【发布时间】：2017-07-31 07:08:18
【问题描述】：
我最近决定从 Heroku 切换到通过他们的 Elastic Beanstalk 服务直接部署到 AWS - 希望我的术语是正确的，仍然可以理解 AWS。我的应用程序在 EB 和 Heroku 上运行（这是一个免费的 Heroku 应用程序，因此可能需要 10 秒才能启动）。该应用程序在 Heroku 上完美运行，但在 EB 上仅有时会加载。可能有 4 次中有 1 次得到Internal Server Error。我的数据库池设置为 5，如果我将其扩展到 25，它可以工作，但我是唯一使用该网站的人，据我所知，5 应该足够了。
这是我的 database.yml：
development:
adapter: sqlite3
database: db/website.db
pool: 5
timeout: 5000
test:
adapter: sqlite3
database: db/cucumber-tests.db
pool: 5
timeout: 5000
production:
adapter: postgresql
encoding: utf8
database: <%= ENV['RDS_DB_NAME'] %>
username: <%= ENV['RDS_USERNAME'] %>
password: <%= ENV['RDS_PASSWORD'] %>
pool: 5
host: <%= ENV['RDS_HOSTNAME'] %>
port: <%= ENV['RDS_PORT'] %>
旁注，在我弄清楚为什么池 5 不够之后，如何使池大小可扩展？据我所知，没有RDS_POOL 变量。有没有办法可以根据用户数量进行扩展？
这是我的 puma 错误日志：
-------------------------------------
/var/log/puma/puma.log
-------------------------------------
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/rack-protection-1.5.3/lib/rack/protection/xss_header.rb:18:in `call'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/rack-protection-1.5.3/lib/rack/protection/base.rb:49:in `call'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/rack-protection-1.5.3/lib/rack/protection/base.rb:49:in `call'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/rack-protection-1.5.3/lib/rack/protection/path_traversal.rb:16:in `call'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/rack-protection-1.5.3/lib/rack/protection/json_csrf.rb:18:in `call'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/rack-protection-1.5.3/lib/rack/protection/base.rb:49:in `call'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/rack-protection-1.5.3/lib/rack/protection/base.rb:49:in `call'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/rack-protection-1.5.3/lib/rack/protection/frame_options.rb:31:in `call'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/rack-1.6.5/lib/rack/session/abstract/id.rb:225:in `context'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/rack-1.6.5/lib/rack/session/abstract/id.rb:220:in `call'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/rack-1.6.5/lib/rack/nulllogger.rb:9:in `call'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/rack-1.6.5/lib/rack/head.rb:13:in `call'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/sinatra-1.4.8/lib/sinatra/base.rb:182:in `call'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/sinatra-1.4.8/lib/sinatra/base.rb:2013:in `call'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/sinatra-1.4.8/lib/sinatra/base.rb:1487:in `block in call'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/sinatra-1.4.8/lib/sinatra/base.rb:1787:in `synchronize'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/sinatra-1.4.8/lib/sinatra/base.rb:1487:in `call'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/rack-1.6.5/lib/rack/deflater.rb:35:in `call'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/puma-3.7.1/lib/puma/configuration.rb:232:in `call'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/puma-3.7.1/lib/puma/server.rb:578:in `handle_request'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/puma-3.7.1/lib/puma/server.rb:415:in `process_client'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/puma-3.7.1/lib/puma/server.rb:275:in `block in run'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/puma-3.7.1/lib/puma/thread_pool.rb:120:in `block in spawn_thread'
2017-03-10 03:43:14 - ActiveRecord::ConnectionTimeoutError - could not obtain a connection from the pool within 5.000 seconds (waited 5.000 seconds); all pooled connections were i
n use:
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/activerecord-5.0.2/lib/active_record/connection_adapters/abstract/connection_pool.rb:202:in `block in wait_poll'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/activerecord-5.0.2/lib/active_record/connection_adapters/abstract/connection_pool.rb:193:in `loop'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/activerecord-5.0.2/lib/active_record/connection_adapters/abstract/connection_pool.rb:193:in `wait_poll'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/activerecord-5.0.2/lib/active_record/connection_adapters/abstract/connection_pool.rb:154:in `internal_poll'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/activerecord-5.0.2/lib/active_record/connection_adapters/abstract/connection_pool.rb:278:in `internal_poll'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/activerecord-5.0.2/lib/active_record/connection_adapters/abstract/connection_pool.rb:148:in `block in poll'
