我有一个生产网站使用数据库从亚马逊服务器，我有两个网站在同一台服务器上，他们都连接没有问题。
在这个特定的网站上，到mysql的连接不起作用，我以为env文件丢失或没有被laravel应用程序看到，但事实并非如此，当我运行php artisan tinker并尝试任何命令时，它工作：

DB::table('categories')->get();
=> Illuminate\Support\Collection {#842
     all: [
       {#828
         +"id": 1,
         +"parent_id": null,
         +"order": 1,
         +"name": "Noticias",
         +"slug": "noticias",
         +"created_at": "2018-01-09 19:26:32",
         +"updated_at": "2018-01-09 19:26:32",
       },
     ],
   }

App：：environment（）方法也可以工作：

>>> App::environment();
=> "production"

env文件清楚地显示为APP_DEBUG=false，但它返回了大量的调试，就像web服务器没有阅读env文件一样。
这让我抓狂，因为它自己开始失败，服务器或代码上没有任何变化，这是唯一失败的项目。
我还能检查什么？

[2018-08-25 12:22:04] production.ERROR: SQLSTATE[HY000] [2002] Connection refused {"exception":"[object] (PDOException(code: 2002): SQLSTATE[HY000] [2002] Connection refused at /var/app/html/releases/20180824022105/vendor/laravel/framework/src/Illuminate/Database/Connectors/Connector.php:67)
[stacktrace]
#0 /var/app/html/releases/20180824022105/vendor/laravel/framework/src/Illuminate/Database/Connectors/Connector.php(67): PDO->__construct('mysql:host=127....', 'root', 'C4f2469dcF!', Array)
#1 /var/app/html/releases/20180824022105/vendor/laravel/framework/src/Illuminate/Database/Connectors/Connector.php(43): Illuminate\\Database\\Connectors\\Connector->createPdoConnection('mysql:host=127....', 'root', 'C4f2469dcF!', Array)
#2 /var/app/html/releases/20180824022105/vendor/laravel/framework/src/Illuminate/Database/Connectors/MySqlConnector.php(24): Illuminate\\Database\\Connectors\\Connector->createConnection('mysql:host=127....', Array, Array)
#3 /var/app/html/releases/20180824022105/vendor/laravel/framework/src/Illuminate/Database/Connectors/ConnectionFactory.php(183): Illuminate\\Database\\Connectors\\MySqlConnector->connect(Array)
#4 [internal function]: Illuminate\\Database\\Connectors\\ConnectionFactory->Illuminate\\Database\\Connectors\\{closure}()
#5 /var/app/html/releases/20180824022105/vendor/laravel/framework/src/Illuminate/Database/Connection.php(915): call_user_func(Object(Closure))
#6 /var/app/html/releases/20180824022105/vendor/laravel/framework/src/Illuminate/Database/Connection.php(940): Illuminate\\Database\\Connection->getPdo()
#7 /var/app/html/releases/20180824022105/vendor/laravel/framework/src/Illuminate/Database/Connection.php(399): Illuminate\\Database\\Connection->getReadPdo()
#8 /var/app/html/releases/20180824022105/vendor/laravel/framework/src/Illuminate/Database/Connection.php(325): Illuminate\\Database\\Connection->getPdoForSelect(true)
#9 /var/app/html/releases/20180824022105/vendor/laravel/framework/src/Illuminate/Database/Connection.php(657): Illuminate\\Database\\Connection->Illuminate\\Database\\{closure}('select * from `...', Array)
#10 /var/app/html/releases/20180824022105/vendor/laravel/framework/src/Illuminate/Database/Connection.php(624): Illuminate\\Database\\Connection->runQueryCallback('select * from `...', Array, Object(Closure))
#11 /var/app/html/releases/20180824022105/vendor/laravel/framework/src/Illuminate/Database/Connection.php(333): Illuminate\\Database\\Connection->run('select * from
`...', Array, Object(Closure))
#12 /var/app/html/releases/20180824022105/vendor/laravel/framework/src/Illuminate/Database/Query/Builder.php(1719): Illuminate\\Database\\Connection->select('select
* from `...', Array, true)
#13 /var/app/html/releases/20180824022105/vendor/laravel/framework/src/Illuminate/Database/Query/Builder.php(1704): Illuminate\\Database\\Query\\Builder->runSelect()
