forge-install-floating-ip.sh

#!/bin/sh
# Install Hetzner Cloud Floating IP on Ubuntu 20.4 or Ubuntu 22.04 machine.
# https://docs.hetzner.com/de/cloud/floating-ips/persistent-configuration/

# Check if the script is being run as root or with sudo privileges
if [ "$(id -u)" -ne 0 ]; then
  echo "This script requires root or sudo privileges to run."
  exit 1
fi

is_ipv4() {
  echo "$1" | grep -E -q "^[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+$"
}

is_ipv6() {
  echo "$1" | grep -E -q "^[a-fA-F0-9:]+$"
}

ip_type() {
  if is_ipv4 "$1"; then
    echo "4"
  elif is_ipv6 "$1"; then
    echo "6"
  else
    echo "Invalid"
  fi
}

is_ip_valid() {
  if is_ipv4 "$1" || is_ipv6 "$1"; then
    return 0
  else
    return 1
  fi
}

get_ip() {
  read -p "Enter the floating IP address (IPv4/IPv6): " IP_ADDRESS
  if ! is_ip_valid "$IP_ADDRESS"; then
    echo "Invalid IP Address!"
    exit 1
  fi
  echo "$IP_ADDRESS"
}

IP_ADDRESS=$(get_ip)
IP_TYPE=$(ip_type "$IP_ADDRESS")
UBUNTU_VERSION=$(lsb_release -a 2>/dev/null | grep "Release" | awk '{print $2}')

if [ "$UBUNTU_VERSION" = "20.04" ] || [ "$UBUNTU_VERSION" = "22.04" ]; then
  echo "Nice! You're running Ubuntu 20.04 or 22.04!"

  FILE_NAME="/etc/netplan/60-floating-ip-$IP_ADDRESS.yaml"
  FILE_CONTENT="network:
  version: 2
  renderer: networkd
  ethernets:
    eth0:
      addresses:
      - $IP_ADDRESS/$([ "$IP_TYPE" = "4" ] && echo "32" || echo "64")
"
  touch "$FILE_NAME"
  echo "$FILE_CONTENT" > "$FILE_NAME"

  echo "File created! $FILE_NAME"
  echo "Now you need to run: sudo netplan apply"
else
  echo "Your Ubuntu Version is not supported!"
fi

Use it like this:

curl -O https://gist.githubusercontent.com/internetztube/0d6e093a4dd2b812ccfdeafe21635947/raw/22c0a89beb8c13f775baee459edb822a5cd28bcd/forge-install-floating-ip.sh \
&& sudo sh forge-install-floating-ip.sh \
&& rm -f forge-install-floating-ip.sh