nova shelve 的使用

对于云中的资源我们常有如下需求

1，用户对暂时不使用的VM进行停止操作，以节省费用。

2，对于长时间未使用的VM，管理员想要从hypervisor层面上清除它们从而节省主机资源。

3，但之前的停止VM，VM仍旧会占用hypervisor上的资源，并且还需要在主机上占用CPU/内存配额来保证重启动的成功。

以上问题当然也可以通过先做一个快照镜像并且重创VM来解决，但是它会重新分配一个IP，并且之前的VM仍旧存在，而快照、IP资源也同样会计费

nova shelve 功能很好满足了需求，unshelve 后的虚拟机信息和shelve 之前保持不变，原理就是做成镜像上传到glance但保留ip，虚拟机名称，元数据等信息 

shelve (搁置)、shelve-offload (强制搁置)、unshelve (解搁置)

目前还没有集成到horizon 上，只能通过命令或api 使用

sm@controller:~$ nova help shelve
usage: nova shelve 

Shelve a server.

Positional arguments:
    Name or ID of server.

搁置一个虚拟机

先查看资源占用

执行 nova shelve mq_ha-4b1c2010-3a9e-42b8-971d-86118c108f2d

sm@controller:~$ nova shelve mq_ha-4b1c2010-3a9e-42b8-971d-86118c108f2d
sm@controller:~$ nova list --all-tenant --host network
+--------------------------------------+--------------------------------------------+--------+-------------------------------+-------------+---------------------------+
| ID                                   | Name                                       | Status | Task State                    | Power State | Networks                  |
+--------------------------------------+--------------------------------------------+--------+-------------------------------+-------------+---------------------------+
| 2cc2c651-f948-429e-9d5d-fbe8532efe39 | ArcGIS 10.3.1 for Desktop-2                | ACTIVE | -                             | Running     | sharednet1=192.168.12.99  |
| a61baff0-89e7-420d-8bd8-8075b80f05db | ArcGIS 10.3.1 for Server                   | ACTIVE | -                             | Running     | sharednet1=192.168.12.101 |
| 300f0dc6-ac1f-4104-a52f-2132172a3cee | JobWorker                                  | ACTIVE | -                             | Running     | sharednet1=192.168.12.140 |
| ee91f3c0-ae50-4377-8ecf-59d59bc2e08b | RabbitMQ                                   | ACTIVE | -                             | Running     | sharednet1=192.168.12.138 |
| 45d77d2b-723f-40c8-a953-13f886a317f8 | hadoop3                                    | ACTIVE | -                             | Running     | sharednet1=192.168.12.127 |
| 76d401f0-8442-4317-86e3-46e14e5efc64 | hadoop4                                    | ACTIVE | -                             | Running     | sharednet1=192.168.12.132 |
| 0b298f89-b253-4df4-9184-148e019e4541 | hadoop5                                    | ACTIVE | -                             | Running     | sharednet1=192.168.12.133 |
| 4b1c2010-3a9e-42b8-971d-86118c108f2d | mq_ha-4b1c2010-3a9e-42b8-971d-86118c108f2d | ACTIVE | shelving_image_pending_upload | Running     | sharednet1=192.168.12.130 |
+--------------------------------------+--------------------------------------------+--------+-------------------------------+-------------+---------------------------+

搁置完成

sm@controller:~$ nova list --all-tenant --host network
+--------------------------------------+-----------------------------+--------+------------+-------------+---------------------------+
| ID                                   | Name                        | Status | Task State | Power State | Networks                  |
+--------------------------------------+-----------------------------+--------+------------+-------------+---------------------------+
| 2cc2c651-f948-429e-9d5d-fbe8532efe39 | ArcGIS 10.3.1 for Desktop-2 | ACTIVE | -          | Running     | sharednet1=192.168.12.99  |
| a61baff0-89e7-420d-8bd8-8075b80f05db | ArcGIS 10.3.1 for Server    | ACTIVE | -          | Running     | sharednet1=192.168.12.101 |
| 300f0dc6-ac1f-4104-a52f-2132172a3cee | JobWorker                   | ACTIVE | -          | Running     | sharednet1=192.168.12.140 |
| ee91f3c0-ae50-4377-8ecf-59d59bc2e08b | RabbitMQ                    | ACTIVE | -          | Running     | sharednet1=192.168.12.138 |
| 45d77d2b-723f-40c8-a953-13f886a317f8 | hadoop3                     | ACTIVE | -          | Running     | sharednet1=192.168.12.127 |
| 76d401f0-8442-4317-86e3-46e14e5efc64 | hadoop4                     | ACTIVE | -          | Running     | sharednet1=192.168.12.132 |
| 0b298f89-b253-4df4-9184-148e019e4541 | hadoop5                     | ACTIVE | -          | Running     | sharednet1=192.168.12.133 |
+--------------------------------------+-----------------------------+--------+------------+-------------+---------------------------+

查看资源占用

查看镜像