In a VPS server, this usually occurs when VPS is running out of
resources especially RAM. By restarting the VPS you can fix the issue.
But it would be a temporary fix and it will only allow you to login to
the server, but cannot execute some of the commands.
Check for the failcnt value of privvmpages and kmemsize variables.
Due to the increase in failcnt, you are receiving the error “fork:Cannot
allocate memory”. Please check /proc/user_beancounters on vps for
checking the failcount.
$ cat /proc/user_beancounters
uid resource held maxheld barrier limit failcnt
privvmpages 33656 44989 96550 96550 106507
You can increase the limit by editing the following file in the main node.
$ /etc/sysconfig/vz-scripts/<ve-node>.conf
You can see the value as below
PRIVVMPAGES=”96550:96550″
Increase the value as you need and then restart the vps.
Another method to increase the limit is using command as follows:
$ vzctl set <ve_node> –privvmpages 12752512:12752512 –save
You will now be able to restart cpanel and it will be working fine.
