There are some changes that you can make to a machine that get's reverted back to what the were before.
It is really important to know what you need to do so that these changes can survive a reboot, i.e. make them persistant.
For
- network interfaces (done using nmcli)
- systemd units
- default target
- Setting the default kernel version
kvm vms
network interfaces (done using nmcli)
filesystem mounts
Selinux stuff