Upload path on Codeigniter gives error in Openshift - php

I am trying to upload image to my Codeigniter application hosted on Openshift. My app structure is as follows
App
-libs
-...
-php
- application
- public
- uploads
I want to upload images to this uploads folder. my code
$config['upload_path']=realpath(dirname(__FILE__)).'public/uploads/';
$config['allowed_types']="jpg|jpeg|gif|png";
$this->load->library('upload',$config);
if(!($this->upload->do_upload())){
$error=array('error'=>$this->upload->display_errors());
$this->load->view('profile',$error);
}
else{
$file_data=$this->upload->data();
$data['img']=base_url().'/public/uploads/'.$file_data['file_name'];
$this->load->view('success',$data);
}
But above gives me The upload path does not appear to be valid. error. I have tried several ways. But the problem is the server do not allow to upload to the location.
Normally I can access the files in the uploads folder. But when I try to write data (store file) it doesn't allow. How can I fix this thing.
Note: I want the solution for the Openshift server but not the localhost


The path is supposed to be $OPENSHIFT_DATA_DIR (which points to ~/app_root/data).
You can also write to /tmp but those files will be treated as ephemeral.
You do not have write permissions anywhere in the file system.

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I have a PHP web-application that allows users to upload images to my web site. I'm doing this using a simply HTML <form enctype="multipart/form-data">
However, instead of having those images uploaded to my web server - I would to have those images uploaded directly to my CDN (Cachefly - which is another server).
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Sure.
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Post your code and I can help more.

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Documentation: http://doc.s3.amazonaws.com/proposals/post.html
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