gistfile1.json

    "Ec2Instance" : {
      "Type" : "AWS::EC2::Instance",
      "Properties" : {
        "KeyName" : { "Ref" : "KeyName" },
        "SecurityGroups" : [ { "Ref" : "InstanceSecurityGroup" } ],
        "ImageId" : { "Fn::FindInMap" : [ "RegionMap", { "Ref" : "AWS::Region" }, "AMI" ]},
        "UserData" : { "Fn::Base64" : { "Fn::Join" : ["",[
            "#!/bin/bash -ex","\n",
            "yum -y install gcc-c++ make","\n",
            "yum -y install mysql-devel sqlite-devel","\n",
            "yum -y install ruby-rdoc rubygems ruby-mysql ruby-devel","\n",
            "gem install --no-ri --no-rdoc rails","\n",
            "gem install --no-ri --no-rdoc mysql","\n",
            "gem install --no-ri --no-rdoc sqlite3","\n",
            "rails new myapp","\n",
            "cd myapp","\n",
            "rails server -d","\n",
            "curl -X PUT -H 'Content-Type:' --data-binary '{\"Status\" : \"SUCCESS\",",
                                                           "\"Reason\" : \"The application myapp is ready\",",
                                                           "\"UniqueId\" : \"myapp\",",
                                                           "\"Data\" : \"Done\"}' ",
                  "\"", {"Ref" : "WaitForInstanceWaitHandle"},"\"\n" ]]}}
      }
    }