Estou passando exatamente pelo mesmo problema!
1 [2019-09-04 13:50:26] request.INFO: Matched route "app_login".
{"route":"app_login","route_parameters":{"_route":"app_login","_controller":"App\\Controller\\SecurityController::login"},"request_uri":"http://192.168.0.175/login","method":"POST"}
[] [2019-09-04 13:50:26] security.DEBUG: Checking for guard authentication credentials. {"firewall_key":"main","authenticators":1} []
[2019-09-04 13:50:26] security.DEBUG: Checking support on guard authenticator.
{"firewall_key":"main","authenticator":"App\\Security\\LoginAuthenticator"} [] [2019-09-04 13:50:26] security.DEBUG: Calling getCredentials()
on guard authenticator. {"firewall_key":"main","authenticator":"App\\Security\\LoginAuthenticator"} [] [2019-09-04 13:50:26] security.DEBUG:
Passing guard token information to the GuardAuthenticationProvider
{"firewall_key":"main","authenticator":"App\\Security\\LoginAuthenticator"} [] [2019-09-04 13:50:26] request.CRITICAL: Uncaught PHP Exception
Doctrine\DBAL\Exception\ConnectionException: "An exception occurred in driver: SQLSTATE[HY000] [2002] No such file or directory" at
/var/www/html/novosga/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/AbstractMySQLDriver.php line 93 {"exception":"[object]
(Doctrine\\DBAL\\Exception\\ConnectionException(code: 0): An exception occurred in driver: SQLSTATE[HY000] [2002] No such file or directory
at /var/www/html/novosga/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/AbstractMySQLDriver.php:93, Doctrine\\DBAL\\Driver\\PDOException(code:
2002): SQLSTATE[HY000] [2002] No such file or directory at
/var/www/html/novosga/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOConnection.php:31, PDOException(code: 2002): SQLSTATE[HY000] [2002] No
such file or directory at /var/www/html/novosga/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOConnection.php:27)"} [] [2019-09-04
13:50:33] request.INFO: Matched route "app_login".
{"route":"app_login","route_parameters":{"_route":"app_login","_controller":"App\\Controller\\SecurityController::login"},"request_uri":"http://192.168.0.175/login","method":"POST"}
[] [2019-09-04 13:50:33] security.DEBUG: Checking for guard authentication credentials. {"firewall_key":"main","authenticators":1} []
[2019-09-04 13:50:33] security.DEBUG: Checking support on guard authenticator.
{"firewall_key":"main","authenticator":"App\\Security\\LoginAuthenticator"} [] [2019-09-04 13:50:33] security.DEBUG: Calling getCredentials()
on guard authenticator. {"firewall_key":"main","authenticator":"App\\Security\\LoginAuthenticator"} [] [2019-09-04 13:50:33] security.DEBUG:
Passing guard token information to the GuardAuthenticationProvider
{"firewall_key":"main","authenticator":"App\\Security\\LoginAuthenticator"} [] [2019-09-04 13:50:33] request.CRITICAL: Uncaught PHP Exception
Doctrine\DBAL\Exception\ConnectionException: "An exception occurred in driver: SQLSTATE[HY000] [2002] No such file or directory" at
/var/www/html/novosga/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/AbstractMySQLDriver.php line 93 {"exception":"[object]
(Doctrine\\DBAL\\Exception\\ConnectionException(code: 0): An exception occurred in driver: SQLSTATE[HY000] [2002] No such file or directory
at /var/www/html/novosga/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/AbstractMySQLDriver.php:93, Doctrine\\DBAL\\Driver\\PDOException(code:
2002): SQLSTATE[HY000] [2002] No such file or directory at
/var/www/html/novosga/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOConnection.php:31, PDOException(code: 2002): SQLSTATE[HY000] [2002] No
such file or directory at /var/www/html/novosga/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOConnection.php:27)"} []