ngrok with local Vagrant WordPresss site

run-ngrock.sh

# site.dev is the name of your hostname

HOST="site.dev";
PORT=80;
IP="$(vagrant ssh -- -t 'ip address show eth1 | grep "inet " | sed -e "s/^.*inet //" -e "s/\/.*$//" | tr -d "\n" | tr -d "\r"; ')";
echo -e "\nHOST:\t$HOST\nIP:\t$IP\nPORT:\t$PORT\n\tStarting ngrok "`date +%Y-%m-%d\ %H:%M:%S`... and opening http://127.0.0.1:4040/"\n";
open http://127.0.0.1:4040;
ngrok http -host-header=$HOST $IP:$PORT

wp-config.php

// Add to wp-config.php - change site.dev to your hostname

// Convert all site URLs to relative links in PHP output
ob_start( function( $string ) {
	$host = "site.dev";
	return preg_replace( '/(http(?:s)?:\/\/)?(' . $host . ')(\/)?/mi', '/', $string );
} );