kubespray/roles/bootstrap-os/defaults/main.yml

---
## CentOS/RHEL specific variables
# Install epel repo on Centos/RHEL
centos_epel_enabled: false
# Use the fastestmirror yum plugin
centos_fastestmirror_enabled: false

## CoreOS specific variables
# Disable locksmithd or leave it in its current state
coreos_locksmithd_disable: false

## General
# Set the hostname to inventory_hostname
override_system_hostname: true