1. 前言

    在openstack中，glance负责p_w_picpath，即镜像相关的服务，镜像是一个已经打包好的文件，内置有操作系统和预先部署好的软件。基于p_w_picpath创建虚拟机，在openstack中是以backing file的形式创建的，即新建的虚拟机和镜像文件之间建立一个连接，相关的内容，后续以博客的形式呈现。本文以最简单的镜像上传为例，演示在openstack中制作完镜像之后，如何上传到openstack云环境中。

2. 通过glance操作

  1. 获取镜像，查看镜像信息

[root@controller upload]# qemu-img info CentOS-7-x86_64-GenericCloud.qcow2c p_w_picpath: CentOS-7-x86_64-GenericCloud.qcow2cfile format: qcow2                                #格式为qcow2virtual size: 8.0G (8589934592 bytes)             #空间大小disk size: 410Mcluster_size: 65536

2. 通过glance命令上传至openstack

[root@controller upload]# glance p_w_picpath-create --name centos-7 --disk-format qcow2 --container-format bare --min-disk 0 --min-ram 512 --is-public True --is-protected True --human-readable  --progress   --file CentOS-7-x86_64-GenericCloud.qcow2c [=================>            ] 59%+------------------+--------------------------------------+| Property         | Value                                |+------------------+--------------------------------------+| checksum         | 8e27a90b433e7c1a4db3fe8b8af6d1ad     || container_format | bare                                 || created_at       | 2016-01-21T01:58:13                  || deleted          | False                                || deleted_at       | None                                 || disk_format      | qcow2                                || id               | 4cccb602-0222-4c47-857a-5079ec571976 || is_public        | True                                 || min_disk         | 0                                    || min_ram          | 512                                  || name             | centos-7                             || owner            | 842ab3268a2c47e6a4b0d8774de805ae     || protected        | True                                 || size             | 409.2MB                              || status           | active                               || updated_at       | 2016-01-21T01:58:21                  || virtual_size     | None                                 |+------------------+--------------------------------------+

3. 查看glance镜像列表

[root@controller upload]# glance p_w_picpath-list+--------------------------------------+---------------+-------------+------------------+-------------+--------+| ID                                   | Name          | Disk Format | Container Format | Size        | Status |+--------------------------------------+---------------+-------------+------------------+-------------+--------+| 6637990f-bcff-4ea7-a978-d3edeeb636d7 | centos-5.9-kg | qcow2       | bare             | 2187460608  | active || 4cccb602-0222-4c47-857a-5079ec571976 | centos-7      | qcow2       | bare             | 429056512   | active |  #上传成功| b6c049c5-c4af-4f50-bba5-38b6850d7f41 | centos-7.0    | raw         | bare             | 10737418240 | active || 73379d54-10f8-42b9-94d3-16ca6640c4b0 | cfme          | qcow2       | bare             | 2052325376  | active || 37aaedc7-6fe6-4fc8-b110-408d166b8e51 | cirrors       | qcow2       | bare             | 13200896    | active || ff0f7d03-a553-4357-a819-c74e913d649f | win2k8        | qcow2       | bare             | 3391881216  | active |+--------------------------------------+---------------+-------------+------------------+-------------+--------+

4. 查看p_w_picpath的详细信息

[root@controller upload]# glance p_w_picpath-show 4cccb602-0222-4c47-857a-5079ec571976+------------------+--------------------------------------+| Property         | Value                                |+------------------+--------------------------------------+| checksum         | 8e27a90b433e7c1a4db3fe8b8af6d1ad     || container_format | bare                                 |      container个数| created_at       | 2016-01-21T01:58:13                  || deleted          | False                                || disk_format      | qcow2                                |      磁盘格式| id               | 4cccb602-0222-4c47-857a-5079ec571976 || is_public        | True                                 |      是否共有| min_disk         | 0                                    |      磁盘最小大小| min_ram          | 512                                  |      内存最小大小| name             | centos-7                             |      名字| owner            | 842ab3268a2c47e6a4b0d8774de805ae     || protected        | True                                 |      是否保护| size             | 429056512                            |      镜像大小| status           | active                               || updated_at       | 2016-01-21T01:58:21                  |+------------------+--------------------------------------+

