Fatal error: Uncaught CodeIgniter\Database\Exceptions\DatabaseException: Unable to connect to the database. Main connection [MySQLi]: No route to host in /var/www/html/vendor/codeigniter4/framework/system/Database/BaseConnection.php:428 Stack trace: #0 /var/www/html/vendor/codeigniter4/framework/system/Session/Handlers/DatabaseHandler.php(98): CodeIgniter\Database\BaseConnection->initialize() #1 [internal function]: CodeIgniter\Session\Handlers\DatabaseHandler->open() #2 /var/www/html/vendor/codeigniter4/framework/system/Session/Session.php(919): session_start() #3 /var/www/html/vendor/codeigniter4/framework/system/Session/Session.php(241): CodeIgniter\Session\Session->startSession() #4 /var/www/html/vendor/codeigniter4/framework/system/Config/Services.php(693): CodeIgniter\Session\Session->start() #5 /var/www/html/vendor/codeigniter4/framework/system/Config/BaseService.php(258): CodeIgniter\Config\Services::session() #6 /var/www/html/vendor/codeigniter4/framework/system/Config/BaseService.php(199): CodeIgniter\Config\BaseService::__callStatic() #7 /var/www/html/vendor/codeigniter4/framework/system/Config/Services.php(664): CodeIgniter\Config\BaseService::getSharedInstance() #8 /var/www/html/vendor/codeigniter4/framework/system/Config/BaseService.php(258): CodeIgniter\Config\Services::session() #9 /var/www/html/vendor/codeigniter4/framework/system/Common.php(984): CodeIgniter\Config\BaseService::__callStatic() #10 /var/www/html/app/Config/Boot/development.php(34): session() #11 /var/www/html/vendor/codeigniter4/framework/system/CodeIgniter.php(596): require_once('...') #12 /var/www/html/vendor/codeigniter4/framework/system/CodeIgniter.php(207): CodeIgniter\CodeIgniter->bootstrapEnvironment() #13 /var/www/html/public/index.php(79): CodeIgniter\CodeIgniter->initialize() #14 {main} thrown in /var/www/html/vendor/codeigniter4/framework/system/Database/BaseConnection.php on line 428