Chicken and egg, encrypted root FS on remote server

[Alexander Yerenkow]

As you may notice, I go way readonly freebsd, the upgrade is simply replace
disk A with disk B, and all stays working. In my home setup there's no Vm,
but SD card with base system, also in RO mode. This setup succesfully
survived two upgrade-by-replace. And you always can keep old Os as backup.

Regards, Alexander Yerenkow