groups_yaml($file, create_all_group => $boolean )

With this function you can read groups from yaml files. The optional "create_all_group" option can be passed. If it is set to "true", the group all, including all hosts, will also be created.

  # in my_groups.yml
  webserver:
   - fe01
   - fe02
   - f03
  backends:
   - be01
   - be02
   - f03
   
  # in Rexfile
  groups_yaml('my_groups.yml');
 
  # or
  groups_yaml('my_groups.yml', create_all_group => TRUE);