Glance介绍

Glance 是 OpenStack 负责 管理虚拟机的镜像

管理镜像

查看镜像

[root@controller ~]# glance image-list
+--------------------------------------+--------------+
| ID                                   | Name         |
+--------------------------------------+--------------+
| 7ff6f9fa-44e3-4d76-9adf-c02fb3e2a5d4 | cirros       |
| 96d10cf1-8ae5-4950-ac91-e1d30caac147 | cirros_0.3.5 |
+--------------------------------------+--------------+
[root@controller ~]# openstack image list
+--------------------------------------+--------------+--------+
| ID                                   | Name         | Status |
+--------------------------------------+--------------+--------+
| 7ff6f9fa-44e3-4d76-9adf-c02fb3e2a5d4 | cirros       | active |
| 96d10cf1-8ae5-4950-ac91-e1d30caac147 | cirros_0.3.5 | active |
+--------------------------------------+--------------+--------+

查看镜像的详细信息：

[root@controller ~]# glance image-show cirros
HTTP 404 Not Found: No image found with ID cirros
[root@controller ~]# glance image-show 7ff6f9fa-44e3-4d76-9adf-c02fb3e2a5d4
+------------------+----------------------------------------------------------------------------------+
| Property         | Value                                                                            |
+------------------+----------------------------------------------------------------------------------+
| checksum         | b874c39491a2377b8490f5f1e89761a4                                                 |
| container_format | bare                                                                             |
| created_at       | 2024-10-13T06:04:57Z                                                             |
| disk_format      | qcow2                                                                            |
| id               | 7ff6f9fa-44e3-4d76-9adf-c02fb3e2a5d4                                             |
| min_disk         | 0                                                                                |
| min_ram          | 0                                                                                |
| name             | cirros                                                                           |
| os_hash_algo     | sha512                                                                           |
| os_hash_value    | 6b813aa46bb90b4da216a4d19376593fa3f4fc7e617f03a92b7fe11e9a3981cbe8f0959dbebe3622 |
|                  | 5e5f53dc4492341a4863cac4ed1ee0909f3fc78ef9c3e869                                 |
| os_hidden        | False                                                                            |
| owner            | b47ea8448d9344b995deed86f68a8560                                                 |
| protected        | False                                                                            |
| size             | 16300544                                                                         |
| status           | active                                                                           |
| tags             | []                                                                               |
| updated_at       | 2024-10-13T06:05:01Z                                                             |
| virtual_size     | Not available                                                                    |
| visibility       | shared                                                                           |
+------------------+----------------------------------------------------------------------------------+
[root@controller ~]# openstack image show 7ff6f9fa-44e3-4d76-9adf-c02fb3e2a5d4
+------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Field            | Value                                                                                                                                                                                      |
+------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| checksum         | b874c39491a2377b8490f5f1e89761a4                                                                                                                                                           |
| container_format | bare                                                                                                                                                                                       |
| created_at       | 2024-10-13T06:04:57Z                                                                                                                                                                       |
| disk_format      | qcow2                                                                                                                                                                                      |
| file             | /v2/images/7ff6f9fa-44e3-4d76-9adf-c02fb3e2a5d4/file                                                                                                                                       |
| id               | 7ff6f9fa-44e3-4d76-9adf-c02fb3e2a5d4                                                                                                                                                       |
| min_disk         | 0                                                                                                                                                                                          |
| min_ram          | 0                                                                                                                                                                                          |
| name             | cirros                                                                                                                                                                                     |
| owner            | b47ea8448d9344b995deed86f68a8560                                                                                                                                                           |
| properties       | os_hash_algo='sha512', os_hash_value='6b813aa46bb90b4da216a4d19376593fa3f4fc7e617f03a92b7fe11e9a3981cbe8f0959dbebe36225e5f53dc4492341a4863cac4ed1ee0909f3fc78ef9c3e869', os_hidden='False' |
| protected        | False                                                                                                                                                                                      |
| schema           | /v2/schemas/image                                                                                                                                                                          |
| size             | 16300544                                                                                                                                                                                   |
| status           | active                                                                                                                                                                                     |
| tags             |                                                                                                                                                                                            |
| updated_at       | 2024-10-13T06:05:01Z                                                                                                                                                                       |
| virtual_size     | None                                                                                                                                                                                       |
| visibility       | shared                                                                                                                                                                                     |
+------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
[root@controller ~]# openstack image show cirros
+------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Field            | Value                                                                                                                                                                                      |
+------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| checksum         | b874c39491a2377b8490f5f1e89761a4                                                                                                                                                           |
| container_format | bare                                                                                                                                                                                       |
| created_at       | 2024-10-13T06:04:57Z                                                                                                                                                                       |
| disk_format      | qcow2                                                                                                                                                                                      |
| file             | /v2/images/7ff6f9fa-44e3-4d76-9adf-c02fb3e2a5d4/file                                                                                                                                       |
| id               | 7ff6f9fa-44e3-4d76-9adf-c02fb3e2a5d4                                                                                                                                                       |
| min_disk         | 0                                                                                                                                                                                          |
| min_ram          | 0                                                                                                                                                                                          |
| name             | cirros                                                                                                                                                                                     |
| owner            | b47ea8448d9344b995deed86f68a8560                                                                                                                                                           |
| properties       | os_hash_algo='sha512', os_hash_value='6b813aa46bb90b4da216a4d19376593fa3f4fc7e617f03a92b7fe11e9a3981cbe8f0959dbebe36225e5f53dc4492341a4863cac4ed1ee0909f3fc78ef9c3e869', os_hidden='False' |
| protected        | False                                                                                                                                                                                      |
| schema           | /v2/schemas/image                                                                                                                                                                          |
| size             | 16300544                                                                                                                                                                                   |
| status           | active                                                                                                                                                                                     |
| tags             |                                                                                                                                                                                            |
| updated_at       | 2024-10-13T06:05:01Z                                                                                                                                                                       |
| virtual_size     | None                                                                                                                                                                                       |
| visibility       | shared                                                                                                                                                                                     |
+------------------+------------------------
  • 以上指令可以看出，glance 命令可以查看镜像详情只能使用 id 而不能使用 名称，openstack image 却可以
  • glance 与 openstack image 最大的区别在于， glance 的信息比较简略

