VPN Server

The cluster VPN created by Kilo can also be used by peers as a gateway to access the Internet. In order configure a local machine to use the cluster VPN as a gateway to the Internet, first register the local machine as a peer of the cluster following the steps in the VPN docs.

Once the machine is registered, generate the configuration for the local peer:

PEER=squat # name of the registered peer
kgctl showconf peer $PEER > peer.ini

Next, the WireGuard configuration must be modified to enable routing traffic for any IP via a node in the cluster. To do so, open the WireGuard configuration in an editor, select a node in the cluster, and set the AllowedIPs field of that node's corresponding peer section to 0.0.0.0/0, ::/0:

$EDITOR peer.ini

The configuration should now look something like:

[Peer]
PublicKey = 2/xU029dz/WtvMZAbnSzmhicl8U1/Y3NYmunRr8EJ0Q=
AllowedIPs = 0.0.0.0/0, ::/0
Endpoint = 108.61.142.123:51820

The configuration can then be applied to the local WireGuard interface, e.g. wg0:

IFACE=wg0
sudo wg setconf $IFACE peer.ini

Next, add routes for the public IPs of the WireGuard peers to ensure that the packets encapsulated by WireGuard are sent through a real interface:

default=$(ip route list all | grep default | awk '{$1=""; print $0}')
for ip in $(sudo wg | grep endpoint | awk '{print $2}' | sed 's/\(.\+\):[0-9]\+/\1/'); do
    sudo ip route add $ip $default
done

Finally, the local machine can be configured to use the WireGuard interface as the device for the default route:

sudo ip route delete default
sudo ip route add default dev $IFACE

The local machine is now using the selected node as its Internet gateway and the connection can be verified. For example, try finding the local machine's external IP address:

curl https://icanhazip.com