我看到了许多解决此问题的方法，但没有任何方法可以解决我的问题！ 在Rails应用程序中为我的Ruby添加404错误html页面后，出现了此错误
!pip install -q "fastai==0.7.0" Pillow==4.1.1 torchtext==0.2.3
!apt-get -qq install -y libsm6 libxext6 && pip install -q -U opencv-python
from wheel.pep425tags import get_abbr_impl, get_impl_ver, get_abi_tag
platform = '{}{}-{}'.format(get_abbr_impl(), get_impl_ver(), get_abi_tag())
# !apt update -q
!apt install -y libsm6 libxext6
from os import path
accelerator = 'cu80' if path.exists('/opt/bin/nvidia-smi') else 'cpu'
torch_whl = f"http://download.pytorch.org/whl/{accelerator}/torch-0.3.0.post4-{platform}-linux_x86_64.whl"
!pip install -q {torch_whl} torchvision image
将这一行添加到production.rb
ActiveRecord::ConnectionTimeoutError (could not obtain a database connection within 5.000 seconds (waited 5.000 seconds)):
2018-12-22T06:37:29.341798+00:00 app[web.1]: vendor/bundle/ruby/2.0.0/gems/activerecord-4.1.8/lib/active_record/connection_adapters/abstract/connection_pool.rb:190:in `block in wait_poll'
2018-12-22T06:37:29.341800+00:00 app[web.1]: vendor/bundle/ruby/2.0.0/gems/activerecord-4.1.8/lib/active_record/connection_adapters/abstract/connection_pool.rb:181:in `loop'
2018-12-22T06:37:29.341802+00:00 app[web.1]: vendor/bundle/ruby/2.0.0/gems/activerecord-4.1.8/lib/active_record/connection_adapters/abstract/connection_pool.rb:181:in `wait_poll'
2018-12-22T06:37:29.341804+00:00 app[web.1]: vendor/bundle/ruby/2.0.0/gems/activerecord-4.1.8/lib/active_record/connection_adapters/abstract/connection_pool.rb:136:in `block in poll'
2018-12-22T06:37:29.341806+00:00 app[web.1]: vendor/ruby-2.0.0/lib/ruby/2.0.0/monitor.rb:211:in `mon_synchronize'
2018-12-22T06:37:29.341808+00:00 app[web.1]: vendor/bundle/ruby/2.0.0/gems/activerecord-4.1.8/lib/active_record/connection_adapters/abstract/connection_pool.rb:146:in `synchronize'
2018-12-22T06:37:29.341810+00:00 app[web.1]: vendor/bundle/ruby/2.0.0/gems/activerecord-4.1.8/lib/active_record/connection_adapters/abstract/connection_pool.rb:134:in `poll'
2018-12-22T06:37:29.341812+00:00 app[web.1]: vendor/bundle/ruby/2.0.0/gems/activerecord-4.1.8/lib/active_record/connection_adapters/abstract/connection_pool.rb:418:in `acquire_connection'
2018-12-22T06:37:29.341814+00:00 app[web.1]: vendor/bundle/ruby/2.0.0/gems/activerecord-4.1.8/lib/active_record/connection_adapters/abstract/connection_pool.rb:351:in `block in checkout'
2018-12-22T06:37:29.341816+00:00 app[web.1]: vendor/ruby-2.0.0/lib/ruby/2.0.0/monitor.rb:211:in `mon_synchronize'
2018-12-22T06:37:29.341818+00:00 app[web.1]: vendor/bundle/ruby/2.0.0/gems/activerecord-4.1.8/lib/active_record/connection_adapters/abstract/connection_pool.rb:350:in `checkout'
