apc_shm_attach: shmat failed: in Unknown on line 0 & apc_shm_create: shmget(0, 67108864, 914) failed PHP Solution

PHP Fatal error:  PHP Startup: apc_shm_create: shmget(0, 67108864, 914) failed: Invalid argument. It is possible that the chosen SHM segment size is higher than the operation system allows. Linux has usually a default limit of 32MB per segment. in Unknown on line 0
PHP Fatal error:  PHP Startup: apc_shm_attach: shmat failed: in Unknown on line 0

This error is not at all fun because it actually prevents Apache/httpd from starting or working at all. It will die during restart

[root@phpbox stats]# service httpd status
httpd dead but subsys locked


Solution - Increase shmmax value in sysctl.conf to 256MB:

Edit /etc/sysctl.conf

kernel.shmmax  = 268435456



sysctl -p

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