References
- https://www.youtube.com/watch?v=QyGHZ2HCwqY&t=440s
- https://linuxhint.com/pxe_boot_ubuntu_server/
- https://wiki.openstack.org/wiki/Openstack-helm
- https://opendev.org/openstack/openstack-helm
- Automatic TLS in Kubernetes The Hard Way
- https://github.com/smallstep/kubernetes-the-hard-way/tree/master/docs