サーバー接続に失敗しました。object(PDOException)#5 (8) {
  ["message":protected]=>
  string(48) "SQLSTATE[HY000] [2002] No such file or directory"
  ["string":"Exception":private]=>
  string(0) ""
  ["code":protected]=>
  int(2002)
  ["file":protected]=>
  string(28) "/var/www/html/app/Lib/DB.php"
  ["line":protected]=>
  int(20)
  ["trace":"Exception":private]=>
  array(3) {
    [0]=>
    array(5) {
      ["file"]=>
      string(28) "/var/www/html/app/Lib/DB.php"
      ["line"]=>
      int(20)
      ["function"]=>
      string(11) "__construct"
      ["class"]=>
      string(3) "PDO"
      ["type"]=>
      string(2) "->"
    }
    [1]=>
    array(5) {
      ["file"]=>
      string(53) "/var/www/html/app/Domain/User/Service/UserService.php"
      ["line"]=>
      int(24)
      ["function"]=>
      string(8) "createDB"
      ["class"]=>
      string(10) "App\Lib\DB"
      ["type"]=>
      string(2) "::"
    }
    [2]=>
    array(5) {
      ["file"]=>
      string(23) "/var/www/html/index.php"
      ["line"]=>
      int(9)
      ["function"]=>
      string(11) "__construct"
      ["class"]=>
      string(35) "App\Domain\User\Service\UserService"
      ["type"]=>
      string(2) "->"
    }
  }
  ["previous":"Exception":private]=>
  NULL
  ["errorInfo"]=>
  array(3) {
    [0]=>
    string(5) "HY000"
    [1]=>
    int(2002)
    [2]=>
    string(25) "No such file or directory"
  }
}
<br>mysql:dbname=keizaidb;host=localhost;port=3306;charset=utf8;<br><br>10.0.16.15<br>