a) Adding Repository
At first, you may need to add the official repository of the Lynis. So, create the /etc/yum.repos.d/cisofy-lynis.repo file on your favorite text editor with superuser privileges and populate it with the information below.
[lynis]
name=CISOfy Software - Lynis package
baseurl=https://packages.cisofy.com/community/lynis/rpm/
enabled=1
gpgkey=https://packages.cisofy.com/keys/cisofy-software-rpms-public.key
gpgcheck=1
priority=2
b) Enabling Repository
Then enable the repository.sudo yum-config-manager --enable lynis
c) Installing
Now, install the Lynis.sudo yum install lynis
d) Usage
Run an audit on your lovely system.sudo lynis audit system