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Alex Dadgar 2015-11-03 12:57:39 -08:00
parent d83777f198
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website/source/docs/drivers/exec.html.md
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@ -11,7 +11,7 @@ description: |-
Name: `exec`
The `exec` driver is used to simply execute a particular command for a task.
However unlike [`raw_exec`](raw_exec.html) it uses the underlying isolation
However, unlike [`raw_exec`](raw_exec.html) it uses the underlying isolation
primitives of the operating system to limit the tasks access to resources. While
simple, since the `exec` driver can invoke any command, it can be used to call
scripts or other wrappers which provide higher level features.
@ -28,9 +28,10 @@ must reference it in the `command` as show in the examples below
## Client Requirements
The `exec` driver can run on all supported operating systems but to provide
proper isolation the client must be run as root on non-Windows operating systems.
Further, to support cgroups, `/sys/fs/cgroups/` must be mounted.
The `exec` driver can only be run when on Linux and running Nomad as root.
`exec` is limited to this configuration because currently isolation of resources
is only guaranteed on Linux. Further the host must have cgroups mounted properly
in order for the driver to work.
You must specify a `command` to be executed. Optionally you can specify an
`artifact_source` to be downloaded as well. Any `command` is assumed to be present on the
@ -68,8 +69,5 @@ The `exec` driver will set the following client attributes:
The resource isolation provided varies by the operating system of
the client and the configuration.
On Linux, Nomad will use cgroups, namespaces, and chroot to isolate the
On Linux, Nomad will use cgroups, and a chroot to isolate the
resources of a process and as such the Nomad agent must be run as root.
On Windows, the task driver will just execute the command with no additional
resource isolation.