PHP: Fatal Error: Allowed Memory Size of X Bytes Exhausted

In case Ganglia's web page is unreachable while Apache is working, check Apache's error log for the following error:

PHP: Fatal Error: Allowed Memory Size of XXXXXX Bytes Exhausted

To solve this, we need to increase the size limit by using the following command:

## XXXM or -1 to set no limit at all.

sed -i 's/memory_limit.*/memory_limit = 512M/g' /etc/php.ini

OR

sed -i 's/memory_limit.*/memory_limit = -1/g' /etc/php.ini