Fatal error: Uncaught PDOException: PDO::__construct(): php_network_getaddresses: getaddrinfo for {mysql_host} failed: Name or service not known in /www/wwwroot/gedamari/vendor/yiisoft/yii2/db/Connection.php:721 Stack trace: #0 /www/wwwroot/gedamari/vendor/yiisoft/yii2/db/Connection.php(721): PDO->__construct() #1 /www/wwwroot/gedamari/vendor/yiisoft/yii2/db/Connection.php(636): yii\db\Connection->createPdoInstance() #2 /www/wwwroot/gedamari/vendor/yiisoft/yii2/db/Connection.php(1066): yii\db\Connection->open() #3 /www/wwwroot/gedamari/vendor/yiisoft/yii2/db/Connection.php(1053): yii\db\Connection->getMasterPdo() #4 /www/wwwroot/gedamari/vendor/yiisoft/yii2/db/Command.php(261): yii\db\Connection->getSlavePdo() #5 /www/wwwroot/gedamari/vendor/yiisoft/yii2/db/Command.php(1181): yii\db\Command->prepare() #6 /www/wwwroot/gedamari/vendor/yiisoft/yii2/db/Command.php(417): yii\db\Command->queryInternal() #7 /www/wwwroot/gedamari/common/config/bootstrap.php(28): yii\db\Command->queryAll() #8 /www/wwwroot/gedamari/appfront/web/index.php(24): require('...') #9 {main} Next PDOException: SQLSTATE[HY000] [2002] php_network_getaddresses: getaddrinfo for {mysql_host} failed: Name or service not known in /www/wwwroot/gedamari/vendor/yiisoft/yii2/db/Connection.php:721 Stack trace: #0 /www/wwwroot/gedamari/vendor/yiisoft/yii2/db/Connection.php(721): PDO->__construct() #1 /www/wwwroot/gedamari/vendor/yiisoft/yii2/db/Connection.php(636): yii\db\Connection->createPdoInstance() #2 /www/wwwroot/gedamari/vendor/yiisoft/yii2/db/Connection.php(1066): yii\db\Connection->open() #3 /www/wwwroot/gedamari/vendor/yiisoft/yii2/db/Connection.php(1053): yii\db\Connection->getMasterPdo() #4 /www/wwwroot/gedamari/vendor/yiisoft/yii2/db/Command.php(261): yii\db\Connection->getSlavePdo() #5 /www/wwwroot/gedamari/vendor/yiisoft/yii2/db/Command.php(1181): yii\db\Command->prepare() #6 /www/wwwroot/gedamari/vendor/yiisoft/yii2/db/Command.php(417): yii\db\Command->queryInternal() #7 /www/wwwroot/gedamari/common/config/bootstrap.php(28): yii\db\Command->queryAll() #8 /www/wwwroot/gedamari/appfront/web/index.php(24): require('...') #9 {main} Next yii\db\Exception: SQLSTATE[HY000] [2002] php_network_getaddresses: getaddrinfo for {mysql_host} failed: Name or service not known in /www/wwwroot/gedamari/vendor/yiisoft/yii2/db/Connection.php:647 Stack trace: #0 /www/wwwroot/gedamari/vendor/yiisoft/yii2/db/Connection.php(1066): yii\db\Connection->open() #1 /www/wwwroot/gedamari/vendor/yiisoft/yii2/db/Connection.php(1053): yii\db\Connection->getMasterPdo() #2 /www/wwwroot/gedamari/vendor/yiisoft/yii2/db/Command.php(261): yii\db\Connection->getSlavePdo() #3 /www/wwwroot/gedamari/vendor/yiisoft/yii2/db/Command.php(1181): yii\db\Command->prepare() #4 /www/wwwroot/gedamari/vendor/yiisoft/yii2/db/Command.php(417): yii\db\Command->queryInternal() #5 /www/wwwroot/gedamari/common/config/bootstrap.php(28): yii\db\Command->queryAll() #6 /www/wwwroot/gedamari/appfront/web/index.php(24): require('...') #7 {main} Additional Information: Array ( [0] => HY000 [1] => 2002 [2] => php_network_getaddresses: getaddrinfo for {mysql_host} failed: Name or service not known ) thrown in /www/wwwroot/gedamari/vendor/yiisoft/yii2/db/Connection.php on line 647