> For the complete documentation index, see [llms.txt](https://docs.fluentd.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.fluentd.org/input/unix.md).

# unix

The `in_unix` Input plugin enables Fluentd to retrieve records from the Unix Domain Socket. The wire protocol is the same as [`in_forward`](/input/forward.md), but the transport layer is different.

It is included in Fluentd's core.

## Example Configuration

```
<source>
  @type unix
  path /path/to/socket.sock
</source>
```

Refer to the [Configuration File](/configuration/config-file.md) article for the basic structure and syntax of the configuration file.

## Parameters

### `@type` (required)

The value must be `unix`.

### `path`

|  type  |                  default                  | version |
| :----: | :---------------------------------------: | :-----: |
| string | `/var/run/fluent/fluent.sock` (see below) |  0.14.0 |

The path to your Unix Domain Socket.

Fluentd will use the environment variable `FLUENT_SOCKET` if defined.

### `backlog`

|   type  | default | version |
| :-----: | :-----: | :-----: |
| integer |   1024  |  0.14.0 |

The backlog of Unix Domain Socket.

### `tag`

| type   | default | version |
| ------ | ------- | ------- |
| string | nil     | 1.11.0  |

`in_unix` uses incoming event's tag by default. If the `tag` parameter is set, its value is used instead.

If this article is incorrect or outdated, or omits critical information, please [let us know](https://github.com/fluent/fluentd-docs-gitbook/issues?state=open). [Fluentd](http://www.fluentd.org/) is an open-source project under [Cloud Native Computing Foundation (CNCF)](https://cncf.io/). All components are available under the Apache 2 License.