一，Glance 介绍
1.什么是Glance
glance即image service（镜像服务），是为虚拟机的创建提供镜像服务
2. Glance服务组成
1 Image Service的功能是管理Image，让用户能够发现、获取和保存Image。
2 在Openstack中，提供Image Servce的是Glance，其具体功能如下：
提供REST API让用户能够查询和获取image的元数据和image本身。
支持多种方式存储image，包括普通的文件系统，Swift、Amazon S3等。
对Instance执行Snapshot创建新的image。
镜像格式
3. 虚拟机镜像文件磁盘格式
镜像文件容器格式
4.镜像状态
镜像从上传到可识别的几个状态
镜像在上载完成后的状态
5.访问权限
Public(公共的):可以被所有的项目使用
Private (私有的):只有被镜像所有者所在的项目使用
Shared (共享的):一 个非共有的镜像可以共享给其他项目，这是通过项目成员(member-*) 操作来实现
Protected (受保护的):这种镜像不能被删除
6，架构
二，部署
1、创建数据库实例和数据库用户
[root@ct ~]# mysql -u root -p
MariaDB [(none)]> CREATE DATABASE glance;
MariaDB [(none)]> GRANT ALL PRIVILEGES ON glance.* TO 'glance'@'localhost' IDENTIFIED BY 'GLANCE_DBPASS';
MariaDB [(none)]> GRANT ALL PRIVILEGES ON glance.* TO 'glance'@'%' IDENTIFIED BY 'GLANCE_DBPASS';
MariaDB [(none)]> flush privileges;
MariaDB [(none)]> exit
2、创建用户、修改配置文件
2.1、创建OpenStack的Glance用户
创建用户前，需要首先执行管理员环境变量脚本（此处已经在~/.bashrc 中定义过了）
[root@ct ~]# openstack user create --domain default --password GLANCE_PASS glance #创建glance用户
+---------------------+----------------------------------+
| Field | Value |
+---------------------+----------------------------------+
| domain_id | default |
| enabled | True |
| id | 401ece6ae6a84306a6c7773449cbd2c6 |
| name | glance |
| options | {} |
| password_expires_at | None |
+---------------------+----------------------------------+
[root@ct ~]# openstack role add --project service --user glance admin #将glance用户添加到service项目中，并且针对项目拥有admin权限
[root@ct ~]# openstack service create --name glance --description "OpenStack Image" image #创建一个service服务，service名称为glance，类似image
+-------------+----------------------------------+
| Field | Value |
+-------------+----------------------------------+
| description | OpenStack Image |
| enabled | True |
| id | 7504ed8e58994340b85307ba66addf51 |
| name | glance |
| type | image |
+-------------+----------------------------------+
[root@ct ~]# openstack service list # 查看项目
+----------------------------------+----------+----------+
| ID | Name | Type |
+----------------------------------+----------+----------+
| 7504ed8e58994340b85307ba66addf51 | glance | image |
| ef633d69afdb401b9f39fb36af90db06 | keystone | identity |
+----------------------------------+----------+----------+
2.2，创建镜像服务 API 端点
OpenStack使用三种API端点代表三种服务：admin、internal、public
[root@ct ~]# openstack endpoint create --region RegionOne image public http://ct:9292
+--------------+----------------------------------+
| Field | Value |
+--------------+----------------------------------+
| enabled | True |
| id | 62c305879da1447391bb94a2ec816a26 |
| interface | public |
| region | RegionOne |
| region_id | RegionOne |
| service_id | 7504ed8e58994340b85307ba66addf51 |
| service_name | glance |
| service_type | image |
| url | http://ct:9292 |
+--------------+----------------------------------+
[root@ct ~]# openstack endpoint create --region RegionOne image internal http://ct:9292
+--------------+----------------------------------+
| Field | Value |
+--------------+----------------------------------+
| enabled | True |
| id | 87715cc052c14c258ebbf25cb23da445 |
| interface | internal |
| region | RegionOne |
| region_id | RegionOne |
| service_id | 7504ed8e58994340b85307ba66addf51 |
| service_name | glance |
| service_type | image |
| url | http://ct:9292 |
+--------------+----------------------------------+
[root@ct ~]# openstack endpoint create --region RegionOne image admin http://ct:9292
+--------------+----------------------------------+
| Field | Value |
+--------------+----------------------------------+
| enabled | True |
| id | 3a72c904739843a985b2461cdf9f92ea |
| interface | admin |
| region | RegionOne |
| region_id | RegionOne |
| service_id | 7504ed8e58994340b85307ba66addf51 |
| service_name | glance |
| service_type | image |
| url | http://ct:9292 |
+--------------+----------------------------------+
3、安装 openstack-glance 软件包
3.1.安装并修改glance配置文件，两个配置文件：
/etc/glance/glance-api.conf
/etc/glance/glance-registry.conf
安装 openstack-glance 软件包。
[root@ct ~]# yum -y install openstack-glance
3.2，修改glance配置文件，glance有两个配置文件：
/etc/glance/glance-api.conf
/etc/glance/glance-registry.conf
[root@ct ~]# cp -a /etc/glance/glance-api.conf{,.bak}
