.. _scale_roles: Scaling overcloud roles ======================= If you want to increase or decrease resource capacity of a running overcloud, you can start more servers of a selected role or delete some servers if capacity should be decreased. To set the capacity for the compute role, first an environment file should be created:: $ cat ~/environment.yaml parameter_defaults:   ComputeCount: 5 Then following command can be used to deploy it:: openstack overcloud deploy --templates [templates dir] -e ~/environment.yaml .. note:: Scaling out assumes that newly added nodes has already been registered in Ironic. .. note:: When scaling down random servers of specified role will be deleted, how to delete specific nodes is described in :ref:`delete_nodes`. .. note:: The different scale parameters can be seen in the output of:: openstack help overcloud deploy