У меня последняя версия Nginx, работающая с Passenger, SQLite и Rails 3.1. Почему-то, когда у меня некоторое время работает Passenger, я получаю сообщение об ошибке «502 bad gateway» при посещении моего сайта.
Вот фрагмент из моего журнала ошибок Nginx:
2011/06/27 08:55:33 [error] 20331#0: *11270 upstream prematurely closed connection while reading response header from upstream, client: xxx.xxx.xx.x, server: www.example.com, request: "GET / HTTP/1.1", upstream: "passenger:unix:/passenger_helper_server:", host: "example.com"
2011/06/27 08:55:47 [info] 20331#0: *11273 client closed prematurely connection, so upstream connection is closed too while sending request to upstream, client: xxx.xxx.xx.x, server: www.example.com, request: "GET / HTTP/1.1", upstream: "passenger:unix:/passenger_helper_server:", host: "example.com"
Вот мой passenger-status --show=backtraces
вывод:
Thread 'Client thread 7':
in 'Passenger::FileDescriptor Client::acceptConnection()' (HelperAgent.cpp:160)
in 'void Client::threadMain()' (HelperAgent.cpp:603)
Thread 'Client thread 10':
in 'Passenger::FileDescriptor Client::acceptConnection()' (HelperAgent.cpp:160)
in 'void Client::threadMain()' (HelperAgent.cpp:603)
Thread 'Client thread 11':
in 'Passenger::FileDescriptor Client::acceptConnection()' (HelperAgent.cpp:160)
in 'void Client::threadMain()' (HelperAgent.cpp:603)
Thread 'Client thread 12':
in 'Passenger::FileDescriptor Client::acceptConnection()' (HelperAgent.cpp:160)
in 'void Client::threadMain()' (HelperAgent.cpp:603)
Thread 'Client thread 13':
in 'Passenger::FileDescriptor Client::acceptConnection()' (HelperAgent.cpp:160)
in 'void Client::threadMain()' (HelperAgent.cpp:603)
Thread 'Client thread 14':
in 'Passenger::FileDescriptor Client::acceptConnection()' (HelperAgent.cpp:160)
in 'void Client::threadMain()' (HelperAgent.cpp:603)
Thread 'Client thread 15':
in 'Passenger::FileDescriptor Client::acceptConnection()' (HelperAgent.cpp:160)
in 'void Client::threadMain()' (HelperAgent.cpp:603)
Thread 'Client thread 16':
in 'Passenger::FileDescriptor Client::acceptConnection()' (HelperAgent.cpp:160)
in 'void Client::threadMain()' (HelperAgent.cpp:603)
Thread 'Client thread 17':
in 'Passenger::FileDescriptor Client::acceptConnection()' (HelperAgent.cpp:160)
in 'void Client::threadMain()' (HelperAgent.cpp:603)
Thread 'Client thread 18':
in 'Passenger::FileDescriptor Client::acceptConnection()' (HelperAgent.cpp:160)
in 'void Client::threadMain()' (HelperAgent.cpp:603)
Thread 'Client thread 19':
in 'Passenger::FileDescriptor Client::acceptConnection()' (HelperAgent.cpp:160)
in 'void Client::threadMain()' (HelperAgent.cpp:603)
Thread 'Client thread 20':
in 'Passenger::FileDescriptor Client::acceptConnection()' (HelperAgent.cpp:160)
in 'void Client::threadMain()' (HelperAgent.cpp:603)
Thread 'Client thread 21':
in 'Passenger::FileDescriptor Client::acceptConnection()' (HelperAgent.cpp:160)
in 'void Client::threadMain()' (HelperAgent.cpp:603)
Thread 'Client thread 22':
in 'Passenger::FileDescriptor Client::acceptConnection()' (HelperAgent.cpp:160)
in 'void Client::threadMain()' (HelperAgent.cpp:603)
Thread 'Client thread 23':
in 'Passenger::FileDescriptor Client::acceptConnection()' (HelperAgent.cpp:160)
in 'void Client::threadMain()' (HelperAgent.cpp:603)
Thread 'Client thread 24':
in 'Passenger::FileDescriptor Client::acceptConnection()' (HelperAgent.cpp:160)
in 'void Client::threadMain()' (HelperAgent.cpp:603)
Thread 'MessageServer thread':
in 'void Passenger::MessageServer::mainLoop()' (MessageServer.h:537)
Thread 'MessageServer client thread 35':
in 'virtual bool Passenger::BacktracesServer::processMessage(Passenger::MessageServer::CommonClientContext&, boost::shared_ptr<Passenger::MessageServer::ClientContext>&, const std::vector<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::basic_string<char, std::char_traits<char>, std::allocator<char> > > >&)' (BacktracesServer.h:47)
in 'void Passenger::MessageServer::clientHandlingMainLoop(Passenger::FileDescriptor&)' (MessageServer.h:470)
Это то, что показывает мой passenger-memory-stats
---------- Nginx processes ----------
PID PPID VMSize Private Name
-------------------------------------
16291 1 35.4 MB 0.1 MB nginx: master process /home/apps/.nginx/sbin/nginx
16292 16291 36.0 MB 0.8 MB nginx: worker process
16293 16291 35.8 MB 0.5 MB nginx: worker process
16294 16291 35.8 MB 0.5 MB nginx: worker process
16295 16291 35.8 MB 0.5 MB nginx: worker process
### Processes: 5
### Total private dirty RSS: 2.46 MB
----- Passenger processes ------
PID VMSize Private Name
--------------------------------
16251 87.0 MB 0.3 MB PassengerWatchdog
16254 100.4 MB 1.3 MB PassengerHelperAgent
16256 41.6 MB 5.7 MB Passenger spawn server
16259 134.8 MB 0.8 MB PassengerLoggingAgent
18390 770.4 MB 17.1 MB Passenger ApplicationSpawner: /home/apps/manager/current
18415 853.3 MB 147.7 MB Rack: /home/apps/manager/current
18424 790.5 MB 57.2 MB Rack: /home/apps/manager/current
18431 774.7 MB 18.7 MB Rack: /home/apps/manager/current
### Processes: 8
### Total private dirty RSS: 248.85 MB
Кажется, есть проблема с моей связью между Пассажиром и Nginx?
Кроме того, при просмотре журналов Rails становится ясно, что запрос вообще не достигает Rails, поскольку в журналах нет записей о посещениях, которые получают ошибку 502. Поэтому моя первоначальная мысль о том, что что-то не так с любым промежуточным программным обеспечением Rack, не должна быть возможной.