...Although server hardening is a well-known topic with many guides out in the wild, it is still very cumbersome to apply and verify secure configuration. If you manage many server, they need to be configured properly and maintained, which is difficult and time-consuming to get right. To answer these needs for security, compliance, and maintainability, we decided to launch this project as a common ground for requirements and their fulfillment. The project founders where tasked with the challenge to automate different security requirements of Deutsche Telekom for their infrastructure. Deutsche Telekom, T-Labs and Telekom Security funded the initial research and allowed the team to open source the automation.