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108 lines
3.5 KiB
Plaintext
108 lines
3.5 KiB
Plaintext
---
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layout: docs
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page_title: 'nomad job action command reference'
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description: |
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The `nomad job action` command executes predefined actions from a job
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specification in a running task context.
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---
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# `nomad job action` command reference
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**Alias: `nomad action`**
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The `job action` command allows operators to execute predefined actions declared
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in Nomad job specifications. These actions can be defined at task level and are
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intended for specific operational tasks, such as clearing a cache, or migrating
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a database.
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An action may self-terminate upon completion (for example, echoing a string),
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or run for an indeterminate amount of time (for example, watching a blocking
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query). In the latter case, an action can be terminated via escape character
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(such as cmd+c / ctrl+c)
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When ACLs are enabled, this command requires a token with the `alloc-exec`,
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`read-job`, and `list-jobs` capabilities for the allocation's namespace. If
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the task driver does not have file system isolation (as with `raw_exec`),
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this command requires the `alloc-node-exec`, `alloc-exec`, `read-job`, and
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`list-jobs` capabilities for the allocation's namespace.
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## Usage
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```plaintext
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nomad job action [options] <action>
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```
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The `job action` command requires an action name and accepts two ways of
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specifying where it should run:
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- by passing the job name and known allocation ID along with the name of the action
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- by passing the job, task group, and task name along with the name of the action
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(when the allocation ID is not known). A random allocation will be selected if
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multiple are available.
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The action name provided must be defined within a task in the [job specification]
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provided. With sufficient privileges, an execution context will be opened and
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the defined action command will be run. No further input is possible, save for
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the escape character to terminate execution, so interactive commands are not
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supported.
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## Options
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- `-job`: (Required) Specifies the job containing the predefined action.
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- `-alloc`: Specifies the allocation within which the action is to be executed.
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If omitted, `-group` and `-task` must be provided, and a random
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allocation for the group will be selected.
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- `-task`: Specifies the task within the job where the action is defined. This
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is required either if `-alloc` provided and your group has multiple tasks,
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or if you specify a `-group`.
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- `-group`: Specifies the task group within the job. If present, a random
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allocation is selected. If omitted, `-alloc` must be provided.
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- `-i`: Pass stdin to the action, defaults to `true`. Pass `-i=false` to
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disable explicitly.
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- `-t`: Allocate a pseudo-tty, defaults to `true` if stdin is detected to be a tty
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session. Pass `-t=false` to disable explicitly.
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- `-e` `<escape_char>`: Sets the escape character for sessions with a pty,
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defaults to '~'. The escape character is only recognized at the beginning of a
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line. The escape character followed by a dot (`.`) closes the connection.
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Setting the character to `none` disables any escapes and makes the session
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fully transparent.
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## Examples
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Execute an action within a specific task in a job:
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```shell-session
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$ nomad action \
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-group=my-group \
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-task=my-task \
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-job=my-job \
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weather
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Toronto: ☁️ +3°C
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```
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Execute an action within a specific allocation:
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```shell-session
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$ nomad action \
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-alloc=f200a789-6da4-504c-d131-6181764f101e \
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-job=actions-demo \
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echo-time
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Running for 0 seconds
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Running for 1 seconds
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Running for 2 seconds
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Running for 3 seconds
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```
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## General options
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@include 'general_options.mdx'
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[job specification]: /nomad/docs/job-specification
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