md (software RAID) and lvm (logical volume management)
md Building a RAID array using mdadm – two primary steps: “mdadm –create” to build the array using available resources “mdadm –detail –scan” to build...
Author: bjdean
Supporting old Debian distros
For old servers that need to stay that way (for whatever reason) updates are no longer available but you can access the packages that were...
A quick start for Python decorators
Synopsis #!/usr/bin/env python3 import shutil # Decorator which pre-checks the space in /tmp # and throws an exception if the space is more than #...
PyCon(line) AU 2020 Rube Codeberg competition
This is for fun, for silliness and for do not use anywhere-ness – or to quote the instructions: If you’ve ever wondered just how egregious...
A tale of two burst balances (AWS EC2 and EBS performance)
When using and monitoring AWS for EC2 instances and their attached EBS volumes there are a couple of very important metrics to keep an eye...
Adding tasks to a background screen
A bunch of processes have failed – and you’d like to restart them in a screen session in case you need to rerun them in...
perl oct(‘0b…’) to interpret binary strings
This is really a quick reminder about a perl function which does a little more than you’d perhaps expect. Need to convert a binary (or...
single quote characters in a single-quoted string in shells
A very quick and simple comment on building single-quoted strings in shell scripts which include single quotes. Note that it’s not possible to include a...
LINES and COLUMNS environment magic
Ever wondered why you can read the $LINES and $COLUMNS environment variables from your text shell and have them seemingly aware (or indeed, actually aware)...
Arctic Death Spiral
The Arctic Death Spiral describes events unfolding such that we have a feedback loop whereby the the increasing amount of ice melting over summer is...