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---
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description: >
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2020-06-02 11:51:33 +02:00
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The variable block, also called the input-variable block, defines variables
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within your Packer configuration.
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page_title: variable - Blocks
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sidebar_title: <tt>variable</tt>
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---
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# The `variable` block
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`@include 'from-1.5/beta-hcl2-note.mdx'`
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2020-06-02 11:58:01 +02:00
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The `variable` block, also called the `input-variable` block, defines variables
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within your Packer configuration. An input-variable cannot be used in another
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input variable: we recommend using [locals](/docs/templates/hcl_templates/blocks/locals) for that instead.
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`@include 'from-1.5/variables/foo-block.mdx'`
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## Default value
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If a default value is set, the variable is optional. Otherwise, the variable
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**must** be set.
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`@include 'from-1.5/variables/assignment.mdx'`
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2020-11-02 17:20:46 +01:00
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`@include 'from-1.5/variables/custom-validation.mdx'`
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Example of a variable assignment from a file:
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`@include 'from-1.5/variables/foo-pkrvar.mdx'`
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`@include 'from-1.5/variables/must-be-set.mdx'`
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2020-10-05 15:27:12 +02:00
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`@include 'from-1.5/variables/sensitive.mdx'`
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# More on variables
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- Read the [full variables](/docs/templates/hcl_templates/variables) description for a more
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thorough read.
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- Read the [variables guide](/guides/hcl/variables) for more examples.
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