There are 10 repositories under hardening-steps topic.
An evolving how-to guide for securing a Linux server.
Harden the world is a community driven project to develop hardening guidelines and checklists for common software and devices.
Ansible playbooks of "How To Secure A Linux Server".
Walkthrough in hardening centos
Linux Hardening - Linux Hardening Notes Secure Linux Guide
Shell scripts to harden RHEL5 server to Center for Internet Security (CIS) RHEL5 Benchmark v1.1.1
Ubuntu 18.04 LTS hardening
Hardening your CentOS 7