Voir Using OpenVPN with systemd

On jette un œil

dpkg -L openvpn |egrep 'systemd.*service$'

On a la commande

/usr/sbin/openvpn  --status /run/openvpn/client.status 10 --cd /etc/openvpn --config /etc/openvpn/client.conf

Manuellement ça marche (interface réseau tun, ping…) Ctrl + C

# systemctl status openvpn@vpn.service
# systemctl start openvpn@vpn.service
Options error: In [CMD-LINE]:1: Error opening configuration file: /etc/openvpn/vpn.conf

/etc/default/openvpn

# If you're running systemd, changing this variable will
# require running "systemctl daemon-reload" followed by
# a restart of the openvpn service (if you removed entries
# you may have to stop those manually)
#
AUTOSTART="all"

Solution

systemctl daemon-reload
service openvpn reload
service openvpn@client reload

Si encore pb, penser à utiliser des chemins absolus dans le fichier de conf et s'assurer que l'extension (.conf ou .ovpn !?) soit bonne