Symptoms:

• You have the Apc cache engine turned on it Config/bootstrap.php and Config/core.php
• You are running php-fpm
• You run the cake console from the command line inside your app dir and you get the below error

// Config/bootstrap.php

// Setup a 'default' cache configuration for use in the application.
Cache::config('default', array('engine' => 'Apc'));

//Config/core.php
$engine = 'Apc';

Warning Error when Apc Cache is turned on and you run cake console

Warning Error: _cake_core_ cache was unable to write 'file_map' to Apc cache in [/home/user/cakephp-2.5.4/lib/Cake/Cache/Cache.php, line 323]

2014-09-25 15:46:22 Warning: _cake_core_ cache was unable to write 'file_map' to Apc cache in [/home/user/cakephp-2.5.4/lib/Cake/Cache/Cache.php, line 323]
Warning Error: _cake_core_ cache was unable to write 'object_map' to Apc cache in [/home/user/cakephp-2.5.4/lib/Cake/Cache/Cache.php, line 323]

2014-09-25 15:46:22 Warning: _cake_core_ cache was unable to write 'object_map' to Apc cache in [/home/user/cakephp-2.5.4/lib/Cake/Cache/Cache.php, line 323]

Resolution

Go into your php.ini apcu.ini settings and enable apcu for the php cli

On fedora 20 the configuraton settings for apcu are in /etc/php.d/apcu.ini

;	Setting this enables APCu for the CLI version of PHP
;	(Mostly for testing and debugging).
apc.enable_cli=1