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Document Ferrum's Docker container mode #323

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Merged
route merged 3 commits into from
Aug 21, 2026
Merged

Document Ferrum's Docker container mode #323

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9f6bb8e
Enhance README with Docker and Cuprite instructions
ablzh Aug 21, 2026
df32fc2
Revise Docker Chrome setup instructions
ablzh Aug 21, 2026
d10a1d7
Update README with Ferrum container mode details
ablzh Aug 21, 2026
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19 changes: 17 additions & 2 deletions README.md
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Expand Up @@ -27,12 +27,27 @@ Capybara.register_driver(:cuprite) do |app|
end
```

if you use `Docker` don't forget to pass `no-sandbox` option:
If Chrome or Chromium cannot use its sandbox inside a container—for example,
because it runs as `root`—enable Ferrum's container mode:

```ruby
Capybara::Cuprite::Driver.new(app, browser_options: { 'no-sandbox': nil })
Capybara::Cuprite::Driver.new(app, dockerize: true)
```

The `dockerize` option requires Ferrum 0.17.2 or newer. With an older Ferrum
version, pass the browser option explicitly:

```ruby
Capybara::Cuprite::Driver.new(
app,
browser_options: { "no-sandbox" => nil }
)
```

Both approaches disable the browser's sandbox, so do not use them merely
because Docker is involved. Prefer running the browser as a non-root user with
a working sandbox when possible.

Since Cuprite uses [Ferrum](https://github.com/rubycdp/ferrum#examples) there
are many useful methods you can call even using this driver:

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