#14 /var/app/html/releases/20180824022105/vendor/laravel/framework/src/Illuminate/Database/Eloquent/Builder.php(483): Illuminate\\Database\\Query\\Builder->get(Array)
#15 /var/app/html/releases/20180824022105/vendor/laravel/framework/src/Illuminate/Database/Eloquent/Builder.php(467): Illuminate\\Database\\Eloquent\\Builder->getModels(Array)
#16 /var/app/html/releases/20180824022105/vendor/laravel/framework/src/Illuminate/Database/Eloquent/Model.php(360): Illuminate\\Database\\Eloquent\\Builder->get(Array)
#17 /var/app/html/releases/20180824022105/app/Category.php(13): Illuminate\\Database\\Eloquent\\Model::all()
#18 /var/app/html/releases/20180824022105/vendor/laravel/framework/src/Illuminate/Cache/Repository.php(327): App\\Category::App\\{closure}()
#19 /var/app/html/releases/20180824022105/vendor/laravel/framework/src/Illuminate/Cache/CacheManager.php(304): Illuminate\\Cache\\Repository->remember('list-categories', NULL, Object(Closure))
#20 /var/app/html/releases/20180824022105/vendor/laravel/framework/src/Illuminate/Support/Facades/Facade.php(221): Illuminate\\Cache\\CacheManager->__call('remember', Array)
#21 /var/app/html/releases/20180824022105/app/Category.php(20): Illuminate\\Support\\Facades\\Facade::__callStatic('remember', Array)
#22 /var/app/html/releases/20180824022105/routes/web.php(150): App\\Category::getCategories()
#23 /var/app/html/releases/20180824022105/vendor/laravel/framework/src/Illuminate/Routing/Router.php(389): Illuminate\\Routing\\Router->{closure}(Object(Illuminate\\Routing\\Router))
#24 /var/app/html/releases/20180824022105/vendor/laravel/framework/src/Illuminate/Routing/Router.php(349): Illuminate\\Routing\\Router->loadRoutes(Object(Closure))
#25 /var/app/html/releases/20180824022105/vendor/laravel/framework/src/Illuminate/Support/Facades/Facade.php(221): Illuminate\\Routing\\Router->group(Array, Object(Closure))
#26 /var/app/html/releases/20180824022105/routes/web.php(162): Illuminate\\Support\\Facades\\Facade::__callStatic('group', Array)
#27 /var/app/html/releases/20180824022105/vendor/laravel/framework/src/Illuminate/Routing/Router.php(393): require('/var/www/turico...')
#28 /var/app/html/releases/20180824022105/vendor/laravel/framework/src/Illuminate/Routing/Router.php(349): Illuminate\\Routing\\Router->loadRoutes('/var/www/turico...')
#29 /var/app/html/releases/20180824022105/vendor/laravel/framework/src/Illuminate/Routing/RouteRegistrar.php(105): Illuminate\\Routing\\Router->group(Array, '/var/www/turico...')
#30 /var/app/html/releases/20180824022105/app/Providers/RouteServiceProvider.php(56): Illuminate\\Routing\\RouteRegistrar->group('/var/www/turico...')
#31 /var/app/html/releases/20180824022105/app/Providers/RouteServiceProvider.php(40): App\\Providers\\RouteServiceProvider->mapWebRoutes()
#32 [internal function]: App\\Providers\\RouteServiceProvider->map()
#33 /var/app/html/releases/20180824022105/vendor/laravel/framework/src/Illuminate/Container/BoundMethod.php(29): call_user_func_array(Array, Array)
#34 /var/app/html/releases/20180824022105/vendor/laravel/framework/src/Illuminate/Container/BoundMethod.php(87): Illuminate\\Container\\BoundMethod::Illuminate\\Container\\{closure}()
#35 /var/app/html/releases/20180824022105/vendor/laravel/framework/src/Illuminate/Container/BoundMethod.php(31): Illuminate\\Container\\BoundMethod::callBoundMethod(Object(Illuminate\\Foundation\\Application), Array, Object(Closure))
