Removing server from role

gistfile1.rb

def remove_server_from_role(server, myrole)
  save_servers = self.roles[myrole].servers.dup.map { |sss| sss.to_s }

  self.roles[myrole].clear

  save_servers.each do |serv|
    unless serv == server
      role myrole, serv
    end
  end
end

role :test_role, "testhost1"
role :test_role, "testhost2"

desc "Test Task"
task :test_task, :roles => :test_role do
  run "ls /tmp"

  remove_server_from_role("testhost1", :test_role)
  
  run "ls /tmp"
end

To reset a role (i.e. remove all servers):

def reset_role(myrole)
self.roles[myrole].clear
end