拥有一个rails API应用程序，托管在具有phusion passenger和nginx的云上。如果API在一段时间内未被访问，则对API的请求将超时。
检查日志，似乎请求成功点击了rails，这就是它超时的地方。
这是rails log
PG::UnableToSend (server closed the connection unexpectedly
This probably means the server terminated abnormally
before or while processing the request.
activerecord (4.2.5.1) lib/active_record/connection_adapters/postgresql_adapter.rb:215:in `exec'
activerecord (4.2.5.1) lib/active_record/connection_adapters/postgresql_adapter.rb:215:in `dealloc'
activerecord (4.2.5.1) lib/active_record/connection_adapters/postgresql_adapter.rb:198:in `block in clear'
activerecord (4.2.5.1) lib/active_record/connection_adapters/postgresql_adapter.rb:197:in `each_value'
activerecord (4.2.5.1) lib/active_record/connection_adapters/postgresql_adapter.rb:197:in `clear'
activerecord (4.2.5.1) lib/active_record/connection_adapters/postgresql_adapter.rb:258:in `clear_cache!'
activerecord (4.2.5.1) lib/active_record/connection_adapters/abstract_adapter.rb:291:in `reconnect!'
activerecord (4.2.5.1) lib/active_record/connection_adapters/postgresql_adapter.rb:275:in `reconnect!'
activerecord (4.2.5.1) lib/active_record/connection_adapters/abstract_adapter.rb:328:in `verify!'
activerecord (4.2.5.1) lib/active_record/connection_adapters/abstract/connection_pool.rb:456:in `block in checkout_and_verify'
activesupport (4.2.5.1) lib/active_support/callbacks.rb:88:in `__run_callbacks__'
activesupport (4.2.5.1) lib/active_support/callbacks.rb:778:in `_run_checkout_callbacks'
activerecord (4.2.5.1) lib/active_record/connection_adapters/abstract/connection_pool.rb:455:in `checkout_and_verify'
activerecord (4.2.5.1) lib/active_record/connection_adapters/abstract/connection_pool.rb:351:in `block in checkout'
/usr/local/lib/ruby/2.3.0/monitor.rb:214:in `mon_synchronize'
activerecord (4.2.5.1) lib/active_record/connection_adapters/abstract/connection_pool.rb:348:in `checkout'
activerecord (4.2.5.1) lib/active_record/connection_adapters/abstract/connection_pool.rb:263:in `block in connection'
/usr/local/lib/ruby/2.3.0/monitor.rb:214:in `mon_synchronize'
activerecord (4.2.5.1) lib/active_record/connection_adapters/abstract/connection_pool.rb:262:in `connection'
activerecord (4.2.5.1) lib/active_record/connection_adapters/abstract/connection_pool.rb:571:in `retrieve_connection'
activerecord (4.2.5.1) lib/active_record/connection_handling.rb:113:in `retrieve_connection'
activerecord (4.2.5.1) lib/active_record/connection_handling.rb:87:in `connection'
activerecord (4.2.5.1) lib/active_record/query_cache.rb:31:in `call'
newrelic_rpm (3.15.1.316) lib/new_relic/agent/instrumentation/middleware_tracing.rb:96:in `call'
activerecord (4.2.5.1) lib/active_record/connection_adapters/abstract/connection_pool.rb:653:in `call'
newrelic_rpm (3.15.1.316) lib/new_relic/agent/instrumentation/middleware_tracing.rb:96:in `call'
actionpack (4.2.5.1) lib/action_dispatch/middleware/callbacks.rb:29:in `block in call'
activesupport (4.2.5.1) lib/active_support/callbacks.rb:88:in `__run_callbacks__'
activesupport (4.2.5.1) lib/active_support/callbacks.rb:778:in `_run_call_callbacks'
activesupport (4.2.5.1) lib/active_support/callbacks.rb:81:in `run_callbacks'
