AWS, Centos 7 and file caching

I've got CakePHP 2.6.2 installed on Centos 7 on an AWS EC2 instance. The default user ('centos'), which I have set to run Apache as well as owning the files has full permissions over the tmp/* folders, yet I am getting the following error, which suggests that permissions are not set. Any clues please?

Warning: _cake_core_ cache was unable to write 'cake_dev_en-gb' to File cache in /var/www/site/lib/Cake/Cache/Cache.php on line 328

Warning: /var/www/site/app/tmp/cache/persistent/ is not writable in /var/www/site/lib/Cake/Cache/Engine/FileEngine.php on line 385

Fatal error: Uncaught exception 'CacheException' with message 'Cache engine "_cake_core_" is not properly configured. Ensure required extensions are installed, and credentials/permissions are correct' in /var/www/site/lib/Cake/Cache/Cache.php:186 Stack trace: #0 /var/www/site/lib/Cake/Cache/Cache.php(151): Cache::_buildEngine('_cake_core_') #1 /var/www/site/app/Config/core.php(374): Cache::config('_cake_core_', Array) #2 /var/www/site/lib/Cake/Core/Configure.php(72): include('/var/www/doxdir...') #3 /var/www/site/lib/Cake/bootstrap.php(175): Configure::bootstrap(true) #4 /var/www/site/app/webroot/index.php(90): include('/var/www/doxdir...') #5 {main} thrown in /var/www/site/lib/Cake/Cache/Cache.php on line 186

My cache configuration (in core.php) is:

$engine = 'File';

// In development mode, caches should expire quickly.

$duration = '+999 days';

if (Configure::read('debug') > 0) {

$duration = '+10 seconds';

}

// Prefix each application on the same server with a different string, to avoid Memcache and APC conflicts.

$prefix = 'dox_';

/**

 * Configure the cache used for general framework caching. Path information,

 * object listings, and translation cache files are stored with this configuration.

 */

Cache::config('_cake_core_', array(

'engine' => $engine,

'prefix' => $prefix . 'cake_core_',

'path' => CACHE . 'persistent' . DS,

'serialize' => ($engine === 'File'),

'duration' => $duration

));

/**

 * Configure the cache for model and datasource caches. This cache configuration

 * is used to store schema descriptions, and table listings in connections.

 */

Cache::config('_cake_model_', array(

'engine' => $engine,

'prefix' => $prefix . 'cake_model_',

'path' => CACHE . 'models' . DS,

'serialize' => ($engine === 'File'),

'duration' => $duration

));

Cache::config('quote_parameters', array(

'engine' => 'File',

'prefix' => $prefix,

'serialize' => ($engine === 'File'),

'duration' => '+1 week',

'probability' => 100,

'path' => CACHE . 'quote_parameters' . DS,

'groups' => array('order')

));

Cache::config('pace_codes', array(

'engine' => 'File',

'prefix' => $prefix,

'serialize' => ($engine === 'File'),

'duration' => '+1 week',

'probability' => 100,

'path' => CACHE . 'pace_codes' . DS,

'groups' => array('order')

));

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