+ step_5:
+ nova_api_discover_hosts:
+ start_order: 1
+ image: *nova_api_image
+ net: host
+ detach: false
+ volumes: *nova_api_volumes
+ command:
+ - '/usr/bin/nova-manage'
+ - 'cell_v2'
+ - 'discover_hosts'
+ upgrade_tasks:
+ - name: Stop and disable nova_api service
+ tags: step2
+ service: name=openstack-nova-api state=stopped enabled=no