5. p_w_picpath的更新

[root@controller upload]# glance p_w_picpath-update  --is-protected False 4cccb602-0222-4c47-857a-5079ec571976+------------------+--------------------------------------+| Property         | Value                                |+------------------+--------------------------------------+| checksum         | 8e27a90b433e7c1a4db3fe8b8af6d1ad     || container_format | bare                                 || created_at       | 2016-01-21T01:58:13                  || deleted          | False                                || deleted_at       | None                                 || disk_format      | qcow2                                || id               | 4cccb602-0222-4c47-857a-5079ec571976 || is_public        | True                                 || min_disk         | 0                                    || min_ram          | 512                                  || name             | centos-7                             || owner            | 842ab3268a2c47e6a4b0d8774de805ae     || protected        | False                                |        #设置不保护，有保护不可以删除| size             | 429056512                            || status           | active                               || updated_at       | 2016-01-21T02:02:20                  || virtual_size     | None                                 |+------------------+--------------------------------------+

6. p_w_picpath的删除

[root@controller upload]# glance p_w_picpath-delete 4cccb602-0222-4c47-857a-5079ec571976

3. 通过nova操作

    除了通过glance操作openstack的p_w_picpath服务之外，还可以通过nova命令操作，主要基于两方面的考虑:1. 最初glance集成在nova的代码中，到了E版才脱离出来，成为一个单独的项目，2. nova创建虚拟机的时候，需要通过API的方式调用glance，以获取instance的镜像，从而实现instance的创建。所以，也可以通过nova的方式操作glance，实际上都是调用glance的底层实现镜像的相关操作。与glance不同的是，nova提供了对镜像的快照功能。

  1. 查看p_w_picpath

[root@controller upload]# nova p_w_picpath-list+--------------------------------------+---------------+--------+--------+| ID                                   | Name          | Status | Server |+--------------------------------------+---------------+--------+--------+| 6637990f-bcff-4ea7-a978-d3edeeb636d7 | centos-5.9-kg | ACTIVE |        || b6c049c5-c4af-4f50-bba5-38b6850d7f41 | centos-7.0    | ACTIVE |        || 73379d54-10f8-42b9-94d3-16ca6640c4b0 | cfme          | ACTIVE |        || 37aaedc7-6fe6-4fc8-b110-408d166b8e51 | cirrors       | ACTIVE |        || ff0f7d03-a553-4357-a819-c74e913d649f | win2k8        | ACTIVE |        |+--------------------------------------+---------------+--------+--------+

2. 将instance转换为快照

root@controller upload]# nova p_w_picpath-create --show --poll  c3e573aa-ea68-42fc-97be-609cf0907298 nova_p_w_picpath_test_by_happyServer snapshotting... 100% completeFinished+-------------------------------------+--------------------------------------+| Property                            | Value                                |+-------------------------------------+--------------------------------------+| OS-EXT-IMG-SIZE:size                | 965541888                            |     #快照记录元数据metadata的信息| created                             | 2016-01-21T02:11:38Z                 || id                                  | 81c20616-fabd-419e-a286-37fd9b8cdb76 || metadata base_p_w_picpath_ref             | 5ce414b0-660a-46e1-ad0a-b842b2afc0b7 || metadata p_w_picpath_location             | snapshot                             || metadata p_w_picpath_state                | available                            || metadata p_w_picpath_type                 | snapshot                             || metadata instance_type_ephemeral_gb | 10                                   || metadata instance_type_flavorid     | 63a239ff-d557-4882-a9e4-1ebe24d98f3c || metadata instance_type_id           | 15                                   || metadata instance_type_memory_mb    | 2048                                 || metadata instance_type_name         | vmDev.F1                             || metadata instance_type_root_gb      | 10                                   || metadata instance_type_rxtx_factor  | 1.0                                  || metadata instance_type_swap         | 0                                    || metadata instance_type_vcpus        | 1                                    || metadata instance_uuid              | c3e573aa-ea68-42fc-97be-609cf0907298 || metadata network_allocated          | True                                 || metadata owner_id                   | 842ab3268a2c47e6a4b0d8774de805ae     || metadata user_id                    | bc5e46fc4204497185ae3ca6f8b7affb     || minDisk                             | 10                                   || minRam                              | 0                                    || name                                | nova_p_w_picpath_test_by_happy             || progress                            | 100                                  || server                              | c3e573aa-ea68-42fc-97be-609cf0907298 || status                              | ACTIVE                               || updated                             | 2016-01-21T02:14:20Z                 |+-------------------------------------+--------------------------------------+

