Capybara headless chrome in docker returns DevToolsActivePort file doesn't exist

Question

Im trying to configure system tests to work with headless chrome in selenium. I have the following capybara configuration:

# spec/support/capybara.rb

Capybara.s         


        

Answer 1

It seems like the default selenium_chrome_headless settings of capybara aren't sufficient for running in a docker container. I have solved it by changing my spec/support/capybara.rb settings to the following:

# spec/support/capybara.rb

# Setup chrome headless driver
Capybara.server = :puma, { Silent: true }

Capybara.register_driver :chrome_headless do |app|
  options = ::Selenium::WebDriver::Chrome::Options.new

  options.add_argument('--headless')
  options.add_argument('--no-sandbox')
  options.add_argument('--disable-dev-shm-usage')
  options.add_argument('--window-size=1400,1400')

  Capybara::Selenium::Driver.new(app, browser: :chrome, options: options)
end

Capybara.javascript_driver = :chrome_headless

# Setup rspec
RSpec.configure do |config|
  config.before(:each, type: :system) do
    driven_by :rack_test
  end

  config.before(:each, type: :system, js: true) do
    driven_by :chrome_headless
  end
end

Especially "--disable-dev-shm-usage" should not be forgotten, as it solves limited resource problems in docker, as noted in: https://github.com/GoogleChrome/puppeteer/issues/1834

Edit: I haven't made any changes to the above Dockerfile