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--- title: App configuration (fly.toml) layout: docs nav: firecracker --- You can configure an app for deployment on Fly.io using a `fly.toml` file. Configuration of builds, environment variables, internet-exposed services, disk mounts, and release commands go here. `fly.toml` configuration applies for apps managed by [Fly Launch commands](/docs/launch/). ## App configuration files Most of the time you'll use the `fly.toml` file that you get automatically when you run `fly launch` to create an app. There are also ways to re-use config files and to generate them in different formats. ### Ways to get a config file - Run [`flyctl launch`](/docs/flyctl/launch/) in your project source directory to create a new app and `fly.toml` file automatically. - Run [`flyctl config save -a <existing-app-name>`](/docs/flyctl/config-save/) to download a `fly.toml` file from an existing app. - Create one by hand with help from this reference, or copy and modify an example file.
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