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Glance是OpenStack镜像服务，用来注册、登陆和检索虚拟机镜像。Glance服务提供了一个REST API，使读者能够查询虚拟机镜像元数据和检索的实际镜像。通过镜像服务提供的虚拟机镜像可以存储在不同的位置，从简单的文件系统对象存储到类似OpenStack对象存储系统。
CirrOS是一个极小的云操作系统，可以使用这个小的操作系统来进行Glance服务组件的操作练习。将提供的cirros-0.3.4-x86_64-disk.img镜像上传到controller节点的root目录下面
[root@controller ~]# ls cirros-0.3.4-x86_64-disk.img 将镜像上传至controller节点后，通过file命令查看镜像文件信息
[root@controller ~]# file cirros-0.3.4-x86_64-disk.img cirros-0.3.4-x86_64-disk.img: QEMU QCOW Image (v2), 41126400 bytes 通过命令创建镜像，命令的格式如下：
[root@controller images]# glance help image-create usage: glance image-create [--architecture <ARCHITECTURE>] [--protected [True|False]] [--name <NAME>] [--instance-uuid <INSTANCE_UUID>] [--min-disk <MIN_DISK>] [--visibility <VISIBILITY>] [--kernel-id <KERNEL_ID>] [--tags <TAGS> [<TAGS> ...]] [--os-version <OS_VERSION>] [--disk-format <DISK_FORMAT>] [--os-distro <OS_DISTRO>] [--id <ID>] [--owner <OWNER>] [--ramdisk-id <RAMDISK_ID>] [--min-ram <MIN_RAM>] [--container-format <CONTAINER_FORMAT>] [--property <key=value>] [--file <FILE>] [--progress] #参数说明 --disk-format：镜像格式 --container-format： 镜像在其他项目中可见性 --progress： 显示上传镜像的进度 --file：选择本地镜像文件 --name：上传后镜像的名称 使用镜像cirros-0.3.4-x86_64-disk.img通过命令上传镜像至OpenStack中
[root@controller ~]# glance image-create --name cirros-0.3.4 --disk-format qcow2 --container-format bare --progress < cirros-0.3.4-x86_64-disk.img [=============================>] 100% +------------------+--------------------------------------------------------------------+ | Property | Value | +------------------+--------------------------------------------------------------------+ | checksum | f8ab98ff5e73ebab884d80c9dc9c7290 | | container_format | bare | | created_at | 2022-02-10T03:15:29Z | | disk_format | qcow2 | | id | 32a2513c-e5ba-438b-a5ee-63c35c03b284 | | min_disk | 0 | | min_ram | 0 | | name | cirros-0.3.4 | | os_hash_algo | sha512 | | os_hash_value | f0fd1b50420dce4ca382ccfbb528eef3a38bbeff00b54e95e3876b9bafe7ed2d6f9 19ca35d9046d437c6d2d8698b1174a335fbd66035bb3edc525d2cdb187232 | | os_hidden | False | | owner | 1776912d52a7444d8b2d09eb86e8d1d9 | | protected | False | | size | 13267968 | | status | active | | tags | [] | | updated_at | 2022-02-10T03:15:29Z | | virtual_size | Not available | | visibility | shared | +------------------+--------------------------------------------------------------------+ 通过命令可以在OpenStack平台中查看当前glance中所上传的镜像名称
[root@controller ~]# glance image-list +--------------------------------------+--------------+ | ID | Name | +--------------------------------------+--------------+ | 32a2513c-e5ba-438b-a5ee-63c35c03b284 | cirros-0.3.4 | +--------------------------------------+--------------+ 也可以使用命令查看镜像的详细信息
[root@controller ~]# glance image-show 32a2513c-e5ba-438b-a5ee-63c35c03b284 +------------------+--------------------------------------------------------------------+ | Property | Value | +------------------+------------------------------------------------------------------ -+ | checksum | f8ab98ff5e73ebab884d80c9dc9c7290 | | container_format | bare | | created_at | 2022-02-10T03:15:29Z | | disk_format | qcow2 | | id | 32a2513c-e5ba-438b-a5ee-63c35c03b284 | | min_disk | 0 | | min_ram | 0 | | name | cirros-0.3.4 | | os_hash_algo | sha512 | | os_hash_value | f0fd1b50420dce4ca382ccfbb528eef3a38bbeff00b54e95e3876b9bafe7ed2d6f9 19ca35d9046d437c6d2d8698b1174a335fbd66035bb3edc525d2cdb187232 | | os_hidden | False | | owner | 1776912d52a7444d8b2d09eb86e8d1d9 | | protected | False | | size | 13267968 | | status | active | | tags | [] | | updated_at | 2022-02-10T03:15:29Z | | virtual_size | Not available | | visibility | shared | +------------------+--------------------------------------------------------------------+ 可以使用glance image-update更新镜像信息，命令的格式如下
