---
type: resource-type
title: Secret
description: fly resource type Fly::Machines::Secret
name: Secret
lexicon: fly
resource_type: Fly::Machines::Secret
---
`Fly::Machines::Secret`, a resource type of the fly lexicon.

## Properties

- `value` (`string`, optional)

## Governed by

- [FLY004](/rules/FLY004.md): No secret literals in machine config