# cat /proc/sys/fs/file-max
8192
# echo 943718 > /proc/sys/fs/file-max
# cat /proc/sys/fs/file-max
943718
This value also can be changed using "sysctl" command. To make the change permanent, add the entries to /etc/sysctl.conf
# vi /etc/sysctl.conf
fs.file-max = 943718
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source:http://linuxpoison.blogspot.com/2008/08/13578175803582.html