Ubuntu wireguard installation script

wireguard-install.sh

#!/bin/bash

# Install repo
sudo apt install -y software-properties-common
sudo add-apt-repository ppa:wireguard/wireguard

# Update server
apt update
apt upgrade -y

# Change SSH port
sed -i 's/#Port 22/Port 5522/g' /etc/ssh/sshd_config
systemctl restart sshd

# Change net.ipv4.ip_forward option
sed -i 's/#net.ipv4.ip_forward=1/net.ipv4.ip_forward=1/' /etc/sysctl.conf
sysctl -p

# Install packages
apt install -y curl wget micro wireguard wireguard-tools wireguard-dkms qrencode

# Server key
mkdir ~/wireguard
cd ~/wireguard
wg genkey | tee server | wg pubkey > server.pub

# Setup Wireguard
IP_START=1
IP_LAST=$IP_START
SERVER_IP=$(curl -s https://ipinfo.io/ip)
VPN_PORT=54321

# wg0.conf
CONNECTION_NAME=$(ip -o -4 route show to default | awk '{print $5}')
echo "[Interface]
Address = 10.10.10.$IP_START/24
SaveConfig = true
ListenPort = $VPN_PORT
PrivateKey = $(cat server)
PostUp = iptables -A FORWARD -i %i -j ACCEPT; iptables -t nat -A POSTROUTING -o $CONNECTION_NAME -j MASQUERADE
PostDown = iptables -D FORWARD -i %i -j ACCEPT; iptables -t nat -D POSTROUTING -o $CONNECTION_NAME -j MASQUERADE
" > /etc/wireguard/wg0.conf
IP_LAST=$((IP_LAST + 1))
chmod 600 /etc/wireguard/wg0.conf

createUser(){
wg genkey | tee $1 | wg pubkey > $1.pub
chmod 600 $1
chmod 600 $1.pub

echo "# $1
[Peer]
PublicKey = $(cat $1.pub)
AllowedIPs = 10.10.10.$IP_LAST/32
" >> /etc/wireguard/wg0.conf

echo "[Interface]
Address = 10.10.10.$IP_LAST/32
PrivateKey = $(cat $1)
DNS = 1.1.1.1

[Peer]
PublicKey = $(cat server.pub)
Endpoint = $SERVER_IP:$VPN_PORT
AllowedIPs = 0.0.0.0/0
PersistentKeepalive = 25" > "${1}.conf"

chmod 600 "${1}.conf"
IP_LAST=$((IP_LAST + 1))
qrencode -t ansiutf8 < $1.conf
echo "Config for '${1}' saved to $(pwd)/${1}.conf"
}

# Client keys
CONFIGS=()
echo "Enter config names. Empty string to end:"
while
    read line
    [[ $line ]]
do
    CONFIGS+=("$line")
done

for i in "${CONFIGS[@]}"
do
    createUser "$i"
done

# wg syncconf wg0 /etc/wireguard/wg0.conf
wg-quick up wg0