空闲后“PGError：没有连接到服务器”

【问题标题】："PGError: no connection to the server" after idle空闲后“PGError：没有连接到服务器”
【发布时间】：2011-01-12 23:50:28
【问题描述】：

在我的应用程序在一夜之间处于空闲状态后，当我早上尝试访问它时，我收到 500 内部服务器错误，并且日志显示“PGError: no connection to the server”。在第一次请求之后，如果我再次刷新页面，一切都很好。

我在远程服务器上运行带有 apache 2、Passenger 3.0.2、Rails 2.3.8 和 Postgres 8.4 的 Ubuntu 10.04。

任何想法如何解决这个问题？

这是日志：

Processing ApplicationController#index (for 192.168.1.33 at 2011-01-06 17:28:14) [GET]
  Parameters: {"action"=>"index", "controller"=>"da"}
ActiveRecord::StatementInvalid (PGError: no connection to the server
: SELECT * FROM "users" WHERE ("users"."id" = 1)  LIMIT 1):
  app/controllers/application_controller.rb:47:in `current_user'
  app/controllers/application_controller.rb:51:in `set_current_user'
  app/controllers/application_controller.rb:123:in `render_optional_error_file'
  passenger (3.0.2) lib/phusion_passenger/rack/request_handler.rb:96:in `process_request'
  passenger (3.0.2) lib/phusion_passenger/abstract_request_handler.rb:513:in `accept_and_process_next_request'
  passenger (3.0.2) lib/phusion_passenger/abstract_request_handler.rb:274:in `main_loop'
  passenger (3.0.2) lib/phusion_passenger/classic_rails/application_spawner.rb:321:in `start_request_handler'
  passenger (3.0.2) lib/phusion_passenger/classic_rails/application_spawner.rb:275:in `send'
  passenger (3.0.2) lib/phusion_passenger/classic_rails/application_spawner.rb:275:in `handle_spawn_application'
  passenger (3.0.2) lib/phusion_passenger/utils.rb:479:in `safe_fork'
  passenger (3.0.2) lib/phusion_passenger/classic_rails/application_spawner.rb:270:in `handle_spawn_application'
  passenger (3.0.2) lib/phusion_passenger/abstract_server.rb:357:in `__send__'
  passenger (3.0.2) lib/phusion_passenger/abstract_server.rb:357:in `server_main_loop'
  passenger (3.0.2) lib/phusion_passenger/abstract_server.rb:206:in `start_synchronously'
  passenger (3.0.2) lib/phusion_passenger/abstract_server.rb:180:in `start'
  passenger (3.0.2) lib/phusion_passenger/classic_rails/application_spawner.rb:149:in `start'
  passenger (3.0.2) lib/phusion_passenger/spawn_manager.rb:219:in `spawn_rails_application'
  passenger (3.0.2) lib/phusion_passenger/abstract_server_collection.rb:132:in `lookup_or_add'
  passenger (3.0.2) lib/phusion_passenger/spawn_manager.rb:214:in `spawn_rails_application'
  passenger (3.0.2) lib/phusion_passenger/abstract_server_collection.rb:82:in `synchronize'
  passenger (3.0.2) lib/phusion_passenger/abstract_server_collection.rb:79:in `synchronize'
  passenger (3.0.2) lib/phusion_passenger/spawn_manager.rb:213:in `spawn_rails_application'
  passenger (3.0.2) lib/phusion_passenger/spawn_manager.rb:132:in `spawn_application'
  passenger (3.0.2) lib/phusion_passenger/spawn_manager.rb:275:in `handle_spawn_application'
  passenger (3.0.2) lib/phusion_passenger/abstract_server.rb:357:in `__send__'
  passenger (3.0.2) lib/phusion_passenger/abstract_server.rb:357:in `server_main_loop'
  passenger (3.0.2) lib/phusion_passenger/abstract_server.rb:206:in `start_synchronously'
  passenger (3.0.2) helper-scripts/passenger-spawn-server:99
/!\ FAILSAFE /!\  Thu Jan 06 17:28:14 -0700 2011
  Status: 500 Internal Server Error
  PGError: no connection to the server
: SELECT * FROM "users" WHERE ("users"."id" = 1)  LIMIT 1
    /var/lib/gems/1.8/gems/activerecord-2.3.8/lib/active_record/connection_adapters/abstract_adapter.rb:221:in `log'
    /var/lib/gems/1.8/gems/activerecord-2.3.8/lib/active_record/connection_adapters/postgresql_adapter.rb:520:in `execute'
    /var/lib/gems/1.8/gems/activerecord-2.3.8/lib/active_record/connection_adapters/postgresql_adapter.rb:1002:in `select_raw'
    /var/lib/gems/1.8/gems/activerecord-2.3.8/lib/active_record/connection_adapters/postgresql_adapter.rb:989:in `select'
    /var/lib/gems/1.8/gems/activerecord-2.3.8/lib/active_record/connection_adapters/abstract/database_statements.rb:7:in `select_all_without_query_cache'
    /var/lib/gems/1.8/gems/activerecord-2.3.8/lib/active_record/connection_adapters/abstract/query_cache.rb:60:in `select_all'
    /var/lib/gems/1.8/gems/activerecord-2.3.8/lib/active_record/connection_adapters/abstract/query_cache.rb:81:in `cache_sql'
    /var/lib/gems/1.8/gems/activerecord-2.3.8/lib/active_record/connection_adapters/abstract/query_cache.rb:60:in `select_all'
    /var/lib/gems/1.8/gems/activerecord-2.3.8/lib/active_record/base.rb:664:in `find_by_sql'
    /var/lib/gems/1.8/gems/activerecord-2.3.8/lib/active_record/base.rb:1578:in `find_every'
    /var/lib/gems/1.8/gems/activerecord-2.3.8/lib/active_record/base.rb:1535:in `find_initial'
    /var/lib/gems/1.8/gems/activerecord-2.3.8/lib/active_record/base.rb:616:in `find'
    /var/lib/gems/1.8/gems/activerecord-2.3.8/lib/active_record/base.rb:1910:in `find_by_id'
    /home/user/application/releases/20110106230903/app/controllers/application_controller.rb:47:in `current_user'
    /home/user/application/releases/20110106230903/app/controllers/application_controller.rb:51:in `set_current_user'
    /home/user/application/releases/20110106230903/app/controllers/application_controller.rb:123:in `render_optional_error_file'
    /var/lib/gems/1.8/gems/actionpack-2.3.8/lib/action_controller/rescue.rb:97:in `rescue_action_in_public'