#36 /var/app/html/releases/20180824022105/vendor/laravel/framework/src/Illuminate/Container/Container.php(549): Illuminate\\Container\\BoundMethod::call(Object(Illuminate\\Foundation\\Application), Array, Array, NULL)
#37 /var/app/html/releases/20180824022105/vendor/laravel/framework/src/Illuminate/Foundation/Support/Providers/RouteServiceProvider.php(74): Illuminate\\Container\\Container->call(Array)
#38 /var/app/html/releases/20180824022105/vendor/laravel/framework/src/Illuminate/Foundation/Support/Providers/RouteServiceProvider.php(33): Illuminate\\Foundation\\Support\\Providers\\RouteServiceProvider->loadRoutes()
#39 /var/app/html/releases/20180824022105/app/Providers/RouteServiceProvider.php(28): Illuminate\\Foundation\\Support\\Providers\\RouteServiceProvider->boot()
#40 [internal function]: App\\Providers\\RouteServiceProvider->boot()
#41 /var/app/html/releases/20180824022105/vendor/laravel/framework/src/Illuminate/Container/BoundMethod.php(29): call_user_func_array(Array, Array)
#42 /var/app/html/releases/20180824022105/vendor/laravel/framework/src/Illuminate/Container/BoundMethod.php(87): Illuminate\\Container\\BoundMethod::Illuminate\\Container\\{closure}()
#43 /var/app/html/releases/20180824022105/vendor/laravel/framework/src/Illuminate/Container/BoundMethod.php(31): Illuminate\\Container\\BoundMethod::callBoundMethod(Object(Illuminate\\Foundation\\Application), Array, Object(Closure))
#44 /var/app/html/releases/20180824022105/vendor/laravel/framework/src/Illuminate/Container/Container.php(549): Illuminate\\Container\\BoundMethod::call(Object(Illuminate\\Foundation\\Application), Array, Array, NULL)
#45 /var/app/html/releases/20180824022105/vendor/laravel/framework/src/Illuminate/Foundation/Application.php(792): Illuminate\\Container\\Container->call(Array)
#46 /var/app/html/releases/20180824022105/vendor/laravel/framework/src/Illuminate/Foundation/Application.php(775): Illuminate\\Foundation\\Application->bootProvider(Object(App\\Providers\\RouteServiceProvider))
#47 [internal function]: Illuminate\\Foundation\\Application->Illuminate\\Foundation\\{closure}(Object(App\\Providers\\RouteServiceProvider), 26)
#48 /var/app/html/releases/20180824022105/vendor/laravel/framework/src/Illuminate/Foundation/Application.php(776): array_walk(Array, Object(Closure))
#49 /var/app/html/releases/20180824022105/vendor/laravel/framework/src/Illuminate/Foundation/Bootstrap/BootProviders.php(17): Illuminate\\Foundation\\Application->boot()
#50 /var/app/html/releases/20180824022105/vendor/laravel/framework/src/Illuminate/Foundation/Application.php(213): Illuminate\\Foundation\\Bootstrap\\BootProviders->bootstrap(Object(Illuminate\\Foundation\\Application))
#51 /var/app/html/releases/20180824022105/vendor/laravel/framework/src/Illuminate/Foundation/Http/Kernel.php(162): Illuminate\\Foundation\\Application->bootstrapWith(Array)
#52 /var/app/html/releases/20180824022105/vendor/laravel/framework/src/Illuminate/Foundation/Http/Kernel.php(146): Illuminate\\Foundation\\Http\\Kernel->bootstrap()
#53 /var/app/html/releases/20180824022105/vendor/laravel/framework/src/Illuminate/Foundation/Http/Kernel.php(116): Illuminate\\Foundation\\Http\\Kernel->sendRequestThroughRouter(Object(Illuminate\\Http\\Request))
#54 /var/app/html/releases/20180824022105/public/index.php(55): Illuminate\\Foundation\\Http\\Kernel->handle(Object(Illuminate\\Http\\Request))
#55 {main}
"}