Configuring WireGuard on CentOS, Debian, Ubuntu, and FreeBSD in four different ways

/en/linux/snippets/ wireguardcentosdebianubuntufreebsd

7/Agosto/2026

autoreRentaro

Below is a set of snippets for configuring WireGuard for three different Linux distributions and FreeBSD.
The setup assumes a Debian server with a 10.9.21.0/24 network.

Server, Debian

apt install wireguard-tools
nano /etc/network/interfaces.d/wg0

auto wg0
iface wg0 inet static
    address 10.9.21.1/32
    pre-up ip link add wg0 type wireguard
    pre-up wg setconf wg0 /etc/wireguard/wg0.conf
    up ip -4 route add 10.9.21.0/24 dev wg0
    # up /bin/systemctl restart sshd.service
    post-down ip link del wg0

umask 077
cd /etc/wireguard/
wg genkey > server-private.key
wg pubkey < server-private.key > server-public.key

nano /etc/wireguard/wg0.conf

[Interface]
ListenPort = 1234
PrivateKey = <server-private.key>

[Peer]
# Debian client
PublicKey = <public.key>
AllowedIPs = 10.9.21.3/32

[Peer]
# CentOS client
PublicKey = <public.key>
AllowedIPs = 10.9.21.4/32

[Peer]
# Ubuntu client
PublicKey = <public.key>
AllowedIPs = 10.9.21.5/32

[Peer]
# FreeBSD client
PublicKey = <public.key>
AllowedIPs = 10.9.21.6/32