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* action page * change all page_title fields * update title * constraint through migrate pages * update page title and heading to use sentence case * fix front matter description * Apply suggestions from code review Co-authored-by: Jeff Boruszak <104028618+boruszak@users.noreply.github.com> --------- Co-authored-by: Jeff Boruszak <104028618+boruszak@users.noreply.github.com>
87 lines
2.5 KiB
Plaintext
87 lines
2.5 KiB
Plaintext
---
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layout: docs
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page_title: change_script block in the job specification
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description: |-
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Configure template change scripts in the `change_script` block of the Nomad job specification. Nomad executes these scripts when a template changes. Configure the command, arguments, and timeout. Enable fail on error. Review an example of how to embed a script in the data block of a template block.
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---
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# `change_script` block in the job specification
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<Placement groups={['job', 'group', 'task', 'template', 'change_script']} />
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The `change_script` block allows operators to configure scripts that
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will be executed on template change. This block is only used when template
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`change_mode` is set to `script`.
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```hcl
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job "docs" {
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group "example" {
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task "server" {
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template {
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source = "local/redis.conf.tpl"
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destination = "local/redis.conf"
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change_mode = "script"
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change_script {
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command = "/bin/foo"
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args = ["-verbose", "-debug"]
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timeout = "5s"
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fail_on_error = false
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}
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}
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}
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}
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}
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```
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## `change_script` Parameters
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- `command` `(string: "")` - Specifies the full path to a script or executable
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that is to be executed on template change. The command must return exit code 0
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to be considered successful. Path is relative to the driver, e.g., if running
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with a container driver the path must be existing in the container. This option
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is required if `change_mode` is `script`.
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- `args` `(array<string>: [])` - List of arguments that are passed to the script
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that is to be executed on template change.
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- `timeout` `(string: "5s")` - Timeout for script execution specified using a
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label suffix like `"30s"` or `"1h"`.
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- `fail_on_error` `(bool: false)` - If `true`, Nomad will kill the task if the
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script execution fails. If `false`, script failure will be logged but the task
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will continue uninterrupted.
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### Example
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Below is an example of how a script can be embedded in a `data` block of another
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`template` block:
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```hcl
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job "docs" {
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group "example" {
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task "server" {
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template {
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data = "{{key \"my_key\"}}"
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destination = "local/test"
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change_mode = "script"
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change_script {
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command = "/local/script.sh"
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}
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}
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template {
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data = <<EOF
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#!/usr/bin/env bash
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echo "Running change_mode script"
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sleep 10
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echo "Done"
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EOF
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destination = "local/script.sh"
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perms = "777"
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}
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}
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}
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}
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```
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