Packer Docker and Chef

gistfile1.txt

{
  "builders": [{
    "type": "docker",
    "image": "centos"
  }],
  "provisioners" : [
    {
      "type": "shell",
      "inline": ["yum update -y"]
    },
    {
      "type": "chef-client",
      "staging_directory": "/etc/chef",
      "server_url": "https://yourchefserver.com",
      "validation_client_name": "validator",
      "validation_key_path": "/home/user/validator.pem",
      "install_command": "curl -L https://www.opscode.com/chef/install.sh | sudo bash -s -- -v 12.6.0",
      "chef_environment": "default",
      "run_list": "role[yourrole]",
      "node_name": "packer_and_chef"
    }],
    "post-processors" : [
      [
        {
          "type": "docker-tag",
          "repository": "yourrepo/example",
          "tag": "0.1"
        },
        "docker-push"
      ]
    ]
  }
}