# ngx\_http\_keyval\_module

* [指令](/nginx-docs/he-xin-gong-neng/http/ngx_http_keyval_module.md#directives)
  * [keyval](/nginx-docs/he-xin-gong-neng/http/ngx_http_keyval_module.md#keyval)
  * [keyval\_zone](/nginx-docs/he-xin-gong-neng/http/ngx_http_keyval_module.md#keyval_zone)

`ngx_http_keyval_module` 模块（1.13.3）创建的带值变量从 [API](https://github.com/DocsHome/nginx-docs/tree/f6135c42a499e9fab0adb433738fcf8cd4041627/模块参考/http/ngx_http_api_module.md#http_keyvals_) 管理的键值对中获取。

> 该模块可作为我们[商业订阅](http://nginx.com/products/?_ga=2.259594698.1917722686.1520954456-1859001452.1520648382)的一部分。

## 示例配置 <a href="#example_configuration" id="example_configuration"></a>

```
http {

    keyval_zone zone=one:32k state=one.keyval;
    keyval $arg_text $text zone=one;
    ...
    server {
        ...
        location / {
            return 200 $text;
        }

        location /api {
            api write=on;
        }
    }
}
```

## 指令 <a href="#directives" id="directives"></a>

### keyval

|       - | 说明                                    |
| ------: | ------------------------------------- |
|  **语法** | **keyval** `key $variable zone=name`; |
|  **默认** | ——                                    |
| **上下文** | http                                  |

创建一个新的变量 `$variable`，该变量的值从键值数据库中通过 `key` 查找。字符串匹配忽略大小写。数据库存储在 `zone` 参数指定的共享内存区域中。

### keyval\_zone

|       - | 说明                                              |
| ------: | ----------------------------------------------- |
|  **语法** | **keyval\_zone** `zone=name:size [state=file]`; |
|  **默认** | ——                                              |
| **上下文** | http                                            |

设置保存键值数据库的共享内存区域的名称（`name`）和大小（`size`）。键值对由 [API](https://github.com/DocsHome/nginx-docs/tree/f6135c42a499e9fab0adb433738fcf8cd4041627/模块参考/http/ngx_http_api_module.md#http_keyvals_) 管理。

可选的 `state` 参数指定一个文件，该文件将键值数据库的当前状态保持为 JSON 格式，并使其在 nginx 重启时保持不变。

## 原文档

<http://nginx.org/en/docs/http/ngx_http_keyval_module.html>


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