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What is the difference between the open files setting in limits.conf and the fs.file-max value in /proc/sys/fs/file-max?

Solution Unverified - Updated 2014-12-09T00:10:52+00:00 -

Issue

What is the difference between the open files setting in limits.conf and the fs.file-max value in /proc/sys/fs/file-max?
How to set the value to configure the FD?

Environment

Red Hat Enterprise Linux (RHEL) 5

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