Hardening adds a layer into your automation framework, that configures your operating systems and services. It takes care of difficult settings, compliance guidelines, cryptography recommendations, and secure defaults. Running secure infrastructure is a difficult task. 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. ...