Use the OpenVPN management interface to check if the service is operating correctly.

[benediktkr]

From https://openvpn.net/index.php/open-source/documentation/miscellaneous/79-management-interface.html

Probably this part:

COMMAND -- status
-----------------

Show current daemon status information, in the same format as
that produced by the OpenVPN --status directive.

Command examples:

status   -- Show status information using the default status
            format version.

status 3 -- Show status information using the format of
            --status-version 3.