交互模式¶
OpenStackClient 具有交互模式，类似于 Linux 上的 virsh(1) 或 lvm(8) 命令。 此模式对于执行一系列命令而无需重新加载 CLI，或者更重要的是，无需重新认证到云端非常有用。
通过发出不带子命令的 openstack 命令进入交互模式。 将显示 (openstack) 提示符。 使用 exit 终止交互模式。
身份验证¶
认证过程与之前完全相同，使用相同的全局命令行选项和环境变量，只是它只发生一次。 凭据会被缓存并重复用于后续命令。 这意味着要使用多个云，必须结束交互模式，以便可以进行第二次云的认证。
脚本编写¶
在脚本中使用交互模式似乎违反直觉，但通过 stdin 将 OSC 命令传递给 CLI，可以获得相同的单次认证优势。
示例会话
# assume auth credentials are in the environment
$ openstack
(openstack) keypair list
+--------+-------------------------------------------------+
| Name | Fingerprint |
+--------+-------------------------------------------------+
| bunsen | a5:da:0c:52:e8:52:42:a3:4f:b8:22:62:7b:e4:e8:89 |
| beaker | 45:9c:50:56:7c:fc:3a:b6:b5:60:02:2f:41:fb:a9:4c |
+--------+-------------------------------------------------+
(openstack) image list
+--------------------------------------+----------------+
| ID | Name |
+--------------------------------------+----------------+
| 78b23835-c800-4d95-9d2a-e4de59a553d8 | OpenWRT r42884 |
| 2e45d43a-7c25-45f1-b012-06ac313e2f6b | Fedora 20 |
| de3a8396-3bae-42de-84bd-f4e398b8c320 | CirrOS |
+--------------------------------------+----------------+
(openstack) flavor list
+--------------------------------------+----------+--------+--------+-----------+------+-------+-------------+-----------+-------------+
| ID | Name | RAM | Disk | Ephemeral | Swap | VCPUs | RXTX Factor | Is Public | Extra Specs |
+--------------------------------------+----------+--------+--------+-----------+------+-------+-------------+-----------+-------------+
| 12594680-56f7-4da2-8322-7266681b3070 | m1.small | 2048 | 20 | 0 | | 1 | | True | |
| 9274f903-0cc7-4a95-9124-1968018e355d | m1.tiny | 512 | 5 | 0 | | 1 | | True | |
+--------------------------------------+----------+--------+--------+-----------+------+-------+-------------+-----------+-------------+
(openstack) server create --image CirrOS --flavor m1.small --key-name beaker sample-server
+-----------------------------+-------------------------------------------------+
| Field | Value |
+-----------------------------+-------------------------------------------------+
| config_drive | |
| created | 2014-11-19T18:08:41Z |
| flavor | m1.small (12594680-56f7-4da2-8322-7266681b3070) |
| id | 3a9a7f82-e902-4948-9245-52b045c76a1d |
| image | CirrOS (de3a8396-3bae-42de-84bd-f4e398b8c320) |
| key_name | bunsen |
| name | sample-server |
| progress | 0 |
| properties | |
| security_groups | [{u'name': u'default'}] |
| status | BUILD |
| tenant_id | 53c93c7952594d9ba16bd7072a165ce8 |
| updated | 2014-11-19T18:08:42Z |
| user_id | 1e4eea54c7124688a8092bec6e2dbee6 |
+-----------------------------+-------------------------------------------------+
可以一次性发出类似的会话
$ openstack <<EOF
> keypair list
> flavor show m1.small
> EOF
(openstack) +--------+-------------------------------------------------+
| Name | Fingerprint |
+--------+-------------------------------------------------+
| bunsen | a5:da:0c:52:e8:52:42:a3:4f:b8:22:62:7b:e4:e8:89 |
| beaker | 45:9c:50:56:7c:fc:3a:b6:b5:60:02:2f:41:fb:a9:4c |
+--------+-------------------------------------------------+
(openstack) +----------------------------+--------------------------------------+
| Field | Value |
+----------------------------+--------------------------------------+
| OS-FLV-DISABLED:disabled | False |
| OS-FLV-EXT-DATA:ephemeral | 0 |
| disk | 20 |
| id | 12594680-56f7-4da2-8322-7266681b3070 |
| name | m1.small |
| os-flavor-access:is_public | True |
| ram | 2048 |
| swap | |
| vcpus | 1 |
+----------------------------+--------------------------------------+
限制¶
交互模式的显而易见的局限性在于它不是特定领域语言 (DSL)，而只是一个简单的命令处理器。 这意味着没有变量或流程控制。
