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

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docs	Drivers: Raw Exec	docs-drivers-raw-exec	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 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 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.