修改镜像

修改镜像的命令为：glacne image-update

参数说明：

  • --min-disk：镜像启动最小硬盘大小。
  • --name：镜像名称。
  • --disk-format：镜像格式。
  • --min-ram：镜像启动最小内存大小。
  • --container-format：镜像在项目中可见性。

如：如果需要改变镜像启动硬盘最低要求值（min-disk）1G，min-disk默认单位为G。使用glance image-update更新镜像信息操作如下：

glance image-update --min-disk=1 96d10cf1-8ae5-4950-ac91-e1d30caac147
+------------------+----------------------------------------------------------------------------------+
| Property         | Value                                                                            |
+------------------+----------------------------------------------------------------------------------+
| checksum         | ee1eca47dc88f4879d8a229cc70a07c6                                                 |
| container_format | bare                                                                             |
| created_at       | 2024-10-13T06:11:54Z                                                             |
| disk_format      | qcow2                                                                            |
| id               | 96d10cf1-8ae5-4950-ac91-e1d30caac147                                             |
| min_disk         | 1                                                                                |
| min_ram          | 0                                                                                |
| name             | cirros_0.3.5                                                                     |
| os_hash_algo     | sha512                                                                           |
| os_hash_value    | 1b03ca1bc3fafe448b90583c12f367949f8b0e665685979d95b004e48574b953316799e23240f4f7 |
|                  | 39d1b5eb4c4ca24d38fdc6f4f9d8247a2bc64db25d6bbdb2                                 |
| os_hidden        | False                                                                            |
| owner            | b47ea8448d9344b995deed86f68a8560                                                 |
| protected        | False                                                                            |
| size             | 13287936                                                                         |
| status           | active                                                                           |
| tags             | []                                                                               |
| updated_at       | 2024-10-13T23:03:26Z                                                             |
| virtual_size     | Not available                                                                    |
| visibility       | shared                                                                           |
+------------------+----------------------------------------------------------------------------------+

如果需要改变镜像内存最低要求值（min-ram）1G，min-ram。使用glance image-update更新镜像信息操作如下：

glance image-update --min-ram=1 96d10cf1-8ae5-4950-ac91-e1d30caac147
+------------------+----------------------------------------------------------------------------------+
| Property         | Value                                                                            |
+------------------+----------------------------------------------------------------------------------+
| checksum         | ee1eca47dc88f4879d8a229cc70a07c6                                                 |
| container_format | bare                                                                             |
| created_at       | 2024-10-13T06:11:54Z                                                             |
| disk_format      | qcow2                                                                            |
| id               | 96d10cf1-8ae5-4950-ac91-e1d30caac147                                             |
| min_disk         | 1                                                                                |
| min_ram          | 1                                                                                |
| name             | cirros_0.3.5                                                                     |
| os_hash_algo     | sha512                                                                           |
| os_hash_value    | 1b03ca1bc3fafe448b90583c12f367949f8b0e665685979d95b004e48574b953316799e23240f4f7 |
|                  | 39d1b5eb4c4ca24d38fdc6f4f9d8247a2bc64db25d6bbdb2                                 |
| os_hidden        | False                                                                            |
| owner            | b47ea8448d9344b995deed86f68a8560                                                 |
| protected        | False                                                                            |
| size             | 13287936                                                                         |
| status           | active                                                                           |
| tags             | []                                                                               |
| updated_at       | 2024-10-13T23:03:45Z                                                             |
| virtual_size     | Not available                                                                    |
| visibility       | shared                                                                           |
+------------------+----------------------------------------------------------------------------------+

删除镜像

glance image-delete id

[root@controller ~]# glance image-list
+--------------------------------------+--------------+
| ID                                   | Name         |
+--------------------------------------+--------------+
| 7ff6f9fa-44e3-4d76-9adf-c02fb3e2a5d4 | cirros       |
| 96d10cf1-8ae5-4950-ac91-e1d30caac147 | cirros_0.3.5 |
+--------------------------------------+--------------+
[root@controller ~]# glance image-delete 7ff6f9fa-44e3-4d76-9adf-c02fb3e2a5d4