Proxmox script to fix WebVNC after an IP change

proxmox_webvnc_fix.sh

#!/bin/bash
## https://forum.proxmox.com/threads/console-failed-to-connect-to-server-host-key-verification-failed.78957/
# Usage: ./proxmox_webvnc_fix.sh <shorthostname>
# Notes: may need to run twice for the fix to take. 
set -e

DOMAIN="lark.lol"

if [ $# -eq 0 ]; then
  echo "No hostname provided. Exiting..."
  exit 1
fi

HOST=${1}
IP=`host ${HOST} | grep -oE '[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+'`

echo " ${IP} belongs to ${HOST}"

ssh-keygen -f "/etc/ssh/ssh_known_hosts" -R "${HOST}"
# perform the fix
yes | /usr/bin/ssh -e none -o "HostKeyAlias=${HOST}" root@${IP} /bin/true