Fatal error: Uncaught PDOException: PDO::__construct(): php_network_getaddresses: getaddrinfo failed: Name or service not known in /usr/share/nginx/html/public/common.php:31 Stack trace: #0 /usr/share/nginx/html/public/common.php(31): PDO->__construct('mysql:host=stag...', 'url-shortener-s...', 'dXYs9L5s6CSjKXX...') #1 /usr/share/nginx/html/public/common.php(57): getDBConnection() #2 /usr/share/nginx/html/public/click.php(21): getShortUrl() #3 {main} Next PDOException: SQLSTATE[HY000] [2002] php_network_getaddresses: getaddrinfo failed: Name or service not known in /usr/share/nginx/html/public/common.php:31 Stack trace: #0 /usr/share/nginx/html/public/common.php(31): PDO->__construct('mysql:host=stag...', 'url-shortener-s...', 'dXYs9L5s6CSjKXX...') #1 /usr/share/nginx/html/public/common.php(57): getDBConnection() #2 /usr/share/nginx/html/public/click.php(21): getShortUrl() #3 {main} thrown in /usr/share/nginx/html/public/common.php on line 31