/opt/rubies/ruby-2.3.1/lib/ruby/2.3.0/monitor.rb:214:in `mon_synchronize'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/activerecord-5.0.2/lib/active_record/connection_adapters/abstract/connection_pool.rb:158:in `synchronize'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/activerecord-5.0.2/lib/active_record/connection_adapters/abstract/connection_pool.rb:148:in `poll'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/activerecord-5.0.2/lib/active_record/connection_adapters/abstract/connection_pool.rb:717:in `acquire_connection'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/activerecord-5.0.2/lib/active_record/connection_adapters/abstract/connection_pool.rb:490:in `checkout'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/activerecord-5.0.2/lib/active_record/connection_adapters/abstract/connection_pool.rb:364:in `connection'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/activerecord-5.0.2/lib/active_record/connection_adapters/abstract/connection_pool.rb:883:in `retrieve_connection'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/activerecord-5.0.2/lib/active_record/connection_handling.rb:128:in `retrieve_connection'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/activerecord-5.0.2/lib/active_record/connection_handling.rb:91:in `connection'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/activerecord-5.0.2/lib/active_record/associations/join_dependency.rb:96:in `initialize'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/activerecord-5.0.2/lib/active_record/relation/finder_methods.rb:399:in `new'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/activerecord-5.0.2/lib/active_record/relation/finder_methods.rb:399:in `construct_join_dependency'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/activerecord-5.0.2/lib/active_record/relation/finder_methods.rb:321:in `exists?'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/activerecord-5.0.2/lib/active_record/querying.rb:3:in `exists?'
app/views/index.erb:66:in `block in singleton class'
app/views/index.erb:-6:in `instance_eval'
app/views/index.erb:-6:in `singleton class'
app/views/index.erb:-8:in `__tilt_47116404404940'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/tilt-2.0.6/lib/tilt/template.rb:161:in `call'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/tilt-2.0.6/lib/tilt/template.rb:161:in `evaluate'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/tilt-2.0.6/lib/tilt/template.rb:100:in `render'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/sinatra-1.4.8/lib/sinatra/base.rb:823:in `render'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/sinatra-1.4.8/lib/sinatra/base.rb:667:in `erb'
/var/app/current/app/controllers/application_controller.rb:60:in `block in <class:ApplicationController>'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/sinatra-1.4.8/lib/sinatra/base.rb:1611:in `call'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/sinatra-1.4.8/lib/sinatra/base.rb:1611:in `block in compile!'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/sinatra-1.4.8/lib/sinatra/base.rb:975:in `block (3 levels) in route!'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/sinatra-1.4.8/lib/sinatra/base.rb:994:in `route_eval'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/sinatra-1.4.8/lib/sinatra/base.rb:975:in `block (2 levels) in route!'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/sinatra-1.4.8/lib/sinatra/base.rb:1015:in `block in process_route'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/sinatra-1.4.8/lib/sinatra/base.rb:1013:in `catch'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/sinatra-1.4.8/lib/sinatra/base.rb:1013:in `process_route'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/sinatra-1.4.8/lib/sinatra/base.rb:973:in `block in route!'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/sinatra-1.4.8/lib/sinatra/base.rb:972:in `each'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/sinatra-1.4.8/lib/sinatra/base.rb:972:in `route!'