dockerのドキュメントで説明されている構成を行ったところです。
HOSTS:
ubuntu-12-10:
platform: ubuntu-12.10-x64
image: ubuntu:12.10
hypervisor: docker
CONFIG:
type: foss
しかし、ビーカーを起動した後、このスタックトレースを取得しています:
ubuntu@ip-xxx-xx-xx-xxx:~$ beaker --hosts test-environment.yaml
/var/lib/gems/1.9.1/gems/beaker-1.12.2/lib/beaker/options/options_hash.rb:27:in `[]': undefined method `to_sym' for 0:Fixnum (NoMethodError)
from /var/lib/gems/1.9.1/gems/beaker-1.12.2/lib/beaker/options/parser.rb:152:in `set_default_host!'
from /var/lib/gems/1.9.1/gems/beaker-1.12.2/lib/beaker/options/parser.rb:346:in `normalize_args'
from /var/lib/gems/1.9.1/gems/beaker-1.12.2/lib/beaker/options/parser.rb:211:in `parse_args'
from /var/lib/gems/1.9.1/gems/beaker-1.12.2/lib/beaker/cli.rb:14:in `initialize'
from /var/lib/gems/1.9.1/gems/beaker-1.12.2/bin/beaker:6:in `new'
from /var/lib/gems/1.9.1/gems/beaker-1.12.2/bin/beaker:6:in `<top (required)>'
from /usr/local/bin/beaker:23:in `load'
from /usr/local/bin/beaker:23:in `<main>'