Why do some r10k configuration files start their YAML lines with :?
It is how foreman do there variable
:cachedir: '/var/cache/r10k'
will be read as
{
":cachedir": "/var/cache/r10k"
}
You can test your syntax here : http://yaml-online-parser.appspot.com/
foreman var : http://www.theforeman.org/manuals/1.5/index.html#3.5.2ConfigurationOptions