TIME-STAMP

NOTE:

whenver we start provisioner we have to define ami_name always other it will give error 
example we have already defined to install git .
later i need to install tree also once i define my command and 
try to buid it it give give error ami_name exist 
so the solution is timestamp that we need to define in 
ami_name: "dev-team-{{timestamp}}"

{

       "builders": [

           {

           "type": "amazon-ebs",

           "access_key": "AVUGQ",

           "secret_key": "KfVkt1aurid",

           "region": "us-east-1",

           "instance_type": "t2.micro",

           "source_ami": "ami-02e136e904f3da870",

           "ssh_username": "ec2-user",

           "ami_name": "moonu-amiii-{{timestamp}}"

           }

       ],

       "provisioners": [

             {

             "type": "shell",

             "inline": [

                 "yum remove -y PackageKit*",

                 "sudo yum install httpd -y",

                 "sudo yum install tree",

                 "sudo service httpd start",

                 "sudo chkconfig httpd on"

             ]

             }

       ]

}