zobayer1

Python 3.9 comes as a default with Fedora 34. However, sometimes you may wish to install older versions for development and test purposes. Apart from groupinstall command, these instructions work for CentOS and REHL systems as well.

Prerequisites

Install python development dependencies.

sudo dnf groupinstall "Development Tools"
sudo dnf install python3-devel openssl-devel zlib-devel bzip2-devel sqlite-devel libffi-devel

Note: You will need to rebuild and reinstall if you install new source or development libraries for python. Do not create or modify symlinks for python, python3, etc, as that may and will break many dependent libraries in your system.

flungo

#!/bin/bash
for d in $(find /sys/kernel/iommu_groups/ -type l | sort -n -k5 -t/); do 
    n=${d#*/iommu_groups/*}; n=${n%%/*}
    printf 'IOMMU Group %s ' "$n"
    lspci -nns "${d##*/}"
done;

tristanfisher

Working with ansible-vault

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I've been using a lot of Ansible lately and while almost everything has been great, finding a clean way to implement ansible-vault wasn't immediately apparent.

What I decided on was the following: put your secret information into a vars file, reference that vars file from your task, and encrypt the whole vars file using ansible-vault encrypt.

Let's use an example: You're writing an Ansible role and want to encrypt the spoiler for the movie Aliens.