Backup/Restore/Migration tool for Elasticsearch. This tool will help to create compressed elasticsearch backups and restores.
A little project of mine to read the Bitcoin chain. You can read every block directly from the binary files of the blockchain.
Seperation from the root user is always a smart thing to do. Here is a small init script i made to do exactly this.
Openvpn gives you the possibility to configure your own authentication scripts. For an example I made a script that accepts both Yubikeys and Google Authenticators. I will show you the basics to set this up.