85 lines
1.9 KiB
Markdown
85 lines
1.9 KiB
Markdown
---
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layout: "docs"
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page_title: "env Stanza - Job Specification"
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sidebar_current: "docs-job-specification-env"
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description: |-
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The "env" stanza configures a list of environment variables to populate the
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task's environment before starting.
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---
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# `env` 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 -> group -> task -> **env**</code>
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</td>
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</tr>
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</table>
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The `env` stanza configures a list of environment variables to populate the
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task's environment before starting.
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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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env {
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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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## `env` Parameters
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The "parameters" for the `env` 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. Invalid characters such as dashes (`-`)
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will be converted to underscores.
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## `env` Examples
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The following examples only show the `env` stanzas. Remember that the
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`env` 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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env {
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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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env {
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NODE_CLASS = "${node.class}"
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}
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```
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### Dynamic Environment Variables
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Nomad also supports populating dynamic environment variables from data stored in
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HashiCorp Consul and Vault. To use this feature please see the documentation on
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the [`template` stanza][template-env].
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[interpolation]: /docs/runtime/interpolation.html "Nomad interpolation"
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[template-env]: /docs/job-specification/template.html#environment-variables "Nomad template Stanza"
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