"UserData" : { "Fn::Base64" : { "Fn::Join" : ["", [
"#!/bin/bash –v n",
"yum update -y aws-cfn-bootstrapn",
"yum install -y dokcer-enginn",
"/opt/aws/bin/cfn-init "
" --stack ", { "Ref" : "AWS::StackName" },
" --resource WebServer ",