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Note dockerfile-rails gem requirement in Rails Dockerfiles guide #2421

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kcmartin merged 1 commit into from
Jul 2, 2026
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Note dockerfile-rails gem requirement in Rails Dockerfiles guide #2421

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4 changes: 4 additions & 0 deletions rails/getting-started/dockerfiles.html.md
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---
title: Dockerfiles and fly.toml

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[vale] reported by reviewdog 🐶
[Fly.Spelling] Is 'Dockerfiles' a typo?

Raw Output:
{"message": "[Fly.Spelling] Is 'Dockerfiles' a typo?", "location": {"path": "rails/getting-started/dockerfiles.html.md", "range": {"start": {"line": 2, "column": 8}}}, "severity": "INFO"}
layout: framework_docs
order: 4
redirect_from: /rails/getting-started/dockerfiles/
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bin/rails generate dockerfile
```

<div class="note icon">
If you get a `Could not find generator 'dockerfile'.` error, your app predates the `dockerfile-rails` gem. Add [dockerfile-rails](https://github.com/rubys/dockerfile-rails) to your Gemfile and run `bundle install` first.
</div>

The generator will remember the options you selected before (these are
stored in `config/dockerfile.yml`). If you need to change a boolean
option, add or remove a `no-` prefix before the option name.
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to remain within or near the free allowances, and to apps that want to scale
to be able to handle a large number of concurrent connections.

Both [fullstaq](https://fullstaqruby.org/) and [jemalloc](https://jemalloc.net/) are used by many to reduce their memory footprint. As every application is different, test your application to see if either are appropriate for you. Enabling one or both can be done by regenerating your Dockerfile and specifying the appropriate option(s):

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[Fly.Spelling] Is 'jemalloc' a typo?

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{"message": "[Fly.Spelling] Is 'jemalloc' a typo?", "location": {"path": "rails/getting-started/dockerfiles.html.md", "range": {"start": {"line": 82, "column": 49}}}, "severity": "INFO"}

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[Fly.Spelling] Is 'fullstaq' a typo?

Raw Output:
{"message": "[Fly.Spelling] Is 'fullstaq' a typo?", "location": {"path": "rails/getting-started/dockerfiles.html.md", "range": {"start": {"line": 82, "column": 7}}}, "severity": "INFO"}

```cmd
bin/rails generate dockerfile --fullstaq --jemalloc
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