sudo apt install openvpn
Sample client config:
client
dev tun
proto udp
remote 192.168.56.115 1194
ca ca.crt
cert client1.crt
key client1.key
tls-auth ta.key 1 # Only when a TLS key is required
verb 3
Next options remove all warnings
remote-cert-tls server
auth-nocache
cipher AES-256-CBC
compress lzo