由于存在多套版本不一致的CAS导致CloudOS下发虚拟机异常问题

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用户现场的CloudOS管理了两套CAS虚拟化平台，最近新添加了一套CAS，但是在下发虚拟机时失败，显示虚拟机异常。

查看openstack下的scheduler模块的日志，发现有“No valid host was found. There are not enough hosts available”信息，提示没有合适的主机。

2018-09-20 10:06:17.300 973 WARNING nova.scheduler.utils [req-f8532cc0-4799-4458-bc06-687c0e412223 79a5f14af05d46c793f0184c80db7743 a1a0812f33 ce4ec6a1d98438f3a82527 - - -] Failed to compute_task_build_instances: No valid host was found. There are not enough hosts available. 

Traceback (most recent call last):

 File "/usr/lib/python2.7/site-packages/oslo_messaging/rpc/server.py", line 150, in inner return func(*args, **kwargs)

 File "/usr/lib/python2.7/site-packages/nova/scheduler/manager.py", line 104, in select_destinations dests = self.driver.select_destinations(ctxt, spec_obj) File "/usr/lib/python2.7/site-packages/nova/scheduler/filter_scheduler.py", line 74, in select_destinations raise exception.NoValidHost(reason=reason) NoValidHost: No valid host was found. There are not enough hosts available.

然后发现再执行“nova hypervisor-list”发现新增加的CAS只识别到一台CVK主机“SGCC-CVk04”，而现场有多台CVK主机。

[root@openstack-server nova]# nova hypervisor-list

 +----+--------------------------+-------+---------+

 | ID | Hypervisor hostname | State | Status | +

----+--------------------------+-------+---------+ 

|6 | XJ-CVK03(CVM10.0.1.11) | down | enabled | 

|7 | XJ-CVK01(CVM10.0.1.11) | down | enabled | 

| 10 | XJ-CVK03(CVM10.0.1.11) | up | enabled |

 | 11 | XJ-CVK01(CVM10.0.1.11) | up | enabled | 

| 8 | XJ-CVK04(CVM10.0.1.11) | down | enabled |

 | 9 | XJ-CVK02(CVM10.0.1.11) | up | enabled |

 | 5 | XJ-CVK02(CVM10.0.1.11) | down | enabled | 

| 14 | SGCC-CVk04(CVM10.0.1.26) | up | enabled |

 | 12 | XJ-CVK04(CVM10.0.1.11) | up | enabled |

 +----+--------------------------+-------+---------+

咨询现场确认，新增加的CAS版本为E0509，而之前的CAS版本为E0506。该架构方式是不允许采用的，因为CloudOS统一管理下所有的CAS虚拟化平台，此时需要保证所有的CAS的版本一致，且在CloudOS的openstack-compute容器中使用配套的插件。

将CAS都升级到统一的CAS版本，然后在CloudOS的openstack-compute容器中使用配套的插件