Fatal error: Uncaught PDOException: SQLSTATE[08006] [7] connection to server at "pdb" (172.18.0.4), port 5432 failed: FATAL: sorry, too many clients already in /var/www/ac.dawidmo.info/ac_web/vendor/yiisoft/yii2/db/Connection.php:721 Stack trace: #0 /var/www/ac.dawidmo.info/ac_web/vendor/yiisoft/yii2/db/Connection.php(721): PDO->__construct('pgsql:host=pdb;...', 'postgres', Object(SensitiveParameterValue), NULL) #1 /var/www/ac.dawidmo.info/ac_web/vendor/yiisoft/yii2/db/Connection.php(636): yii\db\Connection->createPdoInstance() #2 /var/www/ac.dawidmo.info/ac_web/config/web.php(77): yii\db\Connection->open() #3 /var/www/ac.dawidmo.info/ac_web/web/index.php(155): require('/var/www/ac.daw...') #4 {main} Next yii\db\Exception: SQLSTATE[08006] [7] connection to server at "pdb" (172.18.0.4), port 5432 failed: FATAL: sorry, too many clients already in /var/www/ac.dawidmo.info/ac_web/vendor/yiisoft/yii2/db/Connection.php:647 Stack trace: #0 /var/www/ac.dawidmo.info/ac_web/config/web.php(77): yii\db\Connection->open() #1 /var/www/ac.dawidmo.info/ac_web/web/index.php(155): require('/var/www/ac.daw...') #2 {main} Additional Information: Array ( [0] => 08006 [1] => 7 [2] => connection to server at "pdb" (172.18.0.4), port 5432 failed: FATAL: sorry, too many clients already ) thrown in /var/www/ac.dawidmo.info/ac_web/vendor/yiisoft/yii2/db/Connection.php on line 647