github.com/kardianos/nomad@v0.1.3-0.20151022182107-b13df73ee850/website/source/docs/drivers/exec.html.md (about) 1 --- 2 layout: "docs" 3 page_title: "Drivers: Exec" 4 sidebar_current: "docs-drivers-exec" 5 description: |- 6 The Exec task driver is used to run binaries using OS isolation primitives. 7 --- 8 9 # Isolated Fork/Exec Driver 10 11 Name: `exec` 12 13 The `exec` driver is used to simply execute a particular command for a task. 14 However unlike [`raw_exec`](raw_exec.html) it uses the underlying isolation 15 primitives of the operating system to limit the tasks access to resources. While 16 simple, since the `exec` driver can invoke any command, it can be used to call 17 scripts or other wrappers which provide higher level features. 18 19 ## Task Configuration 20 21 The `exec` driver supports the following configuration in the job spec: 22 23 * `command` - The command to execute. Must be provided. 24 25 * `args` - The argument list to the command, space seperated. Optional. 26 27 ## Client Requirements 28 29 The `exec` driver can run on all supported operating systems but to provide 30 proper isolation the client must be run as root on non-Windows operating systems. 31 Further, to support cgroups, `/sys/fs/cgroups/` must be mounted. 32 33 ## Client Attributes 34 35 The `exec` driver will set the following client attributes: 36 37 * `driver.exec` - This will be set to "1", indicating the 38 driver is available. 39 40 ## Resource Isolation 41 42 The resource isolation provided varies by the operating system of 43 the client and the configuration. 44 45 On Linux, Nomad will use cgroups, namespaces, and chroot to isolate the 46 resources of a process and as such the Nomad agent must be run as root. 47 48 On Windows, the task driver will just execute the command with no additional 49 resource isolation.