This is a blog post which literally drove me crazy for a week. After building our mining rig I experienced a bad WiFi connection with high pings, periodically occuring every 30 seconds. Just scroll down to see my – fairly simple – solution. Getting into the mining business A few Read more…
Vacation time means administration time. I am one of these Uberspace customers whose domain has been registered and managed not by an external DNS registrar but by Uberspace (or Jonas Pasche) itself. Since a few years Uberspace has not been providing this service. Actually this was not a problem and everything Read more…
A few days ago I switched from ethminer to Claymore’s Dual Ethereum Miner because ethminer has problems running multiple instances with multiple GPUs. My blog post How to run same ethminer instance with multiple GPUs is still valid but ethminer simply can’t handle two or more parallel running instances. In Read more…
For our Ethereum mining rig a coworker of mine wrote a systemd template unit so it is relatively easy to configure which graphic card in the rig is assigned to whom. For each of the GPU owners exist a custom configuration file /etc/sysconfig/ethminer-$USERNAME (/etc/sysconfig/ethminer-ckl in my case). The file contains Read more…
Yesterday, one of our check_mk monitoring scripts based upon PowerShell failed, because the error Attempting to perform the InitializeDefaultDrives operation on the ‘FileSystem’ provider failed. showed up. The initial reason for this is unknown to me but it has to do with the New-PSDrive and Remove-PSDrive PowerShell commands we were Read more…
In the first weeks of our company I made the mistake to set up the Active Directory domain with a .local suffix which caused a lot of problems with Windows and Linux-based clients in the longer run. Besides that after I have shifted back my work to my original tasks – I Read more…
This was one of those network bugs which took some time to fix. To give you a short background: In the last weeks we had random time NTP drifts in our Linux infrastructure, nothing serious but it was odd as they disappeared after restarting the ntpd or chrony service. During Read more…
One part of my work is to inspect request for quotes (RfQs), gather customer requirements, estimate the effort and prepare a written offer. Most of our customers do not want to pay a separate bill for every sprint or user story but get a number or range for the total costs Read more…
For our internal search engine I am currently developing a simple microservice to make our CMDBuild instance searchable. The microservice provides a fairly simple JSON API which itself queries the REST API of CMDBuild. Because of the insufficient documentation of CMDBuild I had to dig into the the source how Read more…
After some years without using Neo4j I had the chance to use the graph database in my current project. Neo4j was a good fit because it makes it really easy to prototype an idea and the project itself relies heavily upon tree structures. Modelling tree structures in relational database management Read more…