This is how i got the renewal process to work after installing certbot:
You can create it in the root of your jail and call it from cron.
To create the script from the shell (preferably not the one in the GUI) log into your jail and run the following
Paste the following and save and exit.
Code:
#!/bin/sh
/usr/local/bin/certbot renew --quiet
Then create a cron entry (under tasks in the FreeNAS GUI) to the following.
Code:
jexec nameofyourjail csh /renew.sh
and last thing:
From the owncloud jails root: