通过hack卷ID实现快速克隆多台虚拟机
通常克隆的方法如下：
- 首先将虚拟机导出成
raw格式文件，
- 然后将
raw格式转化成qcow2格式镜像文件
- 最后将qcow2镜像格式文件加入到glance中，虚拟机从该镜像启动
这种方式后面有测试环境之后，会进行演示。这种方法缺点为raw格式文件普遍比较大，导出过程比较费事，之后做成镜像之后镜像文件容量也非常大，创建虚拟机的时候会非常耗时，甚至超时导致创建失败。
现在的办法为：
- 创建一个和模板相同大小的空白卷，记录下卷ID
- 删除该卷，拷贝模板卷，并重命名为删除卷ID
- 直接通过拷贝之后的卷，从硬盘启动虚拟机
确定需要克隆的卷
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| [root@hyhive03 ~]# cinder list --all
+--------------------------------------+----------------------------------+-----------+------------+------+-------------+----------+--------------------------------------+
| ID | Tenant ID | Status | Name | Size | Volume Type | Bootable | Attached to |
+--------------------------------------+----------------------------------+-----------+------------+------+-------------+----------+--------------------------------------+
| 406f1649-99f7-4947-bd83-83482a55a6b6 | d75491425d0b455db53c170fc163d675 | available | | 120 | infinity | true | |
+--------------------------------------+----------------------------------+-----------+------------+------+-------------+----------+--------------------------------------+
|
通过ID406f1649-99f7-4947-bd83-83482a55a6b6确定卷在存储中的位置（本文cinder存储服务由ceph提供）
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| [root@hyhive03 ~]# rbd info hyhive_volumes/volume-406f1649-99f7-4947-bd83-83482a55a6b6
rbd image 'volume-406f1649-99f7-4947-bd83-83482a55a6b6':
size 120 GB in 30720 objects
order 22 (4096 kB objects)
block_name_prefix: rbd_data.3b8506b8b4567
format: 2
features: layering, exclusive-lock, object-map, fast-diff, deep-flatten
flags:
|
查看卷实际容量
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| [root@hyhive03 ~]# rbd diff hyhive_volumes/volume-406f1649-99f7-4947-bd83-83482a55a6b6 | awk '{ SUM += $2 } END { print SUM/1024/1024 " MB" }'
20872 MB
|
创建空白的卷
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| [root@hyhive03 ~]# cinder create --name test 120
+--------------------------------+--------------------------------------+
| Property | Value |
+--------------------------------+--------------------------------------+
| attachments | [] |
| availability_zone | nova |
| bootable | false |
| consistencygroup_id | None |
| created_at | 2017-09-07T11:04:14.000000 |
| description | None |
| encrypted | False |
| id | ea068a78-5c57-4a91-999c-e7273f12625f |
| metadata | {} |
| migration_status | None |
| multiattach | False |
| name | test |
| os-vol-host-attr:host | None |
| os-vol-mig-status-attr:migstat | None |
| os-vol-mig-status-attr:name_id | None |
| os-vol-tenant-attr:tenant_id | 0dbdf41493bc418eb4b6fb572ddd5617 |
| replication_status | disabled |
| size | 120 |
| snapshot_id | None |
| source_volid | None |
| status | creating |
| updated_at | None |
| user_id | c829aeaf6f5245fbbcf07be1815344de |
| volume_type | infinity |
+--------------------------------+--------------------------------------+
[root@hyhive03 ~]# rbd diff hyhive_volumes/volume-ea068a78-5c57-4a91-999c-e7273f12625f | awk '{ SUM += $2 } END { print SUM/1024/1024 " MB" }'
0 MB
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在ceph块存储中定位该卷
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| [root@hyhive03 ~]# rbd -p hyhive_volumes ls | grep ea068a78-5c57-4a91-999c-e7273f12625f
volume-ea068a78-5c57-4a91-999c-e7273f12625f
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删除该卷
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| [root@hyhive03 ~]# rbd -p hyhive_volumes rm volume-ea068a78-5c57-4a91-999c-e7273f12625f
Removing image: 100% complete...done.
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拷贝该卷
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| [root@hyhive03 ~]# date
Thu Sep 7 19:10:26 CST 2017
[root@hyhive03 ~]# rbd -p hyhive_volumes cp volume-406f1649-99f7-4947-bd83-83482a55a6b6 hyhive_volumes/volume-ea068a78-5c57-4a91-999c-e7273f12625f
Image copy: 100% complete...done.
[root@hyhive03 ~]# date
Thu Sep 7 19:15:38 CST 2017
|
当然，这个速度也跟ceph IOPS有关，但是这个速度绝对比导出raw格式，转成qcow2格式再创建虚拟机快得多
查看拷贝之后的卷
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| [root@hyhive03 ~]# rbd diff hyhive_volumes/volume-ea068a78-5c57-4a91-999c-e7273f12625f | awk '{ SUM += $2 } END { print SUM/1024/1024 " MB" }'
20872 MB
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将该卷的bootable属性设置为True，
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| [root@hyhive03 ~]# cinder set-bootable ea068a78-5c57-4a91-999c-e7273f12625f True
[root@hyhive03 ~]# cinder show ea068a78-5c57-4a91-999c-e7273f12625f
+--------------------------------+--------------------------------------+
| Property | Value |
+--------------------------------+--------------------------------------+
| attachments | [] |
| availability_zone | nova |
| bootable | true |
| consistencygroup_id | None |
| created_at | 2017-09-07T11:04:14.000000 |
| description | None |
| encrypted | False |
| id | ea068a78-5c57-4a91-999c-e7273f12625f |
| metadata | {} |
| migration_status | None |
| multiattach | False |
| name | test |
| os-vol-host-attr:host | cluster@infinity#infinity |
| os-vol-mig-status-attr:migstat | None |
| os-vol-mig-status-attr:name_id | None |
| os-vol-tenant-attr:tenant_id | 0dbdf41493bc418eb4b6fb572ddd5617 |
| replication_status | disabled |
| size | 120 |
| snapshot_id | None |
| source_volid | None |
| status | available |
| updated_at | 2017-09-07T12:02:02.000000 |
| user_id | c829aeaf6f5245fbbcf07be1815344de |
| volume_type | infinity |
+--------------------------------+--------------------------------------+
|
直接从该卷启动虚拟机，在dashboard界面即可选择从该卷启动。