docker-api-attach-stream-test.rb

require 'docker'

container = Docker::Container.create(
  'Image' => 'ubuntu:latest',
  'Cmd' => [
    '/bin/bash',
    '-c',
    'for i in {1..10}; do echo $i; sleep 1; done'
  ]
)

container.tap(&:start).attach do |stream, chunk|
  puts "#{Time.now.inspect}: #{stream}: #{chunk}"
end

## should print something like:
# 2014-06-28 10:14:20 -0400: stdout: 1
# 2014-06-28 10:14:21 -0400: stdout: 2
# 2014-06-28 10:14:22 -0400: stdout: 3
# 2014-06-28 10:14:23 -0400: stdout: 4
# 2014-06-28 10:14:24 -0400: stdout: 5
# 2014-06-28 10:14:25 -0400: stdout: 6
# 2014-06-28 10:14:26 -0400: stdout: 7
# 2014-06-28 10:14:27 -0400: stdout: 8
# 2014-06-28 10:14:28 -0400: stdout: 9
# 2014-06-28 10:14:29 -0400: stdout: 10