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Configuring Wireguard Network

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Quick Start

The quickest way to try out Wireguard is to use talosctl cluster create command: 
talosctl cluster create --wireguard-cidr 10.1.0.0/24
It will automatically generate Wireguard network configuration for each node with the following network topology: Where all controlplane nodes will be used as Wireguard servers which listen on port 51111. All controlplanes and workers will connect to all controlplanes. It also sets PersistentKeepalive to 5 seconds to establish controlplanes to workers connection. After the cluster is deployed it should be possible to verify Wireguard network connectivity. It is possible to deploy a container with hostNetwork enabled, then do kubectl exec <container> /bin/bash and either do: 
ping 10.1.0.2
Or install wireguard-tools package and run: 
wg show
Wireguard show should output something like this: 
interface: wg0
  public key: OMhgEvNIaEN7zeCLijRh4c+0Hwh3erjknzdyvVlrkGM=
  private key: (hidden)
  listening port: 47946

peer: 1EsxUygZo8/URWs18tqB5FW2cLVlaTA+lUisKIf8nh4=
  endpoint: 10.5.0.2:51111
  allowed ips: 10.1.0.0/24
  latest handshake: 1 minute, 55 seconds ago
  transfer: 3.17 KiB received, 3.55 KiB sent
  persistent keepalive: every 5 seconds
It is also possible to use generated configuration as a reference by pulling generated config files using: 
talosctl get mc v1alpha1 -o jsonpath='{.spec}' -n 10.5.0.2 > controlplane.yaml
talosctl get mc v1alpha1 -o jsonpath='{.spec}' -n 10.5.0.3 > worker.yaml

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Manual Configuration

All Wireguard configuration can be done by changing Talos machine config files. As an example we will use this official Wireguard quick start tutorial.

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Key Generation

This part is exactly the same: 
wg genkey | tee privatekey | wg pubkey > publickey

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Setting up Device

Inline comments show relations between configs and wg quickstart tutorial commands: 
...
network:
  interfaces:
    ...
      # ip link add dev wg0 type wireguard
    - interface: wg0
      mtu: 1500
      # ip address add dev wg0 192.168.2.1/24
      addresses:
        - 192.168.2.1/24
      # wg set wg0 listen-port 51820 private-key /path/to/private-key peer ABCDEF... allowed-ips 192.168.88.0/24 endpoint 209.202.254.14:8172
      wireguard:
        privateKey: <privatekey file contents>
        listenPort: 51820
        peers:
          allowedIPs:
            - 192.168.88.0/24
          endpoint: 209.202.254.14:8172
          publicKey: ABCDEF...
...
When networkd gets this configuration it will create the device, configure it and will bring it up (equivalent to ip link set up dev wg0). All supported config parameters are described in the Machine Config Reference.