini cluster – Part 9: Drilling, tapping, building”