3. 查看镜像快照的详细信息

[root@controller upload]# nova p_w_picpath-show 81c20616-fabd-419e-a286-37fd9b8cdb76+-------------------------------------+--------------------------------------+| Property                            | Value                                |+-------------------------------------+--------------------------------------+| OS-EXT-IMG-SIZE:size                | 965541888                            || created                             | 2016-01-21T02:11:38Z                 || id                                  | 81c20616-fabd-419e-a286-37fd9b8cdb76 || metadata base_p_w_picpath_ref             | 5ce414b0-660a-46e1-ad0a-b842b2afc0b7 || metadata p_w_picpath_location             | snapshot                             || metadata p_w_picpath_state                | available                            || metadata p_w_picpath_type                 | snapshot                             || metadata instance_type_ephemeral_gb | 10                                   || metadata instance_type_flavorid     | 63a239ff-d557-4882-a9e4-1ebe24d98f3c || metadata instance_type_id           | 15                                   || metadata instance_type_memory_mb    | 2048                                 || metadata instance_type_name         | vmDev.F1                             || metadata instance_type_root_gb      | 10                                   || metadata instance_type_rxtx_factor  | 1.0                                  || metadata instance_type_swap         | 0                                    || metadata instance_type_vcpus        | 1                                    || metadata instance_uuid              | c3e573aa-ea68-42fc-97be-609cf0907298 || metadata network_allocated          | True                                 || metadata owner_id                   | 842ab3268a2c47e6a4b0d8774de805ae     || metadata user_id                    | bc5e46fc4204497185ae3ca6f8b7affb     || minDisk                             | 10                                   || minRam                              | 0                                    || name                                | nova_p_w_picpath_test_by_happy             || progress                            | 100                                  || server                              | c3e573aa-ea68-42fc-97be-609cf0907298 || status                              | ACTIVE                               || updated                             | 2016-01-21T02:14:20Z                 |+-------------------------------------+--------------------------------------+

4. 删除p_w_picpath

[root@controller upload]# nova p_w_picpath-delete 81c20616-fabd-419e-a286-37fd9b8cdb76

4. 总结

    glance负责openstack中p_w_picpath的服务，p_w_picpath的制作可以通过两种方式：1. 新制作镜像，2. 从现有的instance做snapshot，前者的功能由glance实现，后者的功能由nova实现。制作完镜像之后，即可从镜像中启动虚拟机实例了。

5. 附录

  1. glance p_w_picpath-create的命令帮助信息

[root@controller upload]# glance help p_w_picpath-createusage: glance p_w_picpath-create [--id 
     
      ] [--name 
      
       ] [--store 
       
        ]                           [--disk-format 
        
         ]                           [--container-format 
         
          ]                           [--owner 
          
           ] [--size 
           
            ]                           [--min-disk 
            
             ] [--min-ram 
             
              ]                           [--location 
              
               ] [--file 
               
                ]                           [--checksum 
                
                 ] [--copy-from 
                 
                  ]                           [--is-public {True,False}]                           [--is-protected {True,False}]                           [--property 
                  
                   ] [--human-readable]                           [--progress]Create a new p_w_picpath.Optional arguments:  --id 
                   
                           ID of p_w_picpath to reserve.  --name 
                    
                              Name of p_w_picpath.                                            #名字  --store 
                     
                             Store to upload p_w_picpath to.  --disk-format 
                      
                                               Disk format of p_w_picpath. Acceptable formats: ami, ari,       #磁盘格式，支持aki, vhd, vmdk, raw, qcow2, vdi, and iso格式                              aki, vhd, vmdk, raw, qcow2, vdi, and iso  --container-format 
                       
                                                                   #容器格式,支持ami,ari, aki, bare, and ovf格式                        Container format of p_w_picpath. Acceptable formats: ami,                        ari, aki, bare, and ovf.  --owner 
                        
                            Tenant who should own p_w_picpath.  --size 
                         
                                   Size of p_w_picpath data (in bytes). Only used with '--                        location' and '--copy_from'.  --min-disk 
                          
                             Minimum size of disk needed to boot p_w_picpath (in            #最小的磁盘，表示镜像最小需要的磁盘空间，和flavor有关，如果太小，则创建vm失败                        gigabytes).  --min-ram 
                           
                              Minimum amount of ram needed to boot p_w_picpath (in                        megabytes).  --location 
                            
