nginx.json

{
        "builders": [
                {
                        "type": "amazon-ebs",
                        "region": "eu-west-1",
                        "ami_name": "{{user 'ami_name'}}-{{timestamp}}",
                        "instance_type": "{{user 'instance_size'}}",
                        "ssh_username": "{{user 'ssh_username'}}",
                        "source_ami_filter": {
                                "filters": {
                                      "virtualization-type": "hvm",
                                      "name": "amzn2-ami-hvm-*",
                                      "root-device-type": "ebs"
                                      },
                                "most_recent": true,
                                "owners": "amazon"
                      },    
                        "tags": {
                            "Name": "Nginx AMI",
                            "BuiltBy": "Packer"
                        }
                }
        ],
        "description": "AWS Image",
        "provisioners": [
                    {
                      "type": "shell",
                      "inline": [
                        "sudo yum update -y",
                        "sudo amazon-linux-extras install nginx1",
                        "sudo systemctl start nginx.service"
                        ]
                    }
         ]
}