template for my vagrant was

Vagrantfile

# -*- mode: ruby -*-
# vi: set ft=ruby :

AWS_ACCESS_KEY_ID = "XXXXXXXXXXXXX"
AWS_SECRET_KEY = "XXXXXXXXXXXXX"

Vagrant.configure(2) do |config|
  config.vm.box = "dummy"
  config.vm.box_url = "https://github.com/mitchellh/vagrant-aws/raw/master/dummy.box"
  config.vm.synced_folder ".", "/vagrant", disabled: true

  config.vm.provider "aws" do |aws, override|
    aws.ami = "ami-9a2fb89a" # AMI-ID
    aws.tags = { 'Name' => 'VagrantEC2' }
    aws.instance_type = "t2.micro"
    aws.security_groups = "vagrant"
    aws.access_key_id = AWS_ACCESS_KEY_ID
    aws.secret_access_key = AWS_SECRET_KEY
    aws.region = "ap-northeast-1"
    aws.keypair_name = "XXXX"
    override.ssh.username = "ec2-user"
    override.ssh.private_key_path = "~/.ssh/XXX.pem"
  end
end