[root@controller images]# glance help image-update usage: glance image-update [--architecture <ARCHITECTURE>] [--protected [True|False]] [--name <NAME>] [--instance-uuid <INSTANCE_UUID>] [--min-disk <MIN_DISK>] [--visibility <VISIBILITY>] [--kernel-id <KERNEL_ID>] [--os-version <OS_VERSION>] [--disk-format <DISK_FORMAT>] [--os-distro <OS_DISTRO>] [--owner <OWNER>] [--ramdisk-id <RAMDISK_ID>] [--min-ram <MIN_RAM>] [--container-format <CONTAINER_FORMAT>] [--property <key=value>] [--remove-property key] <IMAGE_ID> #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
[root@controller ~]# glance image-update --min-disk=1 32a2513c-e5ba-438b-a5ee-63c35c03b284 +------------------+--------------------------------------------------------------------+ | Property | Value | +------------------+--------------------------------------------------------------------+ | checksum | f8ab98ff5e73ebab884d80c9dc9c7290 | | container_format | bare | | created_at | 2022-02-10T03:15:29Z | | disk_format | qcow2 | | id | 32a2513c-e5ba-438b-a5ee-63c35c03b284 | | min_disk | 1 | | min_ram | 0 | | name | cirros-0.3.4 | | os_hash_algo | sha512 | | os_hash_value | f0fd1b50420dce4ca382ccfbb528eef3a38bbeff00b54e95e3876b9bafe7ed2d6f9 19ca35d9046d437c6d2d8698b1174a335fbd66035bb3edc525d2cdb187232 | | os_hidden | False | | owner | 1776912d52a7444d8b2d09eb86e8d1d9 | | protected | False | | size | 13267968 | | status | active | | tags | [] | | updated_at | 2022-02-10T03:16:59Z | | virtual_size | Not available | | visibility | shared | +------------------+--------------------------------------------------------------------+ 也可以使用命令更新镜像启动内存最低要求值（min-ram）为1G，min-ram默认单位为M。使用glance image-update更新镜像信息操作如下：
[root@controller ~]# glance image-update --min-ram=1024 32a2513c-e5ba-438b-a5ee-63c35c03b284 +------------------+--------------------------------------------------------------------+ | Property | Value | +------------------+--------------------------------------------------------------------+ | checksum | f8ab98ff5e73ebab884d80c9dc9c7290 | | container_format | bare | | created_at | 2022-02-10T03:15:29Z | | disk_format | qcow2 | | id | 32a2513c-e5ba-438b-a5ee-63c35c03b284 | | min_disk | 1 | | min_ram | 1024 | | name | cirros-0.3.4 | | os_hash_algo | sha512 | | os_hash_value | f0fd1b50420dce4ca382ccfbb528eef3a38bbeff00b54e95e3876b9bafe7ed2d6f9 19ca35d9046d437c6d2d8698b1174a335fbd66035bb3edc525d2cdb187232 | | os_hidden | False | | owner | 1776912d52a7444d8b2d09eb86e8d1d9 | | protected | False | | size | 13267968 | | status | active | | tags | [] | | updated_at | 2022-02-10T03:17:21Z | | virtual_size | Not available | | visibility | shared | +------------------+--------------------------------------------------------------------+ 可以使用glance image-delete删除上传至OpenStack平台中的镜像，只需要在命令后跟上镜像ID即可
[root@controller images]# glance image-delete 32a2513c-e5ba-438b-a5ee-63c35c03b284 [root@controller images]# glance image-list +--------------------------------------+------------------------------+ | ID | Name | +--------------------------------------+------------------------------+ +--------------------------------------+------------------------------+ 