    /home/user/application/releases/20110106230903/vendor/plugins/exception_notification/lib/exception_notification/notifiable.rb:48:in `rescue_action_in_public'
    /var/lib/gems/1.8/gems/actionpack-2.3.8/lib/action_controller/rescue.rb:154:in `rescue_action_without_handler'
    /var/lib/gems/1.8/gems/actionpack-2.3.8/lib/action_controller/rescue.rb:74:in `rescue_action'
    /var/lib/gems/1.8/gems/actionpack-2.3.8/lib/action_controller/base.rb:532:in `send'
    /var/lib/gems/1.8/gems/actionpack-2.3.8/lib/action_controller/base.rb:532:in `process_without_filters'
    /var/lib/gems/1.8/gems/actionpack-2.3.8/lib/action_controller/filters.rb:606:in `process'
    /var/lib/gems/1.8/gems/actionpack-2.3.8/lib/action_controller/rescue.rb:65:in `call_with_exception'
    /var/lib/gems/1.8/gems/actionpack-2.3.8/lib/action_controller/dispatcher.rb:90:in `dispatch'
    /var/lib/gems/1.8/gems/actionpack-2.3.8/lib/action_controller/dispatcher.rb:121:in `_call'
    /var/lib/gems/1.8/gems/actionpack-2.3.8/lib/action_controller/dispatcher.rb:130
    /var/lib/gems/1.8/gems/activerecord-2.3.8/lib/active_record/query_cache.rb:29:in `call'
    /var/lib/gems/1.8/gems/activerecord-2.3.8/lib/active_record/query_cache.rb:29:in `call'
    /var/lib/gems/1.8/gems/activerecord-2.3.8/lib/active_record/connection_adapters/abstract/query_cache.rb:34:in `cache'
    /var/lib/gems/1.8/gems/activerecord-2.3.8/lib/active_record/query_cache.rb:9:in `cache'
    /var/lib/gems/1.8/gems/activerecord-2.3.8/lib/active_record/query_cache.rb:28:in `call'
    /var/lib/gems/1.8/gems/activerecord-2.3.8/lib/active_record/connection_adapters/abstract/connection_pool.rb:361:in `call'
    /var/lib/gems/1.8/gems/actionpack-2.3.8/lib/action_controller/string_coercion.rb:25:in `call'
    /var/lib/gems/1.8/gems/rack-1.1.0/lib/rack/head.rb:9:in `call'
    /var/lib/gems/1.8/gems/rack-1.1.0/lib/rack/methodoverride.rb:24:in `call'
    /var/lib/gems/1.8/gems/actionpack-2.3.8/lib/action_controller/params_parser.rb:15:in `call'
    /var/lib/gems/1.8/gems/actionpack-2.3.8/lib/action_controller/session/cookie_store.rb:99:in `call'
    /var/lib/gems/1.8/gems/actionpack-2.3.8/lib/action_controller/failsafe.rb:26:in `call'
    /var/lib/gems/1.8/gems/rack-1.1.0/lib/rack/lock.rb:11:in `call'
    /var/lib/gems/1.8/gems/rack-1.1.0/lib/rack/lock.rb:11:in `synchronize'
    /var/lib/gems/1.8/gems/rack-1.1.0/lib/rack/lock.rb:11:in `call'
    /var/lib/gems/1.8/gems/actionpack-2.3.8/lib/action_controller/dispatcher.rb:106:in `call'
    /var/lib/gems/1.8/gems/passenger-3.0.2/lib/phusion_passenger/rack/request_handler.rb:96:in `process_request'
    /var/lib/gems/1.8/gems/passenger-3.0.2/lib/phusion_passenger/abstract_request_handler.rb:513:in `accept_and_process_next_request'
    /var/lib/gems/1.8/gems/passenger-3.0.2/lib/phusion_passenger/abstract_request_handler.rb:274:in `main_loop'
    /var/lib/gems/1.8/gems/passenger-3.0.2/lib/phusion_passenger/classic_rails/application_spawner.rb:321:in `start_request_handler'
    /var/lib/gems/1.8/gems/passenger-3.0.2/lib/phusion_passenger/classic_rails/application_spawner.rb:275:in `send'
    /var/lib/gems/1.8/gems/passenger-3.0.2/lib/phusion_passenger/classic_rails/application_spawner.rb:275:in `handle_spawn_application'
    /var/lib/gems/1.8/gems/passenger-3.0.2/lib/phusion_passenger/utils.rb:479:in `safe_fork'
    /var/lib/gems/1.8/gems/passenger-3.0.2/lib/phusion_passenger/classic_rails/application_spawner.rb:270:in `handle_spawn_application'
    /var/lib/gems/1.8/gems/passenger-3.0.2/lib/phusion_passenger/abstract_server.rb:357:in `__send__'
    /var/lib/gems/1.8/gems/passenger-3.0.2/lib/phusion_passenger/abstract_server.rb:357:in `server_main_loop'
    /var/lib/gems/1.8/gems/passenger-3.0.2/lib/phusion_passenger/abstract_server.rb:206:in `start_synchronously'
    /var/lib/gems/1.8/gems/passenger-3.0.2/lib/phusion_passenger/abstract_server.rb:180:in `start'
    /var/lib/gems/1.8/gems/passenger-3.0.2/lib/phusion_passenger/classic_rails/application_spawner.rb:149:in `start'
    /var/lib/gems/1.8/gems/passenger-3.0.2/lib/phusion_passenger/spawn_manager.rb:219:in `spawn_rails_application'
    /var/lib/gems/1.8/gems/passenger-3.0.2/lib/phusion_passenger/abstract_server_collection.rb:132:in `lookup_or_add'
    /var/lib/gems/1.8/gems/passenger-3.0.2/lib/phusion_passenger/spawn_manager.rb:214:in `spawn_rails_application'
    /var/lib/gems/1.8/gems/passenger-3.0.2/lib/phusion_passenger/abstract_server_collection.rb:82:in `synchronize'
    /var/lib/gems/1.8/gems/passenger-3.0.2/lib/phusion_passenger/abstract_server_collection.rb:79:in `synchronize'
    /var/lib/gems/1.8/gems/passenger-3.0.2/lib/phusion_passenger/spawn_manager.rb:213:in `spawn_rails_application'
    /var/lib/gems/1.8/gems/passenger-3.0.2/lib/phusion_passenger/spawn_manager.rb:132:in `spawn_application'
    /var/lib/gems/1.8/gems/passenger-3.0.2/lib/phusion_passenger/spawn_manager.rb:275:in `handle_spawn_application'
    /var/lib/gems/1.8/gems/passenger-3.0.2/lib/phusion_passenger/abstract_server.rb:357:in `__send__'
    /var/lib/gems/1.8/gems/passenger-3.0.2/lib/phusion_passenger/abstract_server.rb:357:in `server_main_loop'
    /var/lib/gems/1.8/gems/passenger-3.0.2/lib/phusion_passenger/abstract_server.rb:206:in `start_synchronously'
    /var/lib/gems/1.8/gems/passenger-3.0.2/helper-scripts/passenger-spawn-server:99

