Rails，Nginx和PostgreSQL - 502网关错误

我在Linode上运行Ubuntu 11.04，我试图获得Rails 3.1，Nginx 1.0.6，Passenger 3.0.9和PostgreSQL 8.4的设置和运行。我设法部署了我的应用程序，并且它看起来都很完美，但是在几次成功的HTTP请求之后，服务器开始返回502网关错误。我使用了相同的设置在我的OS X开发机器上（PostgreSQL 8.4，Rails 3.1和WEBrick），它的工作原理非常完美。我在Nginx日志中看到了它，它似乎是PostgreSQL问题。Rails，Nginx和PostgreSQL - 502网关错误

有谁知道这个问题可能是什么？

2011/09/26 11:43:41 [error] 19694#0: *152 upstream prematurely closed connection while reading response header from upstream, client: <REDACTED>, server: localhost, request: "GET /news/new HTTP/1.0", upstream: "passenger:unix:/passenger_helper_server:", host: "<REDACTED>" 
[ pid=19978 thr=-609427238 file=utils.rb:176 time=2011-09-26 11:43:41.504 ]: *** Exception PGError in application (server closed the connection unexpectedly 
     This probably means the server terminated abnormally 
     before or while processing the request.** 
) (process 19978, thread #<Thread:0xb759c1b4>): 
     from /var/lib/gems/1.8/gems/activerecord-3.1.0/lib/active_record/connection_adapters/postgresql_adapter.rb:276:in `query' 
     from /var/lib/gems/1.8/gems/activerecord-3.1.0/lib/active_record/connection_adapters/postgresql_adapter.rb:276:in `clear_cache!' 
     from /var/lib/gems/1.8/gems/activerecord-3.1.0/lib/active_record/connection_adapters/postgresql_adapter.rb:275:in `each_value' 
     from /var/lib/gems/1.8/gems/activerecord-3.1.0/lib/active_record/connection_adapters/postgresql_adapter.rb:275:in `clear_cache!' 
     from /var/lib/gems/1.8/gems/activerecord-3.1.0/lib/active_record/connection_adapters/postgresql_adapter.rb:303:in `disconnect!' 
     from /var/lib/gems/1.8/gems/activerecord-3.1.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:202:in `disconnect_without_synchronization!' 
     from /var/lib/gems/1.8/gems/activerecord-3.1.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:201:in `each' 
     from /var/lib/gems/1.8/gems/activerecord-3.1.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:201:in `disconnect_without_synchronization!' 
     from /var/lib/gems/1.8/gems/activesupport-3.1.0/lib/active_support/core_ext/module/synchronization.rb:35:in `disconnect!' 
     from /usr/lib/ruby/1.8/monitor.rb:242:in `synchronize' 
     from /var/lib/gems/1.8/gems/activesupport-3.1.0/lib/active_support/core_ext/module/synchronization.rb:34:in `disconnect!' 
     from /var/lib/gems/1.8/gems/activerecord-3.1.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:395:in `clear_all_connections!' 
     from /var/lib/gems/1.8/gems/activerecord-3.1.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:395:in `each_value' 
     from /var/lib/gems/1.8/gems/activerecord-3.1.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:395:in `clear_all_connections!' 
     from /var/lib/gems/1.8/gems/activerecord-3.1.0/lib/active_record/connection_adapters/abstract/connection_specification.rb:123:in `__send__' 
     from /var/lib/gems/1.8/gems/activerecord-3.1.0/lib/active_record/connection_adapters/abstract/connection_specification.rb:123:in `clear_all_connections!' 
     from /opt/passenger-3.0.9/lib/phusion_passenger/utils.rb:398:in `before_handling_requests' 
     from /opt/passenger-3.0.9/lib/phusion_passenger/rack/application_spawner.rb:204:in `start_request_handler' 
     from /opt/passenger-3.0.9/lib/phusion_passenger/rack/application_spawner.rb:170:in `send' 
     from /opt/passenger-3.0.9/lib/phusion_passenger/rack/application_spawner.rb:170:in `handle_spawn_application' 
     from /opt/passenger-3.0.9/lib/phusion_passenger/utils.rb:479:in `safe_fork' 
     from /opt/passenger-3.0.9/lib/phusion_passenger/rack/application_spawner.rb:165:in `handle_spawn_application' 
     from /opt/passenger-3.0.9/lib/phusion_passenger/abstract_server.rb:357:in `__send__' 
     from /opt/passenger-3.0.9/lib/phusion_passenger/abstract_server.rb:357:in `server_main_loop' 
     from /opt/passenger-3.0.9/lib/phusion_passenger/abstract_server.rb:206:in `start_synchronously' 
     from /opt/passenger-3.0.9/lib/phusion_passenger/abstract_server.rb:180:in `start' 
     from /opt/passenger-3.0.9/lib/phusion_passenger/rack/application_spawner.rb:128:in `start' 
     from /opt/passenger-3.0.9/lib/phusion_passenger/spawn_manager.rb:253:in `spawn_rack_application' 
     from /opt/passenger-3.0.9/lib/phusion_passenger/abstract_server_collection.rb:132:in `lookup_or_add' 
     from /opt/passenger-3.0.9/lib/phusion_passenger/spawn_manager.rb:246:in `spawn_rack_application' 
     from /opt/passenger-3.0.9/lib/phusion_passenger/abstract_server_collection.rb:82:in `synchronize' 
     from /opt/passenger-3.0.9/lib/phusion_passenger/abstract_server_collection.rb:79:in `synchronize' 
     from /opt/passenger-3.0.9/lib/phusion_passenger/spawn_manager.rb:244:in `spawn_rack_application' 
     from /opt/passenger-3.0.9/lib/phusion_passenger/spawn_manager.rb:137:in `spawn_application' 
     from /opt/passenger-3.0.9/lib/phusion_passenger/spawn_manager.rb:275:in `handle_spawn_application' 
     from /opt/passenger-3.0.9/lib/phusion_passenger/abstract_server.rb:357:in `__send__' 
     from /opt/passenger-3.0.9/lib/phusion_passenger/abstract_server.rb:357:in `server_main_loop' 
     from /opt/passenger-3.0.9/lib/phusion_passenger/abstract_server.rb:206:in `start_synchronously' 
     from /opt/passenger-3.0.9/helper-scripts/passenger-spawn-server:99 

----------

谢谢！

来源

2011-09-26 rsl

我似乎已经通过在config/environments/production.rb中更改config.action_controller.perform_caching = false来解决这个问题，但我仍然无法弄清楚为什么缓存会导致Postgres错误，并且它不是一个真正可行的选项在生产模式下关闭缓存。 – rsl

在这种情况下写入日志PostgreSQL的是什么？必须有一些理由来关闭连接 - 可能是旧版本的PostgreSQL？

来源

2011-09-26 12:41:22

我检查了日志，我能看到的唯一错误是： 2011-09-25 16:43:50 BST日志：不完整的启动数据包 2011-09-25 18:31:53 BST LOG：意外的EOF在客户端连接 2011-09-26 11:39:10 BST日志：客户端连接上意外的EOF 2011-09-26 11:39:26 BST日志：客户端连接上意外的EOF 2011-09-26 13:00 ：42 BST日志：不完整的启动数据包。我不完全确定为什么数据库客户端例如在这种情况下，Rails不会发送完整的数据流，这可能与Nginx的超时设置有关吗？ – rsl

对不起太迟了......你有哪个版本的Postgresql，哪个版本是Postgresql客户端库？ –

Rails，Nginx和PostgreSQL - 502网关错误

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