                                                     URL where the data for this p_w_picpath already resides. For   #位置，支持三种location,file和copy-from，location是一个url路径                        example, if the p_w_picpath data is stored in swift, you                        could specify                        'swift://account:key@example.com/container/obj'.         #本地文件  --file 
                             
                                       Local file that contains disk p_w_picpath to be uploaded                        during creation. Alternatively, p_w_picpaths can be passed                        to the client via stdin.  --checksum 
                              
                                                       Hash of p_w_picpath data used Glance can use for                        verification. Provide a md5 checksum here.  --copy-from 
                               
                                                                                        #远程拷贝，相比于location，copy-from会直接拷贝，而location则指定定义url路径                        Similar to '--location' in usage, but this indicates                        that the Glance server should immediately copy the                        data and store it in its configured p_w_picpath store.  --is-public {True,False}                                                       #设置是否共有                        Make p_w_picpath accessible to the public.  --is-protected {True,False}                                                    #是否保护标志位，房子误删除                        Prevent p_w_picpath from being deleted.  --property 
                                
                                                         Arbitrary property to associate with p_w_picpath. May be                        used multiple times.  --human-readable      Print p_w_picpath size in a human-friendly format.             #镜像大小可读，即MB，GB格式显示  --progress            Show upload progress bar.                                #显示上传的进度条

2. glance相关命令

[root@controller upload]# glance help usage: glance [--version] [-d] [-v] [--get-schema] [-k]              [--cert-file CERT_FILE] [--key-file KEY_FILE]              [--os-cacert 
     
      ] [--ca-file OS_CACERT]              [--timeout TIMEOUT] [--no-ssl-compression] [-f] [--dry-run]              [--ssl] [-H ADDRESS] [-p PORT] [--os-username OS_USERNAME]              [-I OS_USERNAME] [--os-password OS_PASSWORD] [-K OS_PASSWORD]              [--os-tenant-id OS_TENANT_ID] [--os-tenant-name OS_TENANT_NAME]              [-T OS_TENANT_NAME] [--os-auth-url OS_AUTH_URL] [-N OS_AUTH_URL]              [--os-region-name OS_REGION_NAME] [-R OS_REGION_NAME]              [--os-auth-token OS_AUTH_TOKEN] [-A OS_AUTH_TOKEN]              [--os-p_w_picpath-url OS_IMAGE_URL] [-U OS_IMAGE_URL]              [--os-p_w_picpath-api-version OS_IMAGE_API_VERSION]              [--os-service-type OS_SERVICE_TYPE]              [--os-endpoint-type OS_ENDPOINT_TYPE] [-S OS_AUTH_STRATEGY]              
      
        ...Command-line interface to the OpenStack Images API.Positional arguments:  
       
            add                 DEPRECATED! Use p_w_picpath-create instead.        #旧版的增删改查，即add,delete,update,list,show,details    clear               DEPRECATED!    delete              DEPRECATED! Use p_w_picpath-delete instead.    details             DEPRECATED! Use p_w_picpath-list instead.    p_w_picpath-create        Create a new p_w_picpath.                          #新版的增删改查，即p_w_picpath-create,p_w_picpath-delete,p_w_picpath-update,p_w_picpath-list,p_w_picpath-show    p_w_picpath-delete        Delete specified p_w_picpath(s).    p_w_picpath-download      Download a specific p_w_picpath.    p_w_picpath-list          List p_w_picpaths you can access.    p_w_picpath-members       DEPRECATED! Use member-list instead.    p_w_picpath-show          Describe a specific p_w_picpath.    p_w_picpath-update        Update a specific p_w_picpath.    index               DEPRECATED! Use p_w_picpath-list instead.    member-add          DEPRECATED! Use member-create instead.      #如果p_w_picpath设置为private，则可以通过member的形式共享给其他的tenant使用    member-create       Share a specific p_w_picpath with a tenant.       #包含member共享的相关操作，即member-create新建共享，member-delete删除共享，member-list查看共享    member-delete       Remove a shared p_w_picpath from a tenant.    member-p_w_picpaths       DEPRECATED! Use member-list instead.    member-list         Describe sharing permissions by p_w_picpath or tenant.    members-replace     DEPRECATED!    show                DEPRECATED! Use p_w_picpath-show instead.    update              DEPRECATED! Use p_w_picpath-update instead.    help                Display help about this program or one of its                        subcommands.