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# 存储后端(Storage Backends)
原始文件、解析出的图片、导出产物都要落在某个对象存储上。早期这只能靠环境变量配一套全局存储;migration `000068` 起改成**可注册多个存储实例**,空间选一个作默认,单个知识库还能绑定到指定实例。
典型用途:
- 不同团队/项目的资料落在不同的桶,便于分账与权限隔离;
- 合规要求某类文档必须存在特定地域的桶里;
- 从自建 MinIO 迁到云对象存储时,新库先用新后端,老库保持不动。
<Screenshot
src="/screenshots/settings-storage-backends.png"
caption="存储后端设置:多实例列表、默认实例与连通性测试"
hint="展示已注册的存储后端卡片(provider、状态、默认标记)与新建/编辑表单,含「测试连接」结果。" />
## 怎么配
入口在「设置 → 存储」(`storage` 分区,需 Admin):
1. 新建后端,选 provider(`local` / `minio` / `cos` / `oss` / `s3` / `tos` / `obs` 等,与[文档入库流程](../02-architecture/03-document-pipeline.md)里的存储 provider 一致),填连接参数;
2. **保存前点「测试」**:连通性测试会真实读写一次,配错的桶或过期的密钥能立刻发现,而不是等到上传文档时才报错;
3. 需要的话把它设为空间默认(`PUT /storage-backends/:id/default`,同时写回 `tenants.default_storage_backend_id`)。新建知识库不指定实例时就用这个默认值;
4. 单个知识库想用别的实例,在知识库编辑弹窗的「存储」页签里选——对应 `knowledge_bases.storage_backend_id`。
## 接口
| 方法 | 路径 | 权限 |
| --- | --- | --- |
| GET | `/storage-backends/types` | Viewer+,返回支持的 provider 及其字段定义 |
| GET | `/storage-backends`、`/storage-backends/:id` | Viewer+ |
| POST | `/storage-backends` | Admin+ |
| PUT / DELETE | `/storage-backends/:id` | Admin+ |
| POST | `/storage-backends/test` | Admin+,用未保存的参数试连 |
| POST | `/storage-backends/:id/test` | Admin+,测已保存的实例 |
| PUT | `/storage-backends/:id/default` | Admin+,设为空间默认 |
API Key 需要 `manage_storage_backends` 能力或 full-access。
## 数据模型与几个约束
`storage_backends` 表(`tenant_id` 隔离,软删除)关键字段:
| 字段 | 说明 |
| --- | --- |
| `name` | 空间内唯一(软删除下的部分唯一索引) |
| `provider` | 存储类型 |
| `config` | JSONB,含加密后的密钥 |
| `source` | `user`(界面注册)/ 其它(系统生成) |
| `status` | `active` / 停用 |
| `legacy_alias` | 见下 |
**`legacy_alias` 是为平滑升级准备的**:升级前用环境变量配置的那套全局存储,会被折算成一条别名记录,让老知识库的文件路径继续可解析,而不必做数据搬迁。同一空间同一 provider 只允许一条别名(部分唯一索引保证),因此它不会和你手工注册的实例混淆。
**库里一有文件就不能再换**:知识库的存储选择在**空库时可改**,一旦有了文件,界面上的选择框就被禁用并提示需要迁移(`KBStorageSettings.vue` 按 `hasFiles` 判断)。原因是已入库文件的路径是按当时的后端生成的,直接改绑定会让旧文件失联。确实要换的话,新建知识库再迁移内容。
## 与向量存储的区别
两者容易混:
| | 存储后端(Storage Backend) | 向量存储(Vector Store) |
| --- | --- | --- |
| 存什么 | 原始文件、图片、导出产物 | 向量与检索索引 |
| 配在哪 | 「设置 → 存储」 | 「设置 → 向量库」 |
| 知识库字段 | `storage_backend_id` | `vector_store_id` |
| 相关章节 | 本篇 | [检索引擎与向量存储](05-retrieval-engines.md) |