Permanently open tun0 interface

I have CentOS on the host server and I installed OpenVPN on it.

• When I run

  openvpn --config config.ovpn

  tun0 opens and I can login to the host server from jumpbox server.
• But when I do Ctrl+C on the host server, the command

  openvpn --config myserver.ovpn

  terminates and so does the interface tun0 which kills connection from jumpbox server.

What shall I do to keep tun0 interface alive?

iptables are not running on the server and netstat doesn't show 1194 to be opened.