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/sinatra-1.4.8/lib/sinatra/base.rb:1085:in `block in dispatch!'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/sinatra-1.4.8/lib/sinatra/base.rb:1067:in `block in invoke'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/sinatra-1.4.8/lib/sinatra/base.rb:1067:in `catch'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/sinatra-1.4.8/lib/sinatra/base.rb:1067:in `invoke'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/sinatra-1.4.8/lib/sinatra/base.rb:1082:in `dispatch!'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/sinatra-1.4.8/lib/sinatra/base.rb:907:in `block in call!'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/sinatra-1.4.8/lib/sinatra/base.rb:1067:in `block in invoke'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/sinatra-1.4.8/lib/sinatra/base.rb:1067:in `catch'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/sinatra-1.4.8/lib/sinatra/base.rb:1067:in `invoke'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/sinatra-1.4.8/lib/sinatra/base.rb:907:in `call!'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/sinatra-1.4.8/lib/sinatra/base.rb:895:in `call'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/rack-protection-1.5.3/lib/rack/protection/xss_header.rb:18:in `call'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/rack-protection-1.5.3/lib/rack/protection/base.rb:49:in `call'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/rack-protection-1.5.3/lib/rack/protection/base.rb:49:in `call'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/rack-protection-1.5.3/lib/rack/protection/path_traversal.rb:16:in `call'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/rack-protection-1.5.3/lib/rack/protection/json_csrf.rb:18:in `call'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/rack-protection-1.5.3/lib/rack/protection/base.rb:49:in `call'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/rack-protection-1.5.3/lib/rack/protection/base.rb:49:in `call'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/rack-protection-1.5.3/lib/rack/protection/frame_options.rb:31:in `call'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/rack-1.6.5/lib/rack/session/abstract/id.rb:225:in `context'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/rack-1.6.5/lib/rack/session/abstract/id.rb:220:in `call'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/rack-1.6.5/lib/rack/nulllogger.rb:9:in `call'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/rack-1.6.5/lib/rack/head.rb:13:in `call'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/sinatra-1.4.8/lib/sinatra/base.rb:182:in `call'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/sinatra-1.4.8/lib/sinatra/base.rb:2013:in `call'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/sinatra-1.4.8/lib/sinatra/base.rb:1487:in `block in call'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/sinatra-1.4.8/lib/sinatra/base.rb:1787:in `synchronize'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/sinatra-1.4.8/lib/sinatra/base.rb:1487:in `call'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/rack-1.6.5/lib/rack/deflater.rb:35:in `call'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/puma-3.7.1/lib/puma/configuration.rb:232:in `call'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/puma-3.7.1/lib/puma/server.rb:578:in `handle_request'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/puma-3.7.1/lib/puma/server.rb:415:in `process_client'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/puma-3.7.1/lib/puma/server.rb:275:in `block in run'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/puma-3.7.1/lib/puma/thread_pool.rb:120:in `block in spawn_thread'
- 所有代码都是开源的，可以在here找到-
谢谢。非常感谢任何帮助。
更新：我不能再让这个应用程序宕机了。我现在将池设置为 25。我还更改了 DSN，所以 old app can be found here 和 the new app here
更新 2：我添加了 ruby-on-rails 标签以获得更多关注，因为这个问题是相关的，但该项目使用的是 Sinatra 而不是 Rails。
【问题讨论】：
-
请阅读“minimal reproducible example”。您的代码需要减少到最低限度以证明问题并且在问题本身而不是在链接中。您的标签/关键字不是主要关键字。如果你想让很多人看到这个问题，我建议用 Ruby 替换一个，用 Rails 替换另一个。此外，不要使用称呼（“hi”）、告别词（“thank you”）或签名。 SO 不是讨论列表，而是在线参考书。最后，“编辑”和“更新”标签是不可取的。将更改后的文本合并到问题中，就好像它最初就在那里一样。我们可以看到什么时候发生了变化。
标签： ruby-on-rails ruby activerecord sinatra puma