08.存储Cinder→4.Cinder组件详解→1.cinder-api

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1. cinder-api 向外界暴露若干 HTTP REST API 接口，在 keystone 中我们可以查询 cinder-api 的 endponits。
   

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   root@controller:~# openstack endpoint list +----------------------------------+-----------+--------------+----------------+---------+-----------+------------------------------------------------+ | ID | Region | Service Name | Service Type | Enabled | Interface | URL | +----------------------------------+-----------+--------------+----------------+---------+-----------+------------------------------------------------+ | 06b3d542f3ee43cd96e02bc607b2eb4e | RegionOne | cinderv3 | volumev3 | True | public | http://192.168.32.73/volume/v3/$(project_id)s | | 15bad1304d7b46e989329c3fb4ba76d4 | RegionOne | keystone | identity | True | admin | http://192.168.32.73/identity | | 1a339b1a524341218d3e43254f93fd48 | RegionOne | cinderv2 | volumev2 | True | public | http://192.168.32.73/volume/v2/$(project_id)s | | 2d3e96fbe41c4b7a842d8f3138edba07 | RegionOne | cinder | block-storage | True | public | http://192.168.32.73/volume/v3/$(project_id)s | | 4ddb72eb412948d09100b9db2d007e21 | RegionOne | glance | image | True | public | http://192.168.32.73/image | | 75a7442ebbdb47239d5ae577b99abfe6 | RegionOne | cinder | volume | True | public | http://192.168.32.73/volume/v1/$(project_id)s | | 78c763847bed477da135f0a2fcd6aa51 | RegionOne | nova_legacy | compute_legacy | True | public | http://192.168.32.73/compute/v2/$(project_id)s | | ce509688367d4a309ed9869823cfdfb7 | RegionOne | neutron | network | True | public | http://192.168.32.73:9696/ | | d78c9ca6605c48eea7921e1dcf58412b | RegionOne | nova | compute | True | public | http://192.168.32.73/compute/v2.1 | | f4583d37662640ad8a39a1107439b268 | RegionOne | keystone | identity | True | public | http://192.168.32.73/identity | | f51f3152ef434d72bfefc1fd3309ba54 | RegionOne | placement | placement | True | public | http://192.168.32.73/placement | +----------------------------------+-----------+--------------+----------------+---------+-----------+------------------------------------------------+ root@controller:~# openstack endpoint show 75a7442ebbdb47239d5ae577b99abfe6 +--------------+-----------------------------------------------+ | Field | Value | +--------------+-----------------------------------------------+ | enabled | True | | id | 75a7442ebbdb47239d5ae577b99abfe6 | | interface | public | | region | RegionOne | | region_id | RegionOne | | service_id | ef61d58a3d6b424fb96c031e4a3d2410 | | service_name | cinder | | service_type | volume | | url | http://192.168.32.73/volume/v1/$(project_id)s | +--------------+-----------------------------------------------+

2. 当然，作为最终用户的我们不会直接发送 Rest API 请求。OpenStack CLI，Dashboard 和其他需要跟 Cinder 交换的组件会使用这些 API。
3. cinder-api 对接收到的 HTTP API 请求会做如下处理：
1. 检查客户端传入的参数是否合法有效
2. 调用 cinder 其他子服务的处理客户端请求
3. 将 cinder 其他子服务返回的结果格式化并返回给客户端
4. cinder-api 接受哪些请求呢？简单的说，只要是 Volume 生命周期相关的操作，cinder-api 都可以响应。大部分操作都可以在 Dashboard 上看到。