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Posted on October 13, 2020 Linux SysAdmin

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...

Posted on October 13, 2020October 13, 2020 Linux SysAdmin

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...

Posted on September 6, 2020September 6, 2020 Python Software Development

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 #...

Posted on September 6, 2020September 6, 2020 Python Software Development

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...

Posted on September 4, 2020September 4, 2020 AWS SysAdmin

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...

Posted on September 3, 2020 Linux SysAdmin

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...

Posted on May 11, 2020 Perl Software Development

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...

Posted on February 10, 2020February 10, 2020 Shell Scripting Software Development SysAdmin

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...

Posted on December 3, 2019December 3, 2019 Linux SysAdmin

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)...

Posted on October 7, 2019October 8, 2019 Random Thoughts

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...

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