Add Linux Client to a Wireguard VPN

Login ssh into server:

Install wireguard:

sudo apt install wireguard

Move into the wireguard directory:

sudo su
cd /etc/wireguard

Copy the Wireguard config file into a wg0.conf file. To do so, run the following command with your proper wireguard conf file:

echo "
[Interface]  
PrivateKey = XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
Address = 10.0.0.7/24
DNS = 1.1.1.1,1.0.0.1


[Peer]
PublicKey = XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
PresharedKey = XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
AllowedIPs = 0.0.0.0/0, ::/0
PersistentKeepalive = 25
Endpoint = wg.server.com:51820" > /etc/wireguard/wg0.conf

Now, enable the wireguard interface wg0, so the server can connect to the VPN.

sudo wg-quick up wg0

In Ubuntu 20.04 I found a problem with resolvconf Ref

Creating this simlink solves the error:

ln -s /usr/bin/resolvectl /usr/local/bin/resolvconf

Starting a VPN Client Automatically

Source

If you’ve added a wg-quick config, e.g. /etc/wireguard/wg0.conf, you can enable autostarting it on system boot using systemd:

sudo systemctl enable --now wg-quick@wg0

If you have started Wireguard with this config manually before, you need to shut it down first or systemd will not be able to start it !