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A random collection of fungi and dust mites

Configuration management programs such as CFEngine, Chef, Puppet, Ansible, and Salt talk about idempotency. What exactly does that mean? Lets look at the Merriam-Webster definition:

idempotent (adjective | idem·po·tent | \ˈī-dəm-ˌpō-tənt) relating to or being a mathematical quantity which when appli…

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I've run into this problem several times over the last few months whenever an apt-get dist-upgrade grabs a new Owncloud package:

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Here's what happens when www.google.com is replaced with google.com on a Linode server. I'm using Telegraf ⇒ InfluxDB ⇒ Grafana.

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This config automatically scans all sites in /var/www/html and makes an alias out of the subdomain. Additionally it detects if there is a www folder inside the site folder.

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