actionpack (4.2.5.1) lib/action_dispatch/middleware/callbacks.rb:27:in `call'
newrelic_rpm (3.15.1.316) lib/new_relic/agent/instrumentation/middleware_tracing.rb:96:in `call'
actionpack (4.2.5.1) lib/action_dispatch/middleware/remote_ip.rb:78:in `call'
newrelic_rpm (3.15.1.316) lib/new_relic/agent/instrumentation/middleware_tracing.rb:96:in `call'
airbrake (5.2.3) lib/airbrake/rack/middleware.rb:22:in `call'
newrelic_rpm (3.15.1.316) lib/new_relic/agent/instrumentation/middleware_tracing.rb:96:in `call'
actionpack (4.2.5.1) lib/action_dispatch/middleware/debug_exceptions.rb:17:in `call'
newrelic_rpm (3.15.1.316) lib/new_relic/agent/instrumentation/middleware_tracing.rb:96:in `call'
actionpack (4.2.5.1) lib/action_dispatch/middleware/show_exceptions.rb:30:in `call'
newrelic_rpm (3.15.1.316) lib/new_relic/agent/instrumentation/middleware_tracing.rb:96:in `call'
railties (4.2.5.1) lib/rails/rack/logger.rb:38:in `call_app'
railties (4.2.5.1) lib/rails/rack/logger.rb:20:in `block in call'
activesupport (4.2.5.1) lib/active_support/tagged_logging.rb:68:in `block in tagged'
activesupport (4.2.5.1) lib/active_support/tagged_logging.rb:26:in `tagged'
activesupport (4.2.5.1) lib/active_support/tagged_logging.rb:68:in `tagged'
railties (4.2.5.1) lib/rails/rack/logger.rb:20:in `call'
newrelic_rpm (3.15.1.316) lib/new_relic/agent/instrumentation/middleware_tracing.rb:96:in `call'
actionpack (4.2.5.1) lib/action_dispatch/middleware/request_id.rb:21:in `call'
newrelic_rpm (3.15.1.316) lib/new_relic/agent/instrumentation/middleware_tracing.rb:96:in `call'
rack (1.6.4) lib/rack/runtime.rb:18:in `call'
newrelic_rpm (3.15.1.316) lib/new_relic/agent/instrumentation/middleware_tracing.rb:96:in `call'
activesupport (4.2.5.1) lib/active_support/cache/strategy/local_cache_middleware.rb:28:in `call'
newrelic_rpm (3.15.1.316) lib/new_relic/agent/instrumentation/middleware_tracing.rb:96:in `call'
railties (4.2.5.1) lib/rails/engine.rb:518:in `call'
railties (4.2.5.1) lib/rails/application.rb:165:in `call'
newrelic_rpm (3.15.1.316) lib/new_relic/agent/instrumentation/middleware_tracing.rb:96:in `call'
/usr/share/ruby/vendor_ruby/phusion_passenger/rack/thread_handler_extension.rb:97:in `process_request'
/usr/share/ruby/vendor_ruby/phusion_passenger/request_handler/thread_handler.rb:152:in `accept_and_process_next_request'
/usr/share/ruby/vendor_ruby/phusion_passenger/request_handler/thread_handler.rb:113:in `main_loop'
/usr/share/ruby/vendor_ruby/phusion_passenger/request_handler.rb:416:in `block (3 levels) in start_threads'
/usr/share/ruby/vendor_ruby/phusion_passenger/utils.rb:113:in `block in create_thread_and_abort_on_exception'
database.yml配置
database: xxx
username: xxx
password: xxx
host: xxx
port: 5432
pool: 10
乘客配置
server {
listen 80 default_server;
server_name {{server_name}};
passenger_enabled on;
rails_env {{env}};
root {{rails_app_root}}/{{rails_app_package_name}}-{{node_env}}/public;
passenger_min_instances 3;
}
passenger_max_request_queue_size 500;
passenger_pre_start http://{{server_name}}{{pre_start_url}};
passenger_spawn_method direct;
passenger_pool_idle_time 0;
passenger_max_preloader_idle_time 0;
关于为什么会发生这种情况的任何指示？ 这种情况不会始终发生，只有在服务闲置一段时间后才能访问该服务。