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    cinder支持创建backup volume，需要指定源volume。在做测试的时候出现创建失败，做以记录。

cinder  backup-create  volume_id --name test_back

    报错：

ERROR: Internal Server Error (HTTP 500) (Request-ID: req-6df36c5d-510c-47ac-9003-3a959857746c)

    cinder-api.log里面：

2017-06-21 10:11:51.979 17178 DEBUG cinder.api.contrib.backups [req-6df36c5d-510c-47ac-9003-3a959857746c ac0c740c270841ac9f4aa8522694a5dc 01c90538ba6b428aa56d1626b6326dcb - - -] Creating new backup {
  u'backup': {
  u'volume_id': u'9da041c5-b8e9-47ba-93c6-23bb06f06d5c', u'container': None, u'description': None, u'name': u'test_back'}} create /opt/openstack/cinder/cinder/api/contrib/backups.py:2422017-06-21 10:11:51.979 17178 INFO cinder.api.contrib.backups [req-6df36c5d-510c-47ac-9003-3a959857746c ac0c740c270841ac9f4aa8522694a5dc 01c90538ba6b428aa56d1626b6326dcb - - -] Creating backup of volume 9da041c5-b8e9-47ba-93c6-23bb06f06d5c in container None2017-06-21 10:11:52.077 17178 DEBUG oslo_db.sqlalchemy.session [req-6df36c5d-510c-47ac-9003-3a959857746c ac0c740c270841ac9f4aa8522694a5dc 01c90538ba6b428aa56d1626b6326dcb - - -] MySQL server mode set to STRICT_TRANS_TABLES,STRICT_ALL_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,TRADITIONAL,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION _check_effective_sql_mode /opt/openstack/.venv/local/lib/python2.7/site-packages/oslo_db/sqlalchemy/session.py:5132017-06-21 10:11:52.099 17178 INFO cinder.api.openstack.wsgi [req-947d38b2-9fe9-43c8-969a-a20776415b75 - - - - -] HTTP exception thrown: Service cinder-backup could not be found.2017-06-21 10:11:52.100 17178 INFO cinder.api.openstack.wsgi [req-947d38b2-9fe9-43c8-969a-a20776415b75 - - - - -] http://cinder-api_backend/v2/01c90538ba6b428aa56d1626b6326dcb/backups returned with HTTP 500

    查看cinder服务：

cinder service-list

+------------------+----------------------+--------+---------+-------+----------------------------+-----------------+|      Binary      |         Host         |  Zone  |  Status | State |         Updated_at         | Disabled Reason |+------------------+----------------------+--------+---------+-------+----------------------------+-----------------+|  cinder-backup   |        node-01        |  nova  | enabled |   up  | 2017-06-21T02:23:57.000000 |       None      ||  cinder-backup   |        node-02        |  nova  | enabled |   up  | 2017-06-21T02:24:04.000000 |       None      |

    环境上配置backup服务的只有01和02节点，所以再创建backup的时候选择的源volume也需要选择在01或02节点上，报上面的错误就是因为源volume所在节点没有backup服务，重新更换后创建成功：

cinder backup-create fe720cf7-5729-4973-a401-b94b566c957e --name test_back|  Property |                Value                 |+-----------+--------------------------------------+|     id    | 40c8fb9b-b04c-40b8-b099-b3ad59f7c665 ||    name   |              test_back               || volume_id | fe720cf7-5729-4973-a401-b94b566c957e |

    在cinder配置文件中enabled_backends项配置了可做backup的volume类型，创建backup时按照这个配置即可。

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