2018-12-22T06:37:29.341820+00:00 app[web.1]: vendor/bundle/ruby/2.0.0/gems/activerecord-4.1.8/lib/active_record/connection_adapters/abstract/connection_pool.rb:265:in `block in connection'
2018-12-22T06:37:29.341821+00:00 app[web.1]: vendor/ruby-2.0.0/lib/ruby/2.0.0/monitor.rb:211:in `mon_synchronize'
2018-12-22T06:37:29.341823+00:00 app[web.1]: vendor/bundle/ruby/2.0.0/gems/activerecord-4.1.8/lib/active_record/connection_adapters/abstract/connection_pool.rb:264:in `connection'
2018-12-22T06:37:29.341825+00:00 app[web.1]: vendor/bundle/ruby/2.0.0/gems/activerecord-4.1.8/lib/active_record/connection_adapters/abstract/connection_pool.rb:541:in `retrieve_connection'
2018-12-22T06:37:29.341827+00:00 app[web.1]: vendor/bundle/ruby/2.0.0/gems/activerecord-4.1.8/lib/active_record/connection_handling.rb:113:in `retrieve_connection'
2018-12-22T06:37:29.341829+00:00 app[web.1]: vendor/bundle/ruby/2.0.0/gems/activerecord-4.1.8/lib/active_record/connection_handling.rb:87:in `connection'
2018-12-22T06:37:29.341831+00:00 app[web.1]: vendor/bundle/ruby/2.0.0/gems/activerecord-4.1.8/lib/active_record/query_cache.rb:51:in `restore_query_cache_settings'
2018-12-22T06:37:29.341833+00:00 app[web.1]: vendor/bundle/ruby/2.0.0/gems/activerecord-4.1.8/lib/active_record/query_cache.rb:43:in `rescue in call'
2018-12-22T06:37:29.341834+00:00 app[web.1]: vendor/bundle/ruby/2.0.0/gems/activerecord-4.1.8/lib/active_record/query_cache.rb:32:in `call'
2018-12-22T06:37:29.341836+00:00 app[web.1]: vendor/bundle/ruby/2.0.0/gems/activerecord-4.1.8/lib/active_record/connection_adapters/abstract/connection_pool.rb:621:in `call'
2018-12-22T06:37:29.341838+00:00 app[web.1]: vendor/bundle/ruby/2.0.0/gems/actionpack-4.1.8/lib/action_dispatch/middleware/callbacks.rb:29:in `block in call'
2018-12-22T06:37:29.341840+00:00 app[web.1]: vendor/bundle/ruby/2.0.0/gems/activesupport-4.1.8/lib/active_support/callbacks.rb:82:in `run_callbacks'
2018-12-22T06:37:29.341841+00:00 app[web.1]: vendor/bundle/ruby/2.0.0/gems/actionpack-4.1.8/lib/action_dispatch/middleware/callbacks.rb:27:in `call'
2018-12-22T06:37:29.341843+00:00 app[web.1]: vendor/bundle/ruby/2.0.0/gems/actionpack-4.1.8/lib/action_dispatch/middleware/remote_ip.rb:76:in `call'
2018-12-22T06:37:29.341845+00:00 app[web.1]: vendor/bundle/ruby/2.0.0/gems/actionpack-4.1.8/lib/action_dispatch/middleware/debug_exceptions.rb:17:in `call'
2018-12-22T06:37:29.341847+00:00 app[web.1]: vendor/bundle/ruby/2.0.0/gems/actionpack-4.1.8/lib/action_dispatch/middleware/show_exceptions.rb:30:in `call'
2018-12-22T06:37:29.341849+00:00 app[web.1]: vendor/bundle/ruby/2.0.0/gems/railties-4.1.8/lib/rails/rack/logger.rb:38:in `call_app'
2018-12-22T06:37:29.341850+00:00 app[web.1]: vendor/bundle/ruby/2.0.0/gems/railties-4.1.8/lib/rails/rack/logger.rb:20:in `block in call'
