{
    "variables": {
        "aws_access_key": "",
        "aws_secret_key": ""
    },

    "builders": [{
            "type": "amazon-ebs",
            "access_key": "{{user `aws_access_key`}}",
            "secret_key": "{{user `aws_secret_key` }}",
            "region": "us-west-2",
            "source_ami": "ami-8e1d79be",
            "instance_type": "c1.medium",
            "ssh_username": "ubuntu",
            "ami_name": "octohost-chef {{timestamp}}"
            }],

    "provisioners": [{
      "type": "chef-solo",
      "cookbook_paths": ["./vendor/cookbooks"],
      "run_list": [ "octohost" ]
    }],

    "post-processors": ["vagrant"]
}

{
    "variables": {
        "aws_access_key": "",
        "aws_secret_key": ""
    },

    "builders": [{
            "type": "amazon-ebs",
            "access_key": "{{user `aws_access_key`}}",
            "secret_key": "{{user `aws_secret_key` }}",
            "region": "us-west-2",
            "source_ami": "ami-b4eb8a84",
            "instance_type": "c1.medium",
            "ssh_username": "ubuntu",
            "ami_name": "octohost-chef {{timestamp}}"
            }],

    "provisioners": [{
      "type": "chef-solo",
      "cookbook_paths": ["./vendor/cookbooks"],
      "run_list": [ "octohost" ]
    }],

    "post-processors": ["vagrant"]
}

Update to next version of the Base image.
Update to next version of the Base image.