【问题讨论】：

  • 我真的想通了，我应该早点回答：在 Ubuntu 中，tcp_keepalive_time 的默认值（在 TCP 开始发送 keep-alive 探测之前连接需要空闲的秒数。）是2小时。我的开关设置为 15 分钟后超时空闲连接。我只是将我的开关设置为使端口 5432 上的空闲连接保持活动状态超过 2 小时，我的问题就解决了。基本错误。

标签： ruby-on-rails apache postgresql


【解决方案1】：

在研究我自己版本的这个问题时遇到了这个问题。看起来您正在使用 spawn 库中的 fork 方法（可能是 Phusion Passenger 的一部分？），目前似乎与 Postgres 不兼容。

我希望这能为您和/或下一位访客提供可能的线索。

【讨论】：

  • 您有更多相关信息吗？这是 Postgres、Rails、Ruby、Passenger 中的一个分支，还是什么？如何禁用它？
【解决方案2】：

尝试通过将此行添加到您的 database.yml 文件来关闭 SSL 数据库连接：

sslmode: disable

【讨论】：

  • 谢谢你的回答，我会试试这个，但是你有更多的信息吗？我认为问题是 SSL 连接超时？有没有另一种方法来处理这个并且仍然使用 SSL？我在这里处理敏感数据，我希望尽可能保持连接安全。
  • 很抱歉，这不起作用。不过感谢您的尝试。还有其他想法吗？
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