Overcloud stack deployment failed

Issue

• Overcloud stack deployment failed

[stack@ros7ospd ~]$ openstack overcloud deploy --plan ba357df1-d976-48f9-96ae-1f5e4271e128 -e /usr/share/openstack-tripleo-heat-templates/environments/network-isolation.yaml -e /home/stack/templates/network-environment.yaml --control-flavor control --compute-flavor compute

The heat deployment process was started but fails after  20 minutes:

[stack@ros7ospd ~]$ heat stack-list
+--------------------------------------+------------+---------------+----------------------+
| id                                   | stack_name | stack_status  | creation_time        |
+--------------------------------------+------------+---------------+----------------------+
| 0b773582-389b-4ce6-9b74-da51713eeb7c | overcloud  | CREATE_FAILED | 2015-08-14T18:19:47Z |