95 lines
2.1 KiB
Markdown
95 lines
2.1 KiB
Markdown
---
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layout: "docs"
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page_title: "meta Stanza - Job Specification"
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sidebar_current: "docs-job-specification-meta"
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description: |-
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The "meta" stanza allows for user-defined arbitrary key-value pairs.
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---
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# `meta` Stanza
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<table class="table table-bordered table-striped">
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<tr>
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<th width="120">Placement</th>
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<td>
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<code>job -> **meta**</code>
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<br>
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<code>job -> group -> **meta**</code>
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<br>
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<code>job -> group -> task -> **meta**</code>
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</td>
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</tr>
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</table>
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The `meta` stanza allows for user-defined arbitrary key-value pairs. It is
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possible to use the `meta` stanza at the [job][], [group][], or [task][] level.
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```hcl
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job "docs" {
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meta {
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my-key = "my-value"
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}
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group "example" {
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meta {
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my-key = "my-value"
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}
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task "server" {
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meta {
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my-key = "my-value"
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}
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}
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}
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}
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```
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Metadata is merged up the job specification, so metadata defined at the job
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level applies to all groups and tasks within that job. Metadata defined at the
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group layer applies to all tasks within that group.
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## `meta` Parameters
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The "parameters" for the `meta` stanza can be any key-value. The keys and values
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are both of type `string`, but they can be specified as other types. They will
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automatically be converted to strings.
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## `meta` Examples
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The following examples only show the `meta` stanzas. Remember that the
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`meta` stanza is only valid in the placements listed above.
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### Coercion
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This example shows the different ways to specify key-value pairs. Internally,
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these values will be stored as their string representation. No type information
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is preserved.
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```hcl
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meta {
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key = "true"
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key = true
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"key" = true
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key = 1.4
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key = "1.4"
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}
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```
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### Interpolation
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This example shows using [Nomad interpolation][interpolation] to populate
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environment variables.
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```hcl
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meta {
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class = "${nomad.class}"
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}
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```
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[job]: /docs/job-specification/job.html "Nomad job Job Specification"
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[group]: /docs/job-specification/group.html "Nomad group Job Specification"
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[task]: /docs/job-specification/task.html "Nomad task Job Specification"
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[interpolation]: /docs/runtime/interpolation.html "Nomad interpolation"
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