I use Bitnami Magento Stack, for me this solution below was the best I have found.
I've tried to create a Mage_Shell_Class php file, but without success (invalid cache array were always empty when it runs, no matter what, and I really don't imagine why).
I've created a php file 'sample.php':
$invalid = Mage::app()->getCacheInstance()->getInvalidatedTypes();
foreach($invalid as $i)
I've placed it on magento root folder, and to start it I use a cronjob that runs under root user.
So, to create the cronjob on the root user:
sudo crontab -u root -e
And this was my command line to run it:
* * * * * . /opt/bitnami/scripts/setenv.sh ; /opt/bitnami/php/bin/php /opt/bitnami/apps/magento/htdocs/sample.php >> /var/log/cron/cron.log 2>&1
Some parts on this line are very particular to my problem:
- Since it just refreshes the invalidated caches I've decided to run it every minute.
- setenv.sh is a script that helps me to set the environment when dealing with this particular bitnami stack.
- To get the output of this script I used this last part ">> /var/log/cron/cron.log 2>&1" to output errors to a directory that I've created (/var/log/cron), and has given the correct permissions on it.
Probably you need to change the cron line command, but I think this will help you.