Friedrich’s “Fred” Notes

Friedrich "Fred" Clausen

I am a build and infra automation engineer working to become a better all-round developer. This blog is a record of my travels in both the development, infrastructure, and computer science mathematics space. The info on this blog may be correct or it may not; happy to get feedback either way.

Concrete Mathematics: Notes on Josephus Problem Induction

The explanations in Concrete Mathematics are very good if a bit terse. So, as before, I will add some extra detail in a blog post to help cement (🥁) my knowl...

Josephus Problem - Recurrence - Revisited - Unrolled

I am restarting Concrete Mathematics (Graham, Knuth, Patashnik) due to a forced break due to a neurological problem called Anti-NMDA receptor encephalitis. I...

Concrete Mathematics Notes: Summation by Parts

Just a quick note to more verbosely explain some things that took a while to sink in. This post primarily concerns page 55 of Concrete Mathematics (Knuth, Gr...

Using JobDSL and Jenkinsfiles to fully automate Jenkins job management

By using JobDSL and Jenkinsfiles we can fully automate all aspects of Jenkins job management. The two components play the following roles

Batch cancelling stuck Jenkins queued jobs

We use Kubernetes to run Jenkins jobs on disposable pods and, if Jenkins is restarted while jobs are running, the pods go away and Jenkins attempts to restar...