open-nomad/website/source/docs/drivers/raw_exec.html.md

---
layout: "docs"
page_title: "Drivers: Raw Exec"
sidebar_current: "docs-drivers-raw-exec"
description: |-
  The Raw Exec task driver simply fork/execs and provides no isolation.
---

# Raw Fork/Exec Driver

Name: `raw_exec`

The `raw_exec` driver is used to execute a command for a task without any
isolation. Further, the task is started as the same user as the Nomad process.
As such, it should be used with extreme care and is disabled by default.

## Task Configuration

The `raw_exec` driver supports the following configuration in the job spec:

* `command` - The command to execute. Must be provided.

* `artifact_source` – (Optional) Source location of an executable artifact. Must
  be accessible from the Nomad client. If you specify an `artifact_source` to be
  executed, you must reference it in the `command` as show in the examples below

* `checksum` - (Optional) The checksum type and value for the `artifact_source`
  image.  The format is `type:value`, where type is any of `md5`, `sha1`,
  `sha256`, or `sha512`, and the value is the computed checksum. If a checksum
  is supplied and does not match the downloaded artifact, the driver will fail
  to start

*   `args` - (Optional) A list of arguments to the optional `command`.
    References to environment variables or any [intepretable Nomad
    variables](/docs/jobspec/index.html#interpreted_vars) will be interpreted
    before launching the task. For example:

    ```
        args = ["${nomad.ip}", "${MY_ENV}", "${meta.foo}"]
    ```

## Client Requirements

The `raw_exec` driver can run on all supported operating systems. It is however
disabled by default. In order to be enabled, the Nomad client configuration must
explicitly enable the `raw_exec` driver in the client's
[options](../agent/config.html#options) field:

```
  client {
    options = {
        "driver.raw_exec.enable" = "1"
    }
  }
```

You must specify a `command` to be executed. Optionally you can specify an
`artifact_source` to be executed. Any `command` is assumed to be present on the 
running client, or a downloaded artifact

## Examples

To run a binary present on the Node:

```
  config {
    command = "/bin/sleep"
    args = 1
  }
```

To execute a binary specified by `artifact_source`:

```
  config {
    artifact_source = "https://dl.dropboxusercontent.com/u/1234/binary.bin"
    checksum = "sha256:133jifjiofu9090fsadjofsdjlk"
    command = "binary.bin"
  }
```

## Client Attributes

The `raw_exec` driver will set the following client attributes:

* `driver.raw_exec` - This will be set to "1", indicating the
  driver is available.

## Resource Isolation

The `raw_exec` driver provides no isolation.