如何通过SSH隧道将PHP / Codeigniter应用程序连接到远程MySQL数据库？

Question

I am refactoring a spaghetti code PHP application into the Codeigniter framework and the development version of the application is on a different server than the production database. For testing, I would like to establish an ssh tunnel from my EC2 instance where I am hosting the development version to the production database. I have successfully created an ssh connection with the remote server via libssh2 AND with phpseclib ( http://phpseclib.sourceforge.net/ ). However, after the ssh tunnel has been established, I am not able to connect to the database with the codeigniter mysqli db driver.

With every attempt to connect to the database, I get the following error:

Unable to connect to your database server using the provided settings. Filename: core/MY_Controller.php Line Number: 6

The MY_Controller code is:

1  <?php defined('BASEPATH') OR exit('No direct script access allowed');
2
3  class MY_Controller extends CI_Controller {
4 
5  public function __construct() {
6       parent::__construct();
7       $this->auth = new stdClass;
8       $this->load->library('flexi_auth');
9       if (!$this->flexi_auth->is_logged_in()) {
10          header('Location: /login');
11      }
12  }

I have modified the mysqli driver to include the tunnel object as a parameter in the mysqli real_connect function as follows, to no avail. Does anyone know how I can make this work?

Thank you in advance for any help!

Mike

Answer 1

I think my first attempt would be to create an ssh tunnel like this:

my_dev_ec2# ssh -L 3306:localhost:3306 myuser@my_production_ec2

And then config the mysqli db to connect to localhost as if it was in the production instance.