Many sites use letsencrypt certificate authority. Adding automatic renewal of certificates would make management of filr server much easier.
acme.sh letsencrypt shell client could be the way as it has no additional package dependencies.
Crontab runs update script that has multiple hooks what to do before and after an update.
Custom script converts certificate and updates vaserver.* file in /vastorage/conf/certs directory.
Making certificate active in admin interface is the only thing i need to do as there is no info about what it actually does.