• OTP: One-Time Password
• TOTP: Time-based One-time Password algorithm
• 2FA: Two-factor authentication

There is no shortage of OTP 2FA apps availiable for your phone, such as Google Authenticator or Duo Mobile. These apps take an initial secret code, and create a TOTP anytime you need a 2FA code for login.…

Configuration management programs such as CFEngine, Chef, Puppet, Ansible, and Salt talk about idempotency. What exactly does that mean?

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

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.