2018-12-22T06:37:29.341852+00:00 app[web.1]: vendor/bundle/ruby/2.0.0/gems/activesupport-4.1.8/lib/active_support/tagged_logging.rb:68:in `block in tagged'
2018-12-22T06:37:29.341854+00:00 app[web.1]: vendor/bundle/ruby/2.0.0/gems/activesupport-4.1.8/lib/active_support/tagged_logging.rb:26:in `tagged'
2018-12-22T06:37:29.341855+00:00 app[web.1]: vendor/bundle/ruby/2.0.0/gems/activesupport-4.1.8/lib/active_support/tagged_logging.rb:68:in `tagged'
2018-12-22T06:37:29.341857+00:00 app[web.1]: vendor/bundle/ruby/2.0.0/gems/railties-4.1.8/lib/rails/rack/logger.rb:20:in `call'
2018-12-22T06:37:29.341858+00:00 app[web.1]: vendor/bundle/ruby/2.0.0/gems/actionpack-4.1.8/lib/action_dispatch/middleware/request_id.rb:21:in `call'
2018-12-22T06:37:29.341925+00:00 app[web.1]: vendor/bundle/ruby/2.0.0/gems/rack-1.5.5/lib/rack/methodoverride.rb:21:in `call'
2018-12-22T06:37:29.341928+00:00 app[web.1]: vendor/bundle/ruby/2.0.0/gems/rack-1.5.5/lib/rack/runtime.rb:17:in `call'
2018-12-22T06:37:29.341930+00:00 app[web.1]: vendor/bundle/ruby/2.0.0/gems/activesupport-4.1.8/lib/active_support/cache/strategy/local_cache_middleware.rb:26:in `call'
2018-12-22T06:37:29.341937+00:00 app[web.1]: vendor/bundle/ruby/2.0.0/gems/actionpack-4.1.8/lib/action_dispatch/middleware/static.rb:84:in `call'
2018-12-22T06:37:29.341939+00:00 app[web.1]: vendor/bundle/ruby/2.0.0/gems/rack-1.5.5/lib/rack/sendfile.rb:112:in `call'
2018-12-22T06:37:29.341941+00:00 app[web.1]: vendor/bundle/ruby/2.0.0/gems/railties-4.1.8/lib/rails/engine.rb:514:in `call'
2018-12-22T06:37:29.341942+00:00 app[web.1]: vendor/bundle/ruby/2.0.0/gems/railties-4.1.8/lib/rails/application.rb:144:in `call'
2018-12-22T06:37:29.341944+00:00 app[web.1]: vendor/bundle/ruby/2.0.0/gems/rack-1.5.5/lib/rack/lock.rb:17:in `call'
2018-12-22T06:37:29.341945+00:00 app[web.1]: vendor/bundle/ruby/2.0.0/gems/rack-1.5.5/lib/rack/content_length.rb:14:in `call'
2018-12-22T06:37:29.341947+00:00 app[web.1]: vendor/bundle/ruby/2.0.0/gems/rack-1.5.5/lib/rack/handler/webrick.rb:60:in `service'
2018-12-22T06:37:29.341948+00:00 app[web.1]: vendor/ruby-2.0.0/lib/ruby/2.0.0/webrick/httpserver.rb:138:in `service'
2018-12-22T06:37:29.341950+00:00 app[web.1]: vendor/ruby-2.0.0/lib/ruby/2.0.0/webrick/httpserver.rb:94:in `run'
2018-12-22T06:37:29.341952+00:00 app[web.1]: vendor/ruby-2.0.0/lib/ruby/2.0.0/webrick/server.rb:295:in `block in start_thread'
2018-12-22T06:37:29.341953+00:00 app[web.1]:
routes.rb
config.exceptions_app = self.routes
errors.controller.rb
get '/404', to: 'errors#not_found'
get '/422', to: 'errors#unacceptable'
我不确定如何解决此问题，请帮忙！
答案 0 :(得分：0)
在链接以下一次结帐以配置database.yml，
pool: 5
timeout: 5000