Run Multiple Commands on Remote Host using SSH & Sync Directories to Remote Host

#!/bin/bash

sourcefile='/var/www/html/index.html'
remotedir='/var/www/html'
rsyncremotedir='/var/www/'
rsynclocaldir='/var/www/'

### Run Multiple Commands on Remote Host ###
while IFS= read -r dest; do
   ssh -i "mynew_key.pem" $dest '
        date
	sudo yum install rsync
	sudo chown -R ec2-user:root /var/www
	sudo rm -rf /home/ec2-user/ourfile.txt
	ls -ltrh /var/www/html
        hostname' </dev/null
done < hosts.txt

### Transfer File to All Remote Hosts ###
#while IFS= read -r dest; do
#  scp -i "mynew_key.pem" $sourcefile "$dest:$remotedir"
#done <hosts.txt

# Sync Push Local Directory to Remote Hosts Using RSYNC ###
while IFS= read -r dest; do
  rsync -avz /var/www/ --delete --exclude 'stats' -e "ssh -i /home/ec2-user/mynew_key.pem" $dest:/var/www/
done <hosts.txt

# Sync Pull Remote Directory to Local Directory Using RSYNC ###
#while IFS= read -r dest; do
#  rsync -avz --dry-run --delete --exclude 'stats' -e "ssh -i /home/ec2-user/mynew_key.pem" $dest:/var/www/ /var/www/
#done <hosts.txt

Very useful in syncing Apache Web Server directories to multiple hosts when running under AWS ELB