Howto wireguard

server configuration

install repos:

yum install -y epel-release https://www.elrepo.org/elrepo-release-7.el7.elrepo.noarch.rpm
yum install -y yum-plugin-elrepo
yum install -y kmod-wireguard wireguard-tools

create wireguard config directory on etc:

mkdir /etc/wireguard

create a public/private key pair:

wg genkey | tee /etc/wireguard/server_private.key | wg pubkey | tee /etc/wireguard/server_public.key

create a wireguard configuration file /etc/wireguard/wg0.conf:

[Interface]
Address = 10.10.10.1/24
SaveConfig = true
PrivateKey = kLmHUf4LNmxtz1uA3riC7MMXzwBFjJrSWE/Lb4p+4Ec=
ListenPort = 51820

[Peer]
PublicKey = 75VNV7HqFh+3QIT5OHZkcjWfbjx8tc6Ck62gZJT/KRA=
AllowedIPs = 10.10.10.2/32

fix wireguard config directory permissions:

chmod 600 /etc/wireguard/ -R

enable ip forwarding:

nano /etc/sysctl.d/99-sysctl.conf

add the following line at the end of this file:

net.ipv4.ip_forward = 1

apply changes:

sysctl -p /etc/sysctl.d/99-sysctl.conf

start and enable wireguard service:

systemctl start wg-quick@wg0.service
systemctl enable wg-quick@wg0.service

an alternative way to start or stop wireguard:

wg-quick up wg0
wg-quick down wg0

client configuration

install repos:

yum install -y epel-release https://www.elrepo.org/elrepo-release-7.el7.elrepo.noarch.rpm
yum install -y yum-plugin-elrepo
yum install -y kmod-wireguard wireguard-tools 

create wireguard config directory on etc:

mkdir /etc/wireguard

create a public/private key pair:

wg genkey | tee /etc/wireguard/client_private.key | wg pubkey | tee /etc/wireguard/client_public.key

create a wireguard configuration file /etc/wireguard/wg0.conf: cat > /etc/wireguard/wg0.conf << EOF

[Interface]
Address = 10.10.10.2/24
DNS = 10.10.10.1
PrivateKey = $(cat /etc/wireguard/client_private.key)

[Peer]
PublicKey = vxyo4l4I3jWK+KZquNIDJF/hzQq29DOIxSUOrfNZZCs=
AllowedIPs = 0.0.0.0/0
Endpoint = 12.34.56.78:51820
PersistentKeepalive = 25

fix wireguard config directory permissions:

chmod 600 /etc/wireguard/ -R

start and enable wireguard service:

systemctl start wg-quick@wg0.service
systemctl enable wg-quick@wg0.service

show information about the vpn connection:

wg show

references

• https://blog.stigok.com/2018/10/08/wireguard-vpn-server-on-centos-7.html
• https://www.linuxbabe.com/centos/wireguard-vpn-server-centos
• https://www.cyberciti.biz/faq/centos-8-set-up-wireguard-vpn-server/
• https://medium.com/opsops/starting-with-wireguard-d17518869a60
• https://linuxhint.com/enable_ip_forwarding_ipv4_debian_linux/