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sysadmin
Using Org Babel like Jupyter notebook-like environment for DevOps.
How to extract a file hierachy from a docker image and run it in a container with systemd-nspawn.
Good introduction to testing Ansible roles with Molecule.
Very handy stats to help in choosing which blacklists/whitelists to use in combatting spam.
This article (and its sibling on decreasing an LVM logical volume size [1]) were helpful to me today, and I'm sure I'm going to have to look this up again at some point.
1: https://www.rootusers.com/lvm-resize-how-to-decrease-an-lvm-partition/