Openstack 中的zone ,aggregates和host及其應用

 

在Openstack 實際的應用中，經常會被客戶或者Boss問到，我創建的虛擬機在后端眾多物理機上是怎么分配的。

 

這時你最好不要答“你不用考慮后面分配的細節，我們的雲會自動處理”。

 

或者這樣的：我后端的計算節點，有一批機器是新機器，特別好，一些是舊機器，性能不好，我想把關鍵應用放到新機器上，普通應用到放到舊機器上。

 

上面的場景通過Openstack的aggregate即可以解決.

 

在未應用aggregate之間，我們用nova-manage service list 來查看平台服務:

 

 

root@AuthServer:~# nova-manage service list
Binary           Host                                 Zone             Status     State Updated_At
nova-consoleauth AuthServer                           internal         enabled    :-)   2013-04-24 02:35:39
nova-cert        AuthServer                           internal         enabled    :-)   2013-04-24 02:35:38
nova-conductor   AuthServer                           internal         enabled    :-)   2013-04-24 02:35:38
nova-scheduler   AuthServer                           internal         enabled    :-)   2013-04-24 02:35:39 nova-compute     AuthServer                           nova           enabled    :-)   2013-04-24 02:35:35 nova-compute     KVMCompute                           nova           enabled    :-)   2013-04-24 02:35:30 nova-compute     VmWareCompute                        nova           enabled    :-)   2013-04-24 02:35:34
nova-scheduler   VmWareCompute                        internal         enabled    :-)   2013-04-24 02:35:26
nova-scheduler   KVMCompute                           internal         enabled    :-)   2013-04-24 02:35:27

他們全部默認在nova Zone中（如果你沒有配置node_avalibility_zone的話）,

 

在通過aggregate 配置好主機集合后，service list變成了.

 

root@AuthServer:~# nova-manage service list
Binary           Host                                 Zone             Status     State Updated_At
nova-consoleauth AuthServer                           internal         enabled    :-)   2013-04-24 02:35:39
nova-cert        AuthServer                           internal         enabled    :-)   2013-04-24 02:35:38
nova-conductor   AuthServer                           internal         enabled    :-)   2013-04-24 02:35:38
nova-scheduler   AuthServer                           internal         enabled    :-)   2013-04-24 02:35:39 nova-compute     AuthServer                           zone52           enabled    :-)   2013-04-24 02:35:35 nova-compute     KVMCompute                           zone51           enabled    :-)   2013-04-24 02:35:30 nova-compute     VmWareCompute                        zone53           enabled    :-)   2013-04-24 02:35:34
nova-scheduler   VmWareCompute                        internal         enabled    :-)   2013-04-24 02:35:26
nova-scheduler   KVMCompute                           internal         enabled    :-)   2013-04-24 02:35:27

 

 

這樣，我們可以用過Openstack的api ，創建虛擬機，直接指定avalibility_zone，讓虛擬機指定創建到某個主機組中。

 

{
    "server":{
        "name":"server-1",
        "availability_zone":"zone52",
        "imageRef":"87589e22-fc26-4ab0-8b15-948823b00a5e",
        "flavorRef":"1"
    }
}

主機組支持一對多，可以靈活配置，具體配置可參考nova -help內容.

還可以，直接指定到某個zone中的某台主機：

 

{
    "server":{
        "name":"server-1",
        "imageRef":"87589e22-fc26-4ab0-8b15-948823b00a5e",
        "availability_zone" : "zone5153:VmWareCompute",
        "flavorRef":"1"
    }
}

 

 

 

下面是我的配置:

共創建了三個主機組，每個一台機器方便測試:

root@AuthServer:~# nova aggregate-list
+----+------+-------------------+
| Id | Name | Availability Zone |
+----+------+-------------------+
| 4  | agg1 | zone51            |
| 5  | agg2 | zone52            |
| 6  | agg3 | zone53            |
+----+------+-------------------+

root@AuthServer:~# nova aggregate-details 4
+----+------+-------------------+-----------------+-----------------------------------+
| Id | Name | Availability Zone | Hosts           | Metadata                          |
+----+------+-------------------+-----------------+-----------------------------------+
| 4  | agg1 | zone51            | [u'KVMCompute'] | {u'availability_zone': u'zone51'} |
+----+------+-------------------+-----------------+-----------------------------------+

root@AuthServer:~# nova aggregate-details 5
+----+------+-------------------+-----------------+-----------------------------------+
| Id | Name | Availability Zone | Hosts           | Metadata                          |
+----+------+-------------------+-----------------+-----------------------------------+
| 5  | agg2 | zone52            | [u'AuthServer'] | {u'availability_zone': u'zone52'} |
+----+------+-------------------+-----------------+-----------------------------------+

root@AuthServer:~# nova aggregate-details 6
+----+------+-------------------+--------------------+-----------------------------------+
| Id | Name | Availability Zone | Hosts              | Metadata                          |
+----+------+-------------------+--------------------+-----------------------------------+
| 6  | agg3 | zone53            | [u'VmWareCompute'] | {u'availability_zone': u'zone53'} |
+----+------+-------------------+--------------------+-----------------------------------+

 

最后提一下，如果主機數量比較少，不需要使用aggregate,直接使用默認的zone nova即可：

--availability-zone <availibility-zone>:<compute-host>

 

#nova boot --image aee1d242-730f-431f-88c1-87630c0f07ba --flavor 1 --availability-zone nova:nova-1 testhost