[root@ct ~]# grep -Ev '^$|#' /etc/glance/glance-api.conf.bak > /etc/glance/glance-api.conf
3.3，添加glance-api.conf配置
[root@ct ~]# openstack-config --set /etc/glance/glance-registry.conf database connection mysql+pymysql://glance:GLANCE_DBPASS@t/glance
[root@ct ~]# openstack-config --set /etc/glance/glance-registry.conf keystone_authtoken www_authenticate_uri http://ct:5000
[root@ct ~]# openstack-config --set /etc/glance/glance-registry.conf keystone_authtoken auth_url http://ct:5000
[root@ct ~]# openstack-config --set /etc/glance/glance-registry.conf keystone_authtoken memcached_servers ct:11211
[root@ct ~]# openstack-config --set /etc/glance/glance-registry.conf keystone_authtoken auth_type password
[root@ct ~]# openstack-config --set /etc/glance/glance-registry.conf keystone_authtoken project_domain_name Default
[root@ct ~]# openstack-config --set /etc/glance/glance-registry.conf keystone_authtoken user_domain_name Default
[root@ct ~]# openstack-config --set /etc/glance/glance-registry.conf keystone_authtoken project_name service
[root@ct ~]# openstack-config --set /etc/glance/glance-registry.conf keystone_authtoken username glance
[root@ct ~]# openstack-config --set /etc/glance/glance-registry.conf keystone_authtoken password GLANCE_PASS
[root@ct ~]# openstack-config --set /etc/glance/glance-registry.conf paste_deploy flavor keystone
[root@ct glance]# cat glance-api.conf
[DEFAULT]
[cinder]
[cors]
[database]
connection = mysql+pymysql://glance:GLANCE_DBPASS@ct/glance
[file]
[glance.store.http.store]
[glance.store.rbd.store]
[glance.store.sheepdog.store]
[glance.store.swift.store]
[glance.store.vmware_datastore.store]
[glance_store]
stores = file,http ##后端存储的默认类型，file：文件；http：基于api调用的方式，把镜像放到其他存储上
default_store = file ##默认存储方式，即本地
filesystem_store_datadir = /var/lib/glance/images/ ##指定镜像存放的本地目录
[image_format]
[keystone_authtoken]
www_authenticate_uri = http://ct:5000 ##指定认证的keystone的URI
auth_url = http://ct:5000
memcached_servers = ct:11211
auth_type = password
project_domain_name = Default
user_domain_name = Default
project_name = service #glance用户针对service项目拥有admin权限
username = glance
password = GLANCE_PASS
[oslo_concurrency]
[oslo_messaging_amqp]
[oslo_messaging_kafka]
[oslo_messaging_notifications]
[oslo_messaging_rabbit]
[oslo_middleware]
[oslo_policy]
[paste_deploy]
flavor = keystone #指定提供认证的服务器为keystone
[profiler]
[store_type_location_strategy]
[task]
[taskflow_executor]
4.初始化数据库
su -s /bin/sh -c "glance-manage db_sync" glance
5.开启glance服务
[root@ct ~]# systemctl enable openstack-glance-api.service
Created symlink from /etc/systemd/system/multi-user.target.wants/openstack-glance-api.service to /usr/lib/systemd/system/openstack-glance-api.service.
[root@ct ~]# systemctl start openstack-glance-api.service
[root@ct ~]# netstat -anpt | grep 9292
tcp 0 0 0.0.0.0:9292 0.0.0.0:* LISTEN 51179/python2
[root@ct ~]#
6.赋予glance服务权限
[root@ct ~]# chown -hR glance:glance /var/lib/glance/
[root@ct ~]# ll /var/lib/glance/
总用量 0
drwxr-x---. 2 glance glance 6 8月 26 16:16 images
[root@ct ~]#
7.镜像导入
[root@ct ~]# openstack image create --file cirros-0.3.5-x86_64-disk.img --disk-format qcow2 --container-format bare --public cirros
+------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Field | Value |
+------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| checksum | f8ab98ff5e73ebab884d80c9dc9c7290 |
| container_format | bare |
| created_at | 2021-08-26T08:23:14Z |
| disk_format | qcow2 |
| file | /v2/images/bbdc00d8-e2ea-4d44-8aae-47aa80c6322f/file |
| id | bbdc00d8-e2ea-4d44-8aae-47aa80c6322f |
| min_disk | 0 |
| min_ram | 0 |
| name | cirros |
| owner | 06bda3fc6abd44b186f168002107c832 |
| properties | os_hash_algo='sha512', os_hash_value='f0fd1b50420dce4ca382ccfbb528eef3a38bbeff00b54e95e3876b9bafe7ed2d6f919ca35d9046d437c6d2d8698b1174a335fbd66035bb3edc525d2cdb187232', os_hidden='False' |
| protected | False |
| schema | /v2/schemas/image |
| size | 13267968 |
| status | active |
| tags | |
| updated_at | 2021-08-26T08:23:14Z |
| virtual_size | None |
| visibility | public |
+------------------+-------------------------------------------
验证，查看镜像的两种方式
[root@ct ~]# openstack image list
[root@